Patent Publication Number: US-2022211346-A1

Title: Methods and apparatuses for displaying ultrasound displays on a foldable processing device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims the benefit under 35 U.S.C. § 119(e) of U.S. Patent App. Ser. No. 63/133,774, filed Jan. 4, 2021 under Attorney Docket No. B1348.70194US00, and entitled “METHODS AND APPARATUSES FOR DISPLAYING ULTRASOUND DISPLAYS ON A FOLDABLE PROCESSING DEVICE,” which is hereby incorporated by reference herein in its entirety. 
    
    
     FIELD 
     Generally, the aspects of the technology described herein relate to ultrasound displays. Certain aspects relate to displaying ultrasound displays on a foldable processing device. 
     BACKGROUND 
     Ultrasound devices may be used to perform diagnostic imaging and/or treatment, using sound waves with frequencies that are higher than those audible to humans. Ultrasound imaging may be used to see internal soft tissue body structures. When pulses of ultrasound are transmitted into tissue, sound waves of different amplitudes may be reflected back towards the probe at different tissue interfaces. These reflected sound waves may then be recorded and displayed as an image to the operator. The strength (amplitude) of the sound signal and the time it takes for the wave to travel through the body may provide information used to produce the ultrasound image. Many different types of images can be formed using ultrasound devices. For example, images can be generated that show two-dimensional cross-sections of tissue, blood flow, motion of tissue over time, the location of blood, the presence of specific molecules, the stiffness of tissue, or the anatomy of a three-dimensional region. 
     SUMMARY 
     According to an aspect of the present technology, a foldable processing device is provided, wherein: the foldable processing device comprises a first panel comprising a first display screen, a second panel comprising a second display screen; and one or more hinges. The first panel and the second panel are rotatably coupled by the one or more hinges. The foldable processing device is in operative communication with an ultrasound device. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Various aspects and embodiments will be described with reference to the following exemplary and non-limiting figures. It should be appreciated that the figures are not necessarily drawn to scale. Items appearing in multiple figures are indicated by the same or a similar reference number in all the figures in which they appear. 
         FIG. 1  illustrates a top view of a foldable processing device in an open configuration, in accordance with certain embodiments described herein. 
         FIG. 2  illustrates another top view of the foldable processing device of  FIG. 1  in the open configuration, in accordance with certain embodiments described herein. 
         FIG. 3  illustrates a side view of the foldable processing device of  FIG. 1  in a folded configuration, in accordance with certain embodiments described herein. 
         FIGS. 4 and 5  illustrate the foldable processing device of  FIG. 1  when operating in biplane imaging mode, in accordance with certain embodiments described herein. 
         FIGS. 6 and 7  illustrate the foldable processing device of  FIG. 1  when operating in pulsed wave Doppler mode, in accordance with certain embodiments described herein. 
         FIGS. 8 and 9  illustrate the foldable processing device of  FIG. 1  when operating in M-mode imaging, in accordance with certain embodiments described herein. 
         FIGS. 10 and 11  illustrate respective processes for using the foldable processing device of  FIG. 1  to display ultrasound displays, in accordance with certain embodiments described herein. 
         FIG. 12  illustrates the foldable processing device of  FIG. 1  when imaging the heart, in accordance with certain embodiments described herein. 
         FIGS. 13 and 14  illustrate respective processes for using the foldable processing device of  FIG. 1  to display ultrasound displays, in accordance with certain embodiments described herein. 
         FIGS. 15 and 16  illustrate respective processes for using the foldable processing device of  FIG. 1  to display ultrasound displays, in accordance with certain embodiments described herein. 
         FIG. 17  illustrates the foldable processing device of  FIG. 1  when performing ultrasound imaging, in accordance with certain embodiments described herein. 
         FIG. 18  illustrates the foldable processing device of  FIG. 1  when operating in a telemedicine mode, in accordance with certain embodiments described herein. 
         FIG. 19  illustrates the foldable processing device of  FIG. 1  when retrieving a saved ultrasound image or images, in accordance with certain embodiments described herein. 
         FIG. 20  illustrates a process for using the foldable processing device of  FIG. 1  to retrieve saved ultrasound image(s), in accordance with certain embodiments described herein. 
         FIG. 21  illustrates the foldable processing device of  FIG. 1  when imaging the heart, in accordance with certain embodiments described herein. 
         FIG. 22  illustrates the foldable processing device of  FIG. 1  when imaging the heart, in accordance with certain embodiments described herein. 
         FIG. 23  illustrates the foldable processing device of  FIG. 1  when performing ultrasound imaging and documentation, in accordance with certain embodiments described herein. 
         FIG. 24  illustrates a process for using the foldable processing device of  FIG. 1  to view ultrasound images in real-time and to freeze ultrasound images on a display screen, in accordance with certain embodiments described herein. 
         FIG. 25  illustrates a schematic block diagram of an example ultrasound system upon which various aspects of the technology described herein may be practiced. 
         FIG. 26  illustrates a top view of a foldable processing device in an open configuration, in accordance with certain embodiments described herein. 
         FIG. 27  illustrates another top view of the foldable processing device of  FIG. 26  in the open configuration, in accordance with certain embodiments described herein. 
         FIG. 28  illustrates a side view of the foldable processing device of  FIG. 26  in a folded configuration, in accordance with certain embodiments described herein. 
         FIG. 29  illustrates a schematic block diagram of an example ultrasound system upon which various aspects of the technology described herein may be practiced. 
     
    
    
     DETAILED DESCRIPTION 
     Recently, foldable processing devices, which may be, for example, mobile smartphones or tablets, have become available. Some foldable devices include two different display screens. In an open configuration, the two display screens are both visible to a user. The foldable processing device can fold into a compact closed configuration, which may be helpful for portability and storage, for example. Some foldable devices include one foldable display screen that can fold along a hinge, which may allow for a relatively large display screen when the device is open while also allowing for a relatively small form factor when the device is folded. Such foldable devices may be considered to have two display screen portions, one on each side of the hinge. 
     The inventors have recognized that the two display screens or the two display screen portions of a foldable processing device may be helpful for ultrasound imaging. Recently, ultrasound devices that are in operative communication (e.g., over a wired or wireless communication link) with processing devices such as mobile smartphones and tablets have become available. Certain ultrasound imaging modes may include two different displays. For example, biplane imaging may include simultaneous display of two types of ultrasound images, one along an azimuthal plane and one along an elevational plane. In biplane imaging mode, a foldable processing device in operative communication with an ultrasound device may be configured to simultaneously display ultrasound images along the azimuthal plane on one display screen or one display screen portion and ultrasound images along the elevational plane on the other display screen or the other display screen portion. As another example, pulsed wave Doppler imaging may include simultaneous display of ultrasound images and a velocity trace. In pulsed wave Doppler imaging mode, a foldable processing device in operative communication with an ultrasound device may be configured to display ultrasound images on one display screen or one display screen portion and a velocity trace on the other display screen or other display screen portion. As another example, M-mode imaging may include simultaneous display of ultrasound images and an M-mode trace. In M-mode, a foldable processing device in operative communication with an ultrasound device may be configured to display ultrasound images on one display screen or one display screen portion and an M-mode trace on the other display screen or other display screen portion. Compared with displaying two ultrasound displays on one display screen, displaying two ultrasound displays each on a different display screen of a foldable processing device may be helpful in that the displays may be larger and easier for a user to see and manipulate. Similarly, compared with displaying two ultrasound displays on one display screen of a non-foldable device, displaying two ultrasound displays each on one portion of a single foldable display screen may be helpful in that the displays may be larger and easier for a user to see and manipulate. 
     Additionally, the inventors have recognized that the two display screens or two display screen portions of a foldable processing device may be used for other aspects of ultrasound imaging as well. For example, one display screen or display screen portion may display an ultrasound image while the other display screen or display screen portion may display ultrasound imaging actions, a quality indicator, ultrasound imaging controls, a telemedicine interface, saved ultrasound images, 2D and 3D ultrasound image visualizations, and/or fillable documentation. 
     Various aspects of the present disclosure may be used alone, in combination, or in a variety of arrangements not explicit in the embodiments described in the foregoing and is therefore not limited in its application to the details and arrangement of components set forth in the foregoing description or illustrated in the drawings. For example, aspects described in one embodiment may be combined in any manner with aspects described in other embodiments. 
       FIG. 1  illustrates a top view of a foldable processing device  100  in an open configuration, in accordance with certain embodiments described herein. The foldable processing device  100  may be any type of processing device, such as a mobile smartphone or a tablet. The foldable processing device  100  includes a first panel  102   a , a second panel  102   b , a first hinge  106   a , and a second hinge  106   b . The first panel  102   a  includes a first display screen  104   a . The second panel  102   b  includes a second display screen  104   b . The first panel  102   a  and the second panel  102   b  are rotatably coupled by the first hinge  104  and the second hinge  106 .  FIG. 1  further illustrates an ultrasound device  124  and a cable  126 . The cable  126  extends between the ultrasound device  124  and the foldable processing device  100 . The foldable processing device  100  may be in operative communication with the ultrasound device  124 . Thus, the foldable processing device  100  may communicate with the ultrasound device  124  in order to control operation of the ultrasound device  124  and/or the ultrasound device  124  may communicate with the foldable processing device  100  in order to control operation of the foldable processing device  100 . The cable  126  may be, for example, an Ethernet cable, a Universal Serial Bus (USB) cable, or a Lightning cable, or any other type of communications cable, and may facilitate communication between the foldable processing device  100  and the ultrasound device  124  over a wired communication link. In some embodiments, the cable  126  may be absent, and the foldable processing device  100  and the ultrasound device  124  may communicate over a wireless communication link (e.g., over a BLUETOOTH, WiFi, or ZIGBEE wireless communication link). 
       FIG. 1  displays an open configuration for the foldable processing device  100  in which the first panel  102   a  and the second panel  102   b  are substantially coplanar, and the first display screen  104   a  and the second display screen  104   b  are visible to a user. The first hinge  106   a  and the second hinge  106   b  enable the first panel  102   a  and/or the second panel  102   b  to rotate about the first hinge  106   a  and the second hinge  106   b  such that the foldable processing device  100  goes from the open configuration to a folded configuration, as illustrated in  FIG. 3 . 
       FIG. 2  illustrates another top view of the foldable processing device  100  in the open configuration, in accordance with certain embodiments described herein. The foldable processing device  100  is illustrated rotated from the orientation in  FIG. 1 . In some embodiments, in response to rotation of the foldable processing device  100  from the orientation in  FIG. 1  to the orientation in  FIG. 2 , or vice versa, the foldable processing device  100  may cause the displays that are displayed on the first display screen  104   a  and/or the second display screen  104   b  to rotate as well. The configuration of  FIG. 1  may be referred to as portrait mode while the configuration of  FIG. 2  may be referred to as landscape mode. 
       FIG. 3  illustrates a side view of the foldable processing device  100  in a folded configuration, in accordance with certain embodiments described herein. In the folded configuration, the first display screen  104   a  and the second display screen  104   b  face each other, may be in contact with each other, and may not be visible to a user. The first panel  102   a  and the second panel  102   b  may be stacked one on top of another. The first hinge  106   a  and the second hinge  106   b  enable the first panel  102   a  and/or the second panel  102   b  to rotate about the first hinge  106   a  and the second hinge  106   b  such that the foldable processing device  100  goes from the folded configuration to the open configuration, as illustrated in  FIGS. 1 and 2 . The foldable processing device  100  may be more compact in the folded configuration than in the open configuration, while the open configuration may allow the first display screen  104   a  and the second display screen  104   b  to be visible. 
     While  FIGS. 1-3  illustrate two hinges  106   a  and  106   b , each at one end of the first panel  102   a  and the second panel  102   b , some embodiments may have fewer or more hinges, and/or the hinge(s) may be at different locations. Additionally, other means for coupling the first panel  102   a  and the second panel  102   b  together such that the foldable processing device  100  can go from an open configuration to a foldable configuration may be used. For example, the foldable processing device may be formed of a foldable sheet of continuous material, such as a flexible circuit. It should also be appreciated that the size and shape of the foldable processing device  100 , the first panel  102   a , the second panel  102   b , the first display screen  104   a , and the second display screen  104   b  as illustrated is non-limiting, and that the foldable processing device  100 , the first panel  102   a , the second panel  102   b , the first display screen  104   a , and the second display screen  104   b  may have different sizes and/or shapes than illustrated. 
       FIGS. 4-9  illustrate the foldable processing device  100  when operating in certain ultrasound imaging modes. Generally, the ultrasound imaging modes may include displaying at least two different displays. The foldable processing device  100  may be configured to display one of the displays related to the ultrasound imaging mode on the first display screen  104   a  and to display another of the displays related to the ultrasound imaging mode on the second display screen  104   b . The foldable processing device  100  may display these two displays simultaneously. In some embodiments, the foldable processing device  100  may be configured to display these two displays related to the ultrasound imaging mode based on receiving a selection from a user (e.g., from a menu of options displayed on either or both of the first display screen  104   a  and the second display screen  104   b ) to operate in this ultrasound imaging mode. In some embodiments, the foldable processing device  100  may be configured to display these two displays related to the ultrasound imaging mode based on an automatic selection by the foldable processing device  100  (e.g., as part of an automatic workflow) to operate in this ultrasound imaging mode. 
       FIGS. 4 and 5  illustrate the foldable processing device  100  when operating in biplane imaging mode, in accordance with certain embodiments described herein. The first display screen  104   a  displays an ultrasound image along the elevational plane  408  and the second display screen  104   b  displays an ultrasound image along the azimuthal plane  410 . The foldable processing device  100  may display the ultrasound image along the elevational plane  408  and the ultrasound image along the azimuthal plane  410  simultaneously. 
     The ultrasound device  124  with which the foldable processing device  100  is in operative communication, and specifically the ultrasound transducer array of the ultrasound device  124 , may include an azimuthal dimension and an elevational dimension. The azimuthal dimension may be the dimension of the ultrasound transducer array that has more ultrasound transducers than the other dimension, which may be the elevational dimension. In some embodiments of biplane imaging mode, the foldable processing device  100  may configure the ultrasound device  124  to alternate collection of ultrasound images along the elevational plane  408  and collection of ultrasound images along the azimuthal plane  410 . The ultrasound device  124  may collect the ultrasound images along the azimuthal plane  410  by transmitting and/or receiving ultrasound waves using an aperture (in other words, a subset of the ultrasound transducers) having a long dimension along the azimuthal dimension of the ultrasound transducer array of the ultrasound device  124 . The ultrasound device  124  may collect the ultrasound images along the elevational plane  408  by transmitting and/or receiving ultrasound waves using an aperture having a long dimension along the elevational dimension of the ultrasound transducer array of the ultrasound device  124 . Thus, alternating collection of the ultrasound images along the elevational plane  408  and collection of ultrasound images along the azimuthal plane  410  may include alternating collection of ultrasound images using one aperture and collection of ultrasound images using another aperture. In some embodiments, alternating collection of the ultrasound images along the elevational plane  408  and collection of the ultrasound images along the azimuthal plane  410  may include using the same aperture but with different beamforming parameters. Thus, alternating collection of the ultrasound images along the elevational plane  408  and collection of ultrasound images along the azimuthal plane  410  may include alternating generation of ultrasound images using one set of beamforming parameters and generation of ultrasound images using another set of beamforming parameters. The ultrasound device  124  may collect both types of ultrasound images without a user needing to rotate the ultrasound device  124 . 
     In some embodiments, alternating collection of the ultrasound images may be at a rate in the range of approximately 15-30 Hz. In some embodiments, alternating collection of the ultrasound images may include collecting one ultrasound image along the elevational plane  408 , then collecting one ultrasound image along the azimuthal plane  410 , then collecting one ultrasound image along the elevational plane  408 , etc. In some embodiments, alternating collection of the ultrasound images may include collecting one or more ultrasound images along the azimuthal plane  410 , then collecting one or more ultrasound images along the elevational plane  408 , then collecting one or more ultrasound images along the azimuthal plane  410 , etc. In some embodiments, the foldable processing device  100  may be configured to receive each ultrasound image along the elevational plane  408  from the ultrasound device  124  and display it on the first display screen  104   a  (replacing the previously-displayed image on the first display screen  104   a ), and receive each ultrasound image along the azimuthal plane  410  from the ultrasound device  124  and display it on the second display screen  104   b  (replacing the previously-displayed image on the second display screen  104   b ). In some embodiments, the foldable processing device  100  may be configured to receive data for generating the ultrasound image along the elevational plane  408  from the ultrasound device  124 , generate the ultrasound image along the elevational plane  408  from the data, and display it on the first display screen  104   a  (replacing the previously-displayed image on the first display screen  104   a ); the foldable processing device  100  may be configured to receive data for generating the ultrasound image along the azimuthal plane  410  from the ultrasound device  124 , generate the ultrasound image along the azimuthal plane  410  from the data, and display it on the second display screen  104   b  (replacing the previously-displayed image on the second display screen  104   b ). In other words, the foldable processing device  100  may be configured to display a particular ultrasound image along the elevational plane  408  on the first display screen  104   a  until a new ultrasound image along the elevational plane  408  has been collected, and then display the newly collected ultrasound image along the elevational plane  408  instead of the previously collected ultrasound image along the elevational plane  408  on the first display screen  104   a . The foldable processing device  100  may be configured to display a particular ultrasound image along the azimuthal plane  410  on the second display screen  104   b  until a new ultrasound image along the azimuthal plane  410  has been collected, and then display the newly collected ultrasound image along the azimuthal plane  410  instead of the previously collected ultrasound image along the azimuthal plane  410  on the second display screen  104   b . In the example embodiments of  FIG. 4 , the ultrasound image along the elevational plane  408  and the ultrasound image along the azimuthal plane  410  contain certain orientation indicators, although certain embodiments may not include these orientation indicators. Further description of such orientation indicators and biplane imaging in general may be found in U.S. patent application Ser. No. 17/137,787 titled “METHODS AND APPARATUSES FOR MODIFYING THE LOCATION OF AN ULTRASOUND IMAGING PLANE,” filed on Dec. 30, 2020 and published as U.S. Pat. Pub. No. US 2021/0196237 A1 (and assigned to the assignee of the instant application), which is incorporated by reference herein in its entirety. 
     In some embodiments, the foldable processing device  100  may be configured to display the ultrasound image along the elevational plane  408  on the first display screen  104   a  and the ultrasound image along the azimuthal plane  410  on the second display screen  104   b  based on receiving a selection from a user (e.g., from a menu of options displayed on either or both of the first display screen  104   a  and the second display screen  104   b ) to operate in biplane imaging mode. In some embodiments, the foldable processing device  100  may be configured to display the ultrasound image along the elevational plane  408  on the first display screen  104   a  and the ultrasound image along the azimuthal plane  410  on the second display screen  104   b  based on an automatic selection by the foldable processing device  100  (e.g., as part of an automatic workflow) to operate in biplane imaging mode. 
       FIG. 4  illustrates the ultrasound image along the elevational plane  408  and the ultrasound image along the azimuthal plane  410  in portrait mode.  FIG. 5  illustrates the ultrasound image along the elevational plane  408  and the ultrasound image along the azimuthal plane  410  in landscape mode. While the example embodiment of  FIG. 4  illustrates the ultrasound image along the elevational plane  408  on the first display screen  104   a  and the ultrasound image along the azimuthal plane  410  on the second display screen  104   b , in some embodiments the foldable processing device  100  may be configured to display the ultrasound image along the elevational plane  408  on the second display screen  104   b  and the ultrasound image along the azimuthal plane  410  on the first display screen  104   a . While the example embodiment of  FIG. 4  illustrates the ultrasound image along the elevational plane  408  on the left and the ultrasound image along the azimuthal plane  410  on the right, in some embodiments the foldable processing device  100  may be configured to display the ultrasound image along the elevational plane  408  on the right and the ultrasound image along the azimuthal plane  410  on the left. While the example embodiment of  FIG. 5  illustrates the ultrasound image along the elevational plane  408  on the top and the ultrasound image along the azimuthal plane  410  on the bottom, in some embodiments the foldable processing device  100  may be configured to display the ultrasound image along the elevational plane  408  on the bottom and the ultrasound image along the azimuthal plane  410  on the top. It should also be appreciated that the foldable processing device  100  may display other items (e.g., control buttons and/or indicators) not illustrated in  FIG. 4 or 5  on the first display screen  104   a  and/or the second display screen  104   b.    
     Generally, in any of the figures herein, while the figure may illustrate an embodiment in which the foldable processing device  100  displays certain displays in portrait mode, in some embodiments the foldable processing device  100  may display the displays in landscape mode. While the figure may illustrate an embodiment in which the foldable processing device  100  displays certain displays in landscape mode, in some embodiments the foldable processing device  100  may display the displays in portrait mode. In any of the figures herein, while the figure may illustrate an embodiment in which a first display is on the first display screen  104   a  and a second display is on the second display screen  104   b , in some embodiments the first display may be on the second display screen  104   b  and the second display may be on the first display screen  104   a . In any of the figures herein, while the figure may illustrate an embodiment in which a first display is on the right and a second display is on the left, in some embodiments the first display may be on the left and the second display may be on the left. In any of the figures herein, while the figure may illustrate an embodiment in which a first display is on the top and a second display is on the bottom, in some embodiments the first display may be on the bottom and the second display may be on the top. In any of the figures herein, the foldable processing device  100  may display other items (e.g., control buttons and/or indicators) not illustrated in figure on the first display screen  104   a  and/or the second display screen  104   b.    
       FIGS. 6 and 7  illustrate the foldable processing device  100  when operating in pulsed wave Doppler mode, in accordance with certain embodiments described herein. The first display screen  104   a  displays an ultrasound image  608  and the second display screen  104   b  displays a velocity trace  610 . The foldable processing device  100  may display the ultrasound image  608  and the velocity trace  610  simultaneously. 
     In pulsed wave Doppler ultrasound imaging, ultrasound pulses may be directed at a particular portion of a subject in which something (e.g., blood) is flowing. This allows for measurement of the velocity of the flow. Generally, the parameters for pulse wave Doppler ultrasound imaging may include: 
     1. The portion of the subject where the flow velocity is to be measured, which may also be referred to as the sample volume; 
     2. The direction of the flow velocity to be measured. In other words, if flow occurs in an arbitrary direction, the component of the velocity of that flow along this particular selected direction may be the velocity measured; and 
     3. The direction in which the ultrasound pulses are transmitted from the ultrasound device  124 , and in particular, from the transducer array of the ultrasound device  124 , to the sample volume. 
     In the example embodiments of  FIGS. 6 and 7 , the above three parameters may be selected on the ultrasound image  608  that is displayed on the first display screen  104   a , although it should be appreciated that in some embodiments, one or more of these parameters may be automatically selected by foldable processing device  100  based on the other selected parameters. Selection of these parameters may be accomplished using various controls and/or indicators superimposed on the ultrasound image  608  that is displayed on the first display screen  104   a . The foldable processing device  100  may be configured to calculate the velocity through the selected sample direction and in the selected flow velocity direction for a particular ultrasound image  608 . When another ultrasound image is collected, the foldable processing device  100  may display the newly collected ultrasound image  608  instead of the previously collected ultrasound image  608  on the first display screen  104   a , and calculate the velocity for the newly collected ultrasound image  608 . Thus, the foldable processing device  100  may calculate velocities as a function of time, and display the velocities as the velocity trace  610  on the second display screen  104   b . Further description of selection of pulsed wave Doppler parameters and pulsed wave Doppler imaging in general may be found with reference to U.S. patent application Ser. No. 17/103,059 titled “METHODS AND APPARATUSES FOR PULSED WAVE DOPPLER ULTRASOUND IMAGING,” filed on Nov. 24, 2020 and published as U.S. Pat. Pub. No. US 2021/0153846 A1 (and assigned to the assignee of the instant application), which is incorporated by reference herein in its entirety. 
     In some embodiments, the foldable processing device  100  may be configured to display the ultrasound image  608  on the first display screen  104   a  and the velocity trace  610  on the second display screen  104   b  based on receiving a selection from a user (e.g., from a menu of options displayed on either or both of the first display screen  104   a  and the second display screen  104   b ) to operate in pulsed wave Doppler imaging mode. In some embodiments, the foldable processing device  100  may be configured to display the ultrasound image  608  on the first display screen  104   a  and the velocity trace  610  on the second display screen  104   b  based on an automatic selection by the foldable processing device  100  (e.g., as part of an automatic workflow) to operate in pulsed wave Doppler imaging mode. 
       FIGS. 8 and 9  illustrate the foldable processing device  100  when operating in M-mode imaging, in accordance with certain embodiments described herein. The first display screen  104   a  displays an ultrasound image  808  and the second display screen  104   b  displays an M-mode trace  810 . The foldable processing device  100  may display the ultrasound image  808  and the M-mode trace  810  simultaneously. 
     In M-mode, a user may select a line through an ultrasound image  808 . As each successive ultrasound image  808  is collected, the foldable processing device  100  may determine the portion of the ultrasound image  808  that is along the line and add it adjacent to the portion of the previous ultrasound image  808  that is along that line to form the M-mode trace  810 , which the foldable processing device  100  may display on the second display screen  104   b . In the example embodiments of  FIGS. 8 and 9 , the line through the ultrasound image  808  is selected on an ultrasound image  808  that is displayed on the first display screen  104   a . Selection of this parameter may be accomplished using various controls and/or indicators superimposed on the ultrasound image  808  that is displayed on the first display screen  104   a.    
     In some embodiments, the foldable processing device  100  may be configured to display the ultrasound image  808  on the first display screen  104   a  and the M-mode trace  810  on the second display screen  104   b  based on receiving a selection from a user (e.g., from a menu of options displayed on either or both of the first display screen  104   a  and the second display screen  104   b ) to operate in M-mode. In some embodiments, the foldable processing device  100  may be configured to display the ultrasound image  808  on the first display screen  104   a  and the M-mode trace  810  on the second display screen  104   b  based on an automatic selection by the foldable processing device  100  (e.g., as part of an automatic workflow) to operate in M-mode. 
       FIGS. 10 and 11  illustrate processes  1000  and  1100 , respectively, for using the foldable processing device  100  to display ultrasound displays, in accordance with certain embodiments described herein. The process  1000  begins at act  1002 . In act  1002 , the foldable processing device  100  receives a selection by a user to operate in an ultrasound imaging mode. In some embodiments, the foldable processing device  100  may receive the selection by the user from a menu of options displayed on either or both of the first display screen  104   a  and the second display screen  104   b . The ultrasound imaging mode may be, for example, biplane imaging mode, pulsed wave Doppler imaging mode, or M-mode imaging. The process  1000  proceeds from act  1002  to act  1004 . 
     In act  1004 , the foldable processing device  100  displays a first display related to the ultrasound imaging mode on the first display screen  104   a  of the foldable processing device  100  and a second display  104   b  related to the ultrasound imaging mode on the second display screen  104   b  of the foldable processing device  100 . For example, if the ultrasound imaging mode is biplane imaging mode, the first display may be an ultrasound image along the elevational plane (e.g., the ultrasound image along the elevational plane  408 ) and the second display may be an ultrasound image along the azimuthal plane (e.g., the ultrasound image along the azimuthal plane  410 ). Further description of biplane imaging mode may be found with reference to  FIGS. 4 and 5 . As another example, if the ultrasound imaging mode is pulsed wave Doppler imaging mode, the first display may be an ultrasound image (e.g., the ultrasound image  608 ) and the second display may be a velocity trace (e.g., the velocity trace  610 ). Further description of pulsed wave Doppler imaging mode may be found with reference to  FIGS. 6 and 7 . As another example, if the ultrasound imaging mode is M-mode imaging, the first display may be an ultrasound image (e.g., the ultrasound image  808 ) and the second display may be an M-mode trace (e.g., the M-mode trace  810 ). Further description of M-mode imaging may be found with reference to  FIGS. 8 and 9 . 
     The process  1100  begins at act  1102 . In act  1102 , the foldable processing device  100  automatically selects to operate in an ultrasound imaging mode. In some embodiments, the foldable processing device  100  may automatically select to operate in the ultrasound imaging mode as part of an automatic workflow. The ultrasound imaging mode may be, for example, biplane imaging mode, pulsed wave Doppler imaging mode, or M-mode imaging. The process  1100  proceeds from act  1102  to act  1104 . Act  1104  is the same as act  1004 . 
     While the above description has focused on biplane imaging mode, pulsed wave Doppler imaging mode, and M-mode image, these are non-limiting. In any ultrasound imaging mode that includes display of more than one display, the foldable processing device  100  may display one of the displays on the first display screen  104   a  and another display on the second display screen  104   b.    
     The foldable processing device  100  may be configured to display an ultrasound image on the first display screen  104   a  and to display ultrasound imaging actions related to the anatomical portion being imaged on the second display screen  104   b  (or vice versa). The anatomical portion may be, for example, an anatomical region, structure, or feature. The foldable processing device  100  may display the ultrasound image and the ultrasound imaging actions simultaneously. In some embodiments, the foldable processing device  100  may be configured to display the ultrasound image and the ultrasound imaging actions related to the anatomical portion based on receiving a selection from a user (e.g., from a menu of options displayed on either or both of the first display screen  104   a  and the second display screen  104   b ) to image the anatomical portion. In some embodiments, the foldable processing device  100  may be configured to display the ultrasound image and the ultrasound imaging actions related to the anatomical portion based on an automatic selection by the foldable processing device  100  (e.g., as part of an automatic workflow) to image the anatomical portion. 
       FIG. 12  illustrates the foldable processing device  100  when imaging the heart, in accordance with certain embodiments described herein. The first display screen  104   a  displays an ultrasound image  1208  and the second display screen  104   b  displays actions related to ultrasound imaging of the heart  1210 . The ultrasound image  1208  may be the most recently displayed ultrasound image, and may be frozen on the display screen  104   a  or updated in real time as subsequent ultrasound images are collected. The actions related to ultrasound imaging of the heart  1210  include actions that, when selected by the user from the second display screen  104   b , cause the foldable processing device  100  to perform actions related to ultrasound imaging of the heart  1210 . As illustrated, such actions may include enabling a user to annotate the ultrasound image  1208  with annotations specific to the heart, to be guided by the foldable processing device  100  to collect an ultrasound image of the heart, to cause the foldable processing device  100  to automatically perform a calculation related to the heart (e.g., calculating ejection fraction), and to view videos related to ultrasound imaging of the heart. It should be appreciated that the actions related to ultrasound imaging of the heart  1210  described above are non-limiting, and other actions may be included, or certain actions may be absent. The foldable processing device  100  may display the ultrasound image  1208  and the actions related to ultrasound imaging of the heart  1210  simultaneously. 
     In some embodiments, the foldable processing device  100  may be configured to display the ultrasound image  1208  on the first display screen  104   a  and the actions related to ultrasound imaging of the heart  1210  on the second display screen  104   b  based on receiving a selection from a user (e.g., from a menu of options displayed on either or both of the first display screen  104   a  and the second display screen  104   b ) to image the heart. Such selection may cause the foldable processing device  100  to configure the ultrasound device  124  with predetermined imaging parameters (which may be referred to as a preset) optimized for imaging the heart. In some embodiments, the foldable processing device  100  may be configured to display the ultrasound image  1208  on the first display screen  104   a  and the actions related to ultrasound imaging of the heart  1210  on the second display screen  104   b  based on an automatic selection by the foldable processing device  100  (e.g., as part of an automatic workflow) to image the heart. 
     While the above description has focused on actions related to ultrasound imaging of the heart, it should be appreciated that this application is not limited to the heart, and foldable processing device  100  may display actions related to ultrasound imaging of other anatomical portions. For example, for imaging the lungs, the foldable processing device  100  may display actions for enabling a user to annotate an ultrasound image with annotations specific to the lungs, to be guided by the foldable processing device  100  to collect an ultrasound image of the lungs, to cause the foldable processing device  100  to automatically perform a calculation related to the lungs (e.g., counting B-lines), and to view videos related to ultrasound imaging of the lungs. As another example, for imaging the bladder, the foldable processing device  100  may display actions for enabling a user to annotate an ultrasound image with annotations specific to the bladder, to be guided by the foldable processing device  100  to collect an ultrasound image of the bladder, to cause the foldable processing device  100  to automatically perform a calculation related to the bladder (e.g., calculating bladder volume), and to view videos related to ultrasound imaging of the bladder. 
     As another example, for obstetric imaging, the foldable processing device  100  may display actions for enabling a user to annotate an ultrasound image with annotations specific to obstetrics, to be guided by the foldable processing device  100  to collect an ultrasound image of a fetus, to cause the foldable processing device  100  to automatically perform a calculation related to obstetrics (e.g., calculating gestational age, estimated delivery date, fetal weight, or amniotic fluid index), and to view videos related to ultrasound imaging of fetuses. 
       FIGS. 13 and 14  illustrate processes  1300  and  1400 , respectively, for using a foldable processing device  100  to display ultrasound displays, in accordance with certain embodiments described herein. The process  1300  begins at act  1302 . In act  1302 , the foldable processing device  100  receives a selection by a user to image a particular anatomical portion (e.g., an anatomical region, structure, or feature). Such selection may cause the foldable processing device  100  to configure the ultrasound device  124  with predetermined imaging parameters (which may be referred to as a preset) optimized for imaging the anatomical portion. In some embodiments, the foldable processing device  100  may receive the selection by the user from a menu of options displayed on either or both of the first display screen  104   a  and the second display screen  104   b . The process  1300  proceeds from act  1302  to act  1304 . 
     In act  1304 , the foldable processing device  100  displays an ultrasound image (e.g., the ultrasound image  1208 ) on the first display screen  104   a  of the foldable processing device  100  and actions related to ultrasound imaging of the particular anatomical portion (e.g., the actions related to ultrasound imaging of the heart  1210 ) on the second display screen  104   b  of the foldable processing device  100 . For example, the actions may include (but are not limited to) actions performed by the foldable processing device  100  that enable a user to annotate an ultrasound image with annotations specific to the particular anatomical portion, to be guided by the foldable processing device  100  to collect an ultrasound image of the particular anatomical portion, to cause the foldable processing device  100  to automatically perform a calculation related to the particular anatomical portion (e.g., calculation of ejection fraction for ultrasound imaging of the heart, counting of B-lines for ultrasound imaging of the lungs, calculation of bladder volume for ultrasound imaging of the bladder, or calculation of gestational age, estimated delivery date, fetal weight, or amniotic fluid index for obstetric imaging), and to view videos related to ultrasound imaging of the particular anatomical portion. 
     The process  1400  begins at act  1402 . In act  1402 , the foldable processing device  100  automatically selects to image a particular anatomical portion (e.g., an anatomical region, structure, or feature). Such selection may cause the foldable processing device  100  to configure the ultrasound device  124  with predetermined imaging parameters (which may be referred to as a preset) optimized for imaging the anatomical region. In some embodiments, the foldable processing device  100  may automatically select to image the particular anatomical portion as part of an automatic workflow. The process  1400  proceeds from act  1402  to act  1404 . Act  1404  is the same as act  1304 . 
     The foldable processing device  100  may be configured to display an ultrasound image on the first display screen  104   a  and to display an ultrasound image quality indicator related to the anatomical portion being imaged on the second display screen  104   b  (or vice versa). The anatomical portion may be, for example, an anatomical region, structure, or feature. The foldable processing device  100  may display the ultrasound image and the ultrasound image quality indicator simultaneously. In some embodiments, the foldable processing device  100  may be configured to display the ultrasound image and the ultrasound image quality indicator related to the anatomical portion based on receiving a selection from a user (e.g., from a menu of options displayed on either or both of the first display screen  104   a  and the second display screen  104   b ) to image the anatomical portion. In some embodiments, the foldable processing device  100  may be configured to display the ultrasound image and the ultrasound imaging actions related to the anatomical portion based on an automatic selection by the foldable processing device  100  (e.g., as part of an automatic workflow) image the anatomical portion. 
       FIGS. 15 and 16  illustrate processes  1500  and  1600 , respectively, for using a foldable processing device  100  to display ultrasound displays, in accordance with certain embodiments described herein. The process  1500  begins at act  1502 , which is the same as act  1502 . The process  1500  proceeds from act  1502  to act  1504 . In act  1504 , the foldable processing device  100  displays an ultrasound image (e.g., the ultrasound image  2208 ) on the first display screen  104   a  of the foldable processing device  100  and a quality indicator (e.g., the quality indicator  2212 ) related to the particular anatomical portion for the ultrasound image on the second display screen  104   b  of the foldable processing device  100 . In some embodiments, the quality of the ultrasound image as indicated by the quality indicator may be based, at least in part, on a prediction of what proportion of experts (e.g., experts in the field of medicine, experts in a particular field of medicine, experts in ultrasound imaging, etc.) would consider the ultrasound image clinically usable as an ultrasound image of the particular anatomical region. In some embodiments, to determine the quality as indicated by the quality indicator, the foldable processing device  100  may use a statistical model trained to output such a prediction based on inputted ultrasound images. The quality indicator may be specific to ultrasound imaging of the particular anatomical portion in that it may indicate a low quality for ultrasound images of other anatomical portions despite such ultrasound images being high quality otherwise. This may be due to the statistical model being specifically trained to recognize ultrasound images of the particular anatomical region as high quality. The quality indicator may specifically indicate high qualities for ultrasound images predicted to be usable for certain purposes related to ultrasound imaging of the particular anatomical portion (e.g., calculation of ejection fraction for ultrasound imaging of the heart, counting of B-lines for ultrasound imaging of the lungs, or calculation of bladder volume for ultrasound imaging of the bladder). The quality indicator may indicate the quality textually, graphically, or both. 
     The process  1600  begins at act  1602 , which is the same as act  1402 . The process  1600  proceeds from act  1602  to act  1604 , which is the same as act  1504 . 
       FIG. 17  illustrates the foldable processing device  100  when performing ultrasound imaging, in accordance with certain embodiments described herein. The first display screen  104   a  displays an ultrasound image  1708  and the second display screen  104   b  displays ultrasound imaging controls  1714 . The ultrasound image  1708  may be the most recently displayed ultrasound image, and may be frozen on the display screen  104   a  or updated in real time as subsequent ultrasound images are collected.  FIG. 17  generally indicates ultrasound imaging controls  1714 , which may be used for ultrasound imaging for imaging of any anatomical portion and/or in any ultrasound imaging mode, but does not illustrate any specific ultrasound imaging controls. It should be appreciated that such ultrasound imaging controls may include, but are not limited to, controls for freezing the ultrasound image  1708 , capturing the ultrasound image  1708  as a still image, recording ultrasound clips, adjusting gain, adjusting depth, adjusting time gain compensation (TGC), selecting the anatomical portion to be imaged (which may include selecting predetermined ultrasound imaging parameters optimized for imaging the anatomical portion, which may be referred to as a preset), selecting the ultrasound imaging mode, adding annotations to the ultrasound image  1708 , and/or performing measurements on the ultrasound image  1708  (e.g., linear measurements or area measurements). It should be appreciated that the ultrasound imaging controls  1714  may include any of the controls described above, or other ultrasound imaging controls not specifically described. 
       FIG. 18  illustrates the foldable processing device  100  when operating in a telemedicine mode, in accordance with certain embodiments described herein. Telemedicine may include a real-time call between a user (who is using the foldable processing device  100  and the ultrasound device  124 ) and a remote guide, in which the remote guide may help the user to use the ultrasound device  124  capture an ultrasound image from a subject  1828 . The first display screen  104   a  displays an ultrasound image  1808  and the second display screen  104   b  displays a subject image  1816 , a remote guide image  1818 , and telemedicine controls  1820 . The ultrasound image  1808  may be the most recently displayed ultrasound image, and may be frozen on the display screen  104   a  or updated in real time as subsequent ultrasound images are collected. The subject image  1816 , the remote guide image  1818 , and the telemedicine controls  1820  may together be considered a telemedicine interface, or a portion thereof. The subject image  1816  shows the subject  1828  being imaged, the ultrasound device  124 , and an instruction  1826  for moving the ultrasound device  124  (although in some embodiments, one or more of these may be absent). The subject image  1816  may be a frame of a video captured by a camera of the foldable processing device  100 . The ultrasound image  1808  may have been captured by the ultrasound device  124  shown in the subject image  1816  and from the subject  1828  shown in the subject image  1816 . The remote guide image  1818  may be an image of the remote guide. The remote guide may transmit to the foldable processing device the instruction  1826  that is shown in the subject image  1816  to guide the user to capture an ultrasound image. The instruction  1826  may be, for example, an instruction to translate, rotate, or tilt the ultrasound device  124 . The telemedicine controls  1820  include controls for changing the size of the subject image  1816 , changing the orientation of the subject image  1816 , muting a microphone on the foldable processing device  100 , and ending the call with the remote guide, but in some embodiments, more or fewer of these controls may be present. Additionally, in some embodiments, one or more of the subject image  1816 , the remote guide image  1818 , and the telemedicine controls  1820  may be absent. Further description of telemedicine may be found in U.S. patent application Ser. No. 16/285,573, published as U.S. Patent Publication No. 2019/0261957 A1 and titled “METHODS AND APPARATUSES FOR TELE-MEDICINE,” filed on Feb. 26, 2019 (and assigned to the assignee of the instant application), which is incorporated by reference herein in its entirety; and U.S. patent application Ser. No. 16/735,019, published as U.S. Patent Publication No. 2020/0214682 A1 and titled “METHODS AND APPARATUSES FOR TELE-MEDICINE,” filed on Jan. 6, 2020 (and assigned to the assignee of the instant application), which is incorporated by reference herein in its entirety. 
     While  FIG. 18  illustrates the ultrasound image  1808  on the first display screen  104   a , in some embodiments the ultrasound image  1808  may be on the second display screen  104   b . While  FIG. 18  illustrates the subject image  1816  on the second display screen  104   b , in some embodiments the subject image  1816  may be on the first display screen  104   a . While  FIG. 18  illustrates the remote guide image  1818  on the second display screen  104   b , in some embodiments the remote guide image  1818  may be on the first display screen  104   a . While  FIG. 18  illustrates the telemedicine controls  1820  on the second display screen  104   b , in some embodiments the telemedicine controls  1820  may be on the first display screen  104   a.    
       FIG. 19  illustrates the foldable processing device  100  when retrieving a saved ultrasound image or images, in accordance with certain embodiments described herein. The first display screen  104   a  displays an ultrasound image or images  1908  and the second display screen  104   b  displays a set of saved ultrasound images  1922 . Each element of the set may be one ultrasound image or a clip of multiple ultrasound images. The set of saved ultrasound images  1922  includes the ultrasound image(s)  1908 . In  FIG. 19 , each ultrasound image or clip of ultrasound images is displayed as a thumbnail, although in some embodiments they may be displayed in other manners, such as a list of titles of ultrasound images or clips. A user of the ultrasound device  124  may have captured multiple ultrasound images or clips and saved them to memory (e.g., on the foldable processing device  100  or on an external server), and these ultrasound images may be displayed as the set of saved ultrasound images  1922  for subsequent retrieval by the user and display on the first display screen  104   a  of the foldable processing device  100 . Thus, upon receiving a selection from the user of one of the ultrasound images or one of the clips from the set of saved ultrasound images  1922  from the second display screen  104   b  (e.g., by the user touching or clicking on one of the thumbnails), the foldable processing device  100  may display the selected ultrasound image(s)  1908  on the first display screen  104   a , as illustrated in  FIG. 20 . The display of the selected ultrasound image(s)  1908  on the first display screen  104   a  may be at a larger size than the size at which the selected ultrasound image(s)  1908  were displayed in the set of saved ultrasound images  1922  on the second display screen  104   b  (e.g., larger than a thumbnail). If the selected ultrasound image(s)  1908  are in the form of a clip, the foldable processing device  100  may play the clip. 
       FIG. 20  illustrates a process  2000  for using a foldable processing device  100  to retrieve saved ultrasound image(s), in accordance with certain embodiments described herein. 
     The process  2000  begins at act  2002 . In act  2002 , the foldable processing device  100  displays a set of saved ultrasound images (e.g., the saved ultrasound images  1922 ) on the second display screen  104   b  of the foldable processing device  100 . Each element of the set may be one ultrasound image or a clip of multiple ultrasound images. Each ultrasound image or clip of ultrasound images in the set may be displayed, for example, as a thumbnail, or as a title in a list. A user of the ultrasound device  124  may have captured multiple ultrasound images or clips and saved them to memory (e.g., on the foldable processing device  100  or on an external server), and these ultrasound images may be displayed as the set of saved ultrasound images for subsequent retrieval by the user and display on the first display screen  104   a  of the foldable processing device  100 . The process  2000  proceeds from act  2002  to act  2004 . 
     In act  2004 , the foldable processing device  100  receives a selection by a user of an ultrasound image or image(s) from the set of saved ultrasound images on the second display screen. For example, if the set is displayed as thumbnails, then the user may touch or click on one of the thumbnails. The process  2000  proceeds from act  2004  to act  2006 . 
     In act  2006 , the foldable processing device  100  displays the selected ultrasound image or image(s) (i.e., selected in act  2004 ) on the first display screen  104   a . The display of the selected ultrasound image(s) on the first display screen  104   a  may be at a larger size than the size at which the selected ultrasound image(s) were displayed in the set of saved ultrasound images on the second display screen  104   b  (e.g., larger than a thumbnail). If the selected ultrasound image(s) are in the form of a clip, the foldable processing device  100  may play the clip. 
       FIG. 21  illustrates the foldable processing device  100  when imaging the heart, in accordance with certain embodiments described herein. The first display screen  104   a  displays an ultrasound image  2108  and the second display screen  104   b  displays a quality indicator  2112  indicating a quality of the ultrasound image  2108 . The ultrasound image  2108  may be the most recently displayed ultrasound image, and may be frozen on the display screen  104   a  or updated in real time as subsequent ultrasound images are collected. In some embodiments, the quality of the ultrasound image  2108  as indicated by the quality indicator  2112  may be based, at least in part, on a prediction of what proportion of experts (e.g., experts in the field of medicine, experts in a particular field of medicine, experts in ultrasound imaging, etc.) would consider the ultrasound image  2108  clinically usable as an ultrasound image of the heart. In some embodiments, to determine the quality as indicated by the quality indicator  2112 , the foldable processing device  100  may use a statistical model trained to output such a prediction based on inputted ultrasound images. The quality indicator  2112  may be specific to ultrasound imaging of the heart in that it may indicate a low quality for ultrasound images of other anatomical portions despite such ultrasound images being high quality otherwise. This may be due to the statistical model being specifically trained to recognize ultrasound images of the heart as high quality. The quality indicator  2112  may specifically indicate high qualities for ultrasound images predicted to be usable for certain purposes related to ultrasound imaging of the heart, such as for calculating ejection fraction. Further description of determining and the quality of an ultrasound image may be found in U.S. patent application Ser. No. 16/880,272 titled “METHODS AND APPARATUSES FOR ANALYZING IMAGING DATA,” filed on May 21, 2020 (and assigned to the assignee of the instant application) and published as U.S. Pat. Pub. No. US 2020/0372657 A1, which is incorporated by reference herein in its entirety. As illustrated in  FIG. 21 , the quality indicator  2112  may indicate the quality textually, graphically, or both. 
     In some embodiments, the foldable processing device  100  may be configured to display the ultrasound image  2108  on the first display screen  104   a  and the quality indicator  2112  on the second display screen  104   b  based on receiving a selection from a user (e.g., from a menu of options displayed on either or both of the first display screen  104   a  and the second display screen  104   b ) to image the heart. Such selection may cause the foldable processing device  100  to configure the ultrasound device  124  with predetermined imaging parameters (which may be referred to as a preset) optimized for imaging the heart. In some embodiments, the foldable processing device  100  may be configured to display the ultrasound image  2108  on the first display screen  104   a  and the quality indicator  2112  on the second display screen  104   b  based on an automatic selection by the foldable processing device  100  (e.g., as part of an automatic workflow) to image the heart. 
     While the above description has focused on a quality indicator for ultrasound images of the heart, it should be appreciated that this application is not limited to the heart, and the foldable processing device  100  may display quality indicators actions related to ultrasound imaging of other anatomical portions. For example, the foldable processing device  100  may display quality indicators indicating how clinically usable an ultrasound image is as an ultrasound image of the lungs, as an ultrasound image of the bladder, or as an ultrasound image of a fetus. Such quality indicators may specifically indicate high qualities for ultrasound images predicted to be usable for certain purposes related to ultrasound imaging of other anatomical portions, such as for counting B-lines in lung imaging, for calculating bladder volume in bladder imaging, or for calculating gestational age, estimated delivery date, fetal weight, or amniotic fluid index in obstetric imaging. 
     While  FIG. 21  illustrates the ultrasound image  2108  on the first display screen  104   a , in some embodiments the ultrasound image  2108  may be on the second display screen  104   b . While  FIG. 21  illustrates the quality indicator  2112  on the second display screen  104   b , in some embodiments the subject image quality indicator  2112  may be on the first display screen  104   a.    
       FIG. 22  illustrates the foldable processing device  100  when imaging the bladder, in accordance with certain embodiments described herein. The foldable processing device  100  may display imaging results of a 3D imaging sweep a bladder. The 3D sweep may be an elevational sweep. In other words, during the 3D sweep, the ultrasound device  124  may collect multiple ultrasound images, each ultrasound image collected along a different imaging slice at a different angle along the elevational dimension of the transducer array of the ultrasound device  124 . The ultrasound device  124  may use beamforming to focus an ultrasound beam along a different direction at each stage of the 3D sweep. The 3D sweep may be performed while the user maintains the ultrasound device  124  at a constant position and orientation. The ultrasound device  124  may use a two-dimensional array of ultrasound transducers on a chip to perform the three-dimensional ultrasound imaging sweep while the user maintains the ultrasound device at a constant position and orientation. The beamforming process may include applying different delays to the transmitted and received ultrasound waves/data from different portions of the ultrasound transducer array (e.g., different delays for different elevational rows, where a row refer to a sequence of elements at the same position on the short axis of the ultrasound transducer array). 
     The first display screen  104   a  displays 2D imaging results of the 3D imaging sweep. In particular, the first display screen  104   a  displays an ultrasound image  2208  that is a part of a cine, a segmented portion  2230 , a cine control/information bar  2232 , a measurement value indicator  2234 , and a bladder overlay option  2236 . The cine may display the ultrasound images collected during the 3D imaging sweep, one after another. For example, the cine may first display the ultrasound image collected at the first elevational angle used during the 3D imaging sweep, then display the ultrasound image collected at the second elevational angle used during the 3D imaging sweep, etc. In  FIG. 22 , one ultrasound image  2208  of the cine is displayed on the first display screen  104   a , but it should be appreciated that after a period of time the first display screen  104   a  may next display a next ultrasound image in the cine. 
     The cine control/information bar  2232  may control and provide information about the cine. For example, the cine control/information bar  2232  may provide information about how much time has elapsed during playback of the cine, how much time remains for playback of the cine, and may control playing, pausing, or changing to a different point in the cine. In some embodiments, the cine may play in a loop. 
     The segmented portion  2230  may represent the interior of the bladder as depicted in the ultrasound image  2208 . In some embodiments, the foldable processing device  100  may use a statistical model to generate the segmented portion  2230 . In particular, the statistical model may be trained to determine the location for segmented portions in ultrasound images. The bladder overlay option  2236  may toggle display of such segmented portions on or off. 
     The measurement value indicator  2234  may display a value for a measurement performed on the ultrasound images collected during the sweep. For example, the measurement may be a measurement of the volume of the bladder depicted in the ultrasound images collected during the sweep. In some embodiments, to perform a volume measurement, the foldable processing device  100  may calculate the area of the segmented portions (if any) in each ultrasound image collected during the sweep. The processing device may then calculate the average area of the segmented portions in each successive pair of ultrasound images in the 3D sweep (e.g., the average of the segmented portions in the first and second ultrasound images, the average of the segmented portions in second and third ultrasound images, etc.). The processing device may then multiply each averaged area by the angle (in radians) between each successive imaging slice in the 3D sweep to produce a volume, and sum all the volumes to produce the final volume value. It should be appreciated that other methods for performing measurements based on ultrasound images may be used, and other types of measurements may also be performed. 
     The second display screen  104   b  displays a 3D visualization  2240  that includes a first orientation indicator  2242 , and a second orientation indicator  2244 , a 3D bladder visualization  2246 , and a 3D environment visualization  2248 . The second display screen  104   b  further includes a bladder environment option  2250  and the measurement value indicator  2234 . The 3D visualization  2140  may be generated from the ultrasound images collected during the 3D sweep and segmented portions from the ultrasound images. The 3D bladder visualization  2246  may depict the 3D volume of the bladder and the 3D environment visualization  2248  may depict surrounding tissue in 3D. The bladder environment option  2250  may toggle display of the 3D environment visualization  2248  on or off. Thus, if the bladder environment option  2250  is set on, the 3D bladder visualization  2246  and the 3D environment visualization  2248  may be displayed, and if the bladder environment option  2250  is set off, the 3D bladder visualization  2246  but not the 3D environment visualization  2248  may be displayed. 
     In some embodiments, the first orientation indicator  2242  may be an indicator of the position of the ultrasound device that performed the 3D sweep relative to the bladder depicted by the 3D visualization  2240 . In some embodiments, the second orientation indicator  2244  may be an indicator of the position of the bottom plane of the ultrasound images collected during the 3D sweep relative to the bladder depicted by the 3D visualization  2240 . Thus, the positions of the first orientation indicator  2242  and/or the second orientation indicator  2244  relative to the 3D visualization  2240  may provide information about the orientation of the 3D visualization  2240  as depicted on the second display screen  104   b.    
     In some embodiments, the foldable processing device  100  may detect a dragging or pinching movement across its touch-sensitive second display screen  104   b  and, based on the dragging or pinching movement, modify the display of the 3D visualization  2240 , the first orientation indicator  2242 , and the second orientation indicator  2244  to depict them as if they were being rotated and/or zoomed in three dimensions. For example, in response to a horizontal dragging movement across the second display screen  104   b  of the foldable processing device  100 , the foldable processing device  100  may display the 3D visualization  2240 , the first orientation indicator  2242 , and the second orientation indicator  2244  such that they appear to be rotated in three dimensions about a vertical axis. In response to a vertical dragging movement, foldable processing device  100  may display the 3D visualization  2240 , the first orientation indicator  2242 , and the second orientation indicator  2244  such that they appear to be rotated in three dimensions about a horizontal axis. In response to a pinching movement, foldable processing device  100  may display the 3D visualization  2240 , the first orientation indicator  2242 , and the second orientation indicator  2244  such that they appear zoomed in. 
     The foldable processing device  100  may advantageously allow a user to view 2D bladder images on the first display screen  104   a  and a 3D bladder visualization on the second display screen  104   b  simultaneously. Further description of 3D sweeps, generating segmented portions, displaying cines, generating 3D visualizations, and other aspects of bladder imaging may be found in U.S. Patent Publication No. 2020/0320694 A1 titled “METHODS AND APPARATUSES FOR COLLECTION AND VISUALIZATION OF ULTRASOUND DATA,” published on Oct. 8, 2020 (and assigned to the assignee of the instant application), which is incorporated by reference herein in its entirety. 
     While  FIG. 22  illustrates the 2D ultrasound image  2208  on the first display screen  104   a , in some embodiments the 2D ultrasound image  2208  may be on the second display screen  104   b . While  FIG. 22  illustrates the 3D visualization  2240  on the second display screen  104   b , in some embodiments the 3D visualization  2240  may be on the first display screen  104   a . While  FIG. 22  and the associated description illustrate and describe 3D imaging sweeps of a bladder, 3D imaging sweeps of other anatomies may be used, and the foldable processing device  100  may display 2D images and 3D visualizations of these other anatomies in the same manner as described above for a bladder. 
       FIG. 23  illustrates the foldable processing device  100  when performing ultrasound imaging and documentation, in accordance with certain embodiments described herein. The first display screen  104   a  displays an ultrasound image  2308 , which may be frozen on the first display screen  104   a  or updated in real time with new ultrasound images. The second display screen  104   b  displays fillable documentation  2352 . A user may fill out the fillable documentation  2352 , and may use the ultrasound image  2308  as a reference when doing so. The fillable documentation  2352  may include, for example, documentation for indications, views, findings, interpretation, and Current Procedural Terminology (CPT) codes. The fillable documentation  2352  may include, for example, dropdown fields, radio buttons, checkboxes, and/or text fields for which a user may provide selections and/or inputs. The user may advantageously view one or more ultrasound images  2352  on the first display screen  104   a  while simultaneously completing the fillable documentation  2352  on the second display screen  104   b . The foldable processing device  100  may store the user selections and/or inputs on the foldable processing device  100  and/or on a remote server. The foldable processing device  100  may associate the user selections and/or inputs with the ultrasound image  2308  and/or an imaging study of which the ultrasound image  2308  is a part. 
     While  FIG. 23  illustrates the ultrasound image  2308  on the first display screen  104   a , in some embodiments the ultrasound image  2308  may be on the second display screen  104   b . While  FIG. 23  illustrates the fillable documentation  2352  on the second display screen  104   b , in some embodiments the fillable documentation  2352  may be on the first display screen  104   a.    
       FIG. 24  illustrates a process  2400  for using the foldable processing device  100  to view ultrasound images in real-time and to freeze ultrasound images on a display screen, in accordance with certain embodiments described herein. 
     In act  2402 , the foldable processing device  100  displays ultrasound images in real-time on the first display screen  104   a  of the foldable processing device  100 . Thus, during the process  2400 , the ultrasound device  124  may be collecting ultrasound data in real-time, and as new ultrasound data is collected, the first display screen  104   a  may replace the ultrasound image displayed on the first display screen  104   a  with a new ultrasound image generated based on the ultrasound data most recently collected by the ultrasound device  124 . In some embodiments, during act  2402 , ultrasound images in real-time may not be displayed on the second display screen  104   b . The process  2400  proceeds from act  2402  to act  2404 . 
     In act  2404 , the foldable processing device  100  receives a selection by a user to freeze an ultrasound image on the first display screen  104   a . The ultrasound image may be one of the ultrasound images displayed in real-time in act  2402 . The foldable processing device  100  may receive the selection through controls displayed on the first display screen  104   a  and/or on the second display screen  104   b  (e.g., the ultrasound imaging controls  1714 ). The user may select the controls by touching the display screen, for example. The process  2400  proceeds from act  2404  to act  2406 . 
     In act  2406 , based on receiving the selection by the user to freeze the ultrasound image on the first display screen  104   a  in act  2404 , the foldable processing device  100  freezes the ultrasound image on the first display screen  104   a  and simultaneously displays ultrasound images in real-time on the second display screen  104   b  of the foldable processing device  100 . The foldable processing device  100  may display the ultrasound images in real-time on the second display screen  104   b  in the same manner that it displayed the ultrasound images in real-time on the first display screen  104   a  in act  2402 . The user may also cause an ultrasound image to freeze on the second display screen  104   b  in the same manner as described above with reference to the first display screen  104   a  in act  2404 . Thus, the user may advantageously view the frozen ultrasound image on the first display screen  104   a  and the real-time ultrasound images and/or frozen ultrasound image on the second display screen  104   b  simultaneously. 
     In some embodiments, at act  2402 , the foldable processing device  100  may display ultrasound images in real-time on the second display screen  104   b . At act  2404 , the foldable processing device  100  may receive a selection by a user to freeze an ultrasound image on the second display screen  104   b . At act  2406 , based on receiving the selection by the user to freeze the ultrasound image on the second display screen  104   b , the foldable processing device  100  may freeze the ultrasound image on the second display screen  104   a  and display ultrasound images in real-time on the first display screen  104   a  of the foldable processing device  100 . 
     It should be appreciated that any of the items described and/or illustrated above as displayed on the first display screen  104   a  or the second display screen  104   b  of the foldable processing device  100  may be displayed together. For example, any combination of ultrasound images (e.g., the ultrasound image the azimuthal plane  408 , the ultrasound image along the elevational plane  410 , or the ultrasound images  608 ,  808 ,  1208 ,  1708 ,  1808 ,  1908 ,  2108 ,  2308 ), ultrasound image displayed as a cine (e.g., the ultrasound image  2208 ), velocity trace (e.g., the velocity trace  610 ), M-mode trace (e.g., the M-mode trace  810 ), actions (e.g., the actions related to ultrasound imaging of the heart  1210 ), quality indicators (e.g., the quality indicator  2112 ), ultrasound imaging controls (e.g., the ultrasound imaging controls  1714 ), subject images (e.g., the subject image  1816 ), remote guide images (e.g., the remote guide image  1818 ), telemedicine controls (e.g., the telemedicine controls  1820 ), set of previously-collected ultrasound images  1922 , 3D visualization (e.g., the 3D visualization  2240 ), and/or fillable documentation  2352  may be displayed together on the same display screen (e.g., either on the first display screen  104   a  or the second display screen  104   b ). 
       FIG. 25  illustrates a schematic block diagram of an example ultrasound system  2500  upon which various aspects of the technology described herein may be practiced. The ultrasound system  2500  includes an ultrasound device  124 , the foldable processing device  100 , a network  2506 , and one or more servers  2508 . 
     The ultrasound device  124  includes ultrasound circuitry  2510 . The foldable processing device  100  includes a camera  2520 , the first display screen  104   a , the second display screen  104   b , a processor  2514 , a memory  2516 , an input device  2518 , a camera  2520 , and a speaker  2522 . The foldable processing device  100  is in wired (e.g., through an Ethernet cable, a Universal Serial Bus (USB) cable, or a Lightning cable,) and/or wireless communication (e.g., using BLUETOOTH, ZIGBEE, and/or WiFi wireless protocols) with the ultrasound device  124 . The illustrated communication link between the ultrasound device  124  and the foldable processing device  100  may be the cable  126  shown in  FIG. 1 . The foldable processing device  100  is in wireless communication with the one or more servers  2508  over the network  2506 . 
     The ultrasound device  124  may be configured to generate ultrasound data that may be employed to generate an ultrasound image. The ultrasound device  124  may be constructed in any of a variety of ways. In some embodiments, the ultrasound device  124  includes a transmitter that transmits a signal to a transmit beamformer which in turn drives transducer elements within a transducer array to emit pulsed ultrasonic signals into a structure, such as a patient. The pulsed ultrasonic signals may be back-scattered from structures in the body, such as blood cells or muscular tissue, to produce echoes that return to the transducer elements. These echoes may then be converted into electrical signals by the transducer elements and the electrical signals are received by a receiver. The electrical signals representing the received echoes are sent to a receive beamformer that outputs ultrasound data. The ultrasound circuitry  2510  may be configured to generate the ultrasound data. The ultrasound circuitry  2510  may include one or more ultrasonic transducers monolithically integrated onto a single semiconductor die. The ultrasonic transducers may include, for example, one or more capacitive micromachined ultrasonic transducers (CMUTs), one or more CMOS (complementary metal-oxide-semiconductor) ultrasonic transducers (CUTs), one or more piezoelectric micromachined ultrasonic transducers (PMUTs), and/or one or more other suitable ultrasonic transducer cells. In some embodiments, the ultrasonic transducers may be formed on the same chip as other electronic components in the ultrasound circuitry  2510  (e.g., transmit circuitry, receive circuitry, control circuitry, power management circuitry, and processing circuitry) to form a monolithic ultrasound device. The ultrasound device  124  may transmit ultrasound data and/or ultrasound images to the foldable processing device  100  over a wired (e.g., through an Ethernet cable, a Universal Serial Bus (USB) cable, or a Lightning cable,) and/or wireless (e.g., using BLUETOOTH, ZIGBEE, and/or WiFi wireless protocols) communication link. The wired communication link may include the cable  126 . 
     Referring now to the foldable processing device  100 , the processor  2514  may include specially-programmed and/or special-purpose hardware such as an application-specific integrated circuit (ASIC). For example, the processor  2514  may include one or more graphics processing units (GPUs) and/or one or more tensor processing units (TPUs). TPUs may be ASICs specifically designed for machine learning (e.g., deep learning). The TPUs may be employed, for example, to accelerate the inference phase of a neural network. The foldable processing device  100  may be configured to process the ultrasound data received from the ultrasound device  124  to generate ultrasound images or other types of displays related to particular ultrasound imaging modes (e.g., velocity traces or M-mode traces) for display on the first display screen  104   a  and/or the second display screen  104   b . The processing may be performed by, for example, the processor  2514 . The processor  2514  may also be adapted to control the acquisition of ultrasound data with the ultrasound device  124 . The ultrasound data may be processed in real-time during a scanning session as the echo signals are received. In some embodiments, the displayed ultrasound image may be updated a rate of at least 5 Hz, at least 10 Hz, at least 20 Hz, at a rate between 5 and 60 Hz, at a rate of more than 20 Hz. For example, ultrasound data may be acquired even as images are being generated based on previously acquired data and while a live ultrasound image is being displayed. As additional ultrasound data is acquired, additional images generated from more-recently acquired ultrasound data may be sequentially displayed (and, in certain ultrasound image modes, various other types of displays such as velocity traces or M-mode traces may be updated based on the newly acquired ultrasound images). Additionally, or alternatively, the ultrasound data may be stored temporarily in a buffer during a scanning session and processed in less than real-time. 
     The foldable processing device  100  may be configured to perform certain of the processes (e.g., the processes  1000 ,  1100 ,  1300 ,  1400 ,  1500 ,  1600 ,  2000 , and/or  2400 ) described herein using the processor  2514  (e.g., one or more computer hardware processors) and one or more articles of manufacture that include non-transitory computer-readable storage media such as the memory  2516 . The processor  2514  may control writing data to and reading data from the memory  2516  in any suitable manner. To perform certain of the processes described herein (e.g., the processes  1000 ,  1100 ,  1300 ,  1400 ,  1500 ,  1600 ,  2000 , and/or  2400 ), the processor  2514  may execute one or more processor-executable instructions stored in one or more non-transitory computer-readable storage media (e.g., the memory  2516 ), which may serve as non-transitory computer-readable storage media storing processor-executable instructions for execution by the processor  2514 . The camera  2520  may be configured to detect light (e.g., visible light) to form an image. The camera  2520  may be on the same face of the foldable processing device  100  as the first display screen  104   a  or the second display screen  104   b . The first display screen  104   a  and the second display screen  104   b  may be configured to display images and/or videos, and may each be, for example, a liquid crystal display (LCD), a plasma display, and/or an organic light emitting diode (OLED) display on the foldable processing device  100 . The input device  2518  may include one or more devices capable of receiving input from a user and transmitting the input to the processor  2514 . For example, the input device  2518  may include a keyboard, a mouse, a microphone, touch-enabled sensors on the first display screen  104   a  and/or the second display screen  104   b , and/or a microphone. The first display screen  104   a , the second display screen  104   b , the input device  2518 , the camera  2520 , and the speaker  2522  may be communicatively coupled to the processor  2514  and/or under the control of the processor  2514 . 
     It should be appreciated that the foldable processing device  100  may be implemented in any of a variety of ways. For example, the foldable processing device  100  may be implemented as a handheld device such as a mobile smartphone or a tablet. Thereby, a user of the ultrasound device  124  may be able to operate the ultrasound device  124  with one hand and hold the foldable processing device  100  with another hand. In other examples, the foldable processing device  100  may be implemented as a portable device that is not a handheld device, such as a laptop. In yet other examples, the foldable processing device  100  may be implemented as a stationary device such as a desktop computer. The foldable processing device  100  may be connected to the network  2506  over a wired connection (e.g., via an Ethernet cable) and/or a wireless connection (e.g., over a WiFi network). The foldable processing device  100  may thereby communicate with (e.g., transmit data to or receive data from) the one or more servers  2508  over the network  2506 . For example, a party may provide from the server  2508  to the foldable processing device  100  processor-executable instructions for storing in one or more non-transitory computer-readable storage media (e.g., the memory  2516 ) which, when executed, may cause the foldable processing device  100  to perform certain of the processes (e.g., the processes  1000 ,  1100 ,  1300 ,  1400 ,  1500 ,  1600 ,  2000 , and/or  2400 ) described herein. 
       FIG. 26  illustrates a top view of a foldable processing device  2600  in an open configuration, in accordance with certain embodiments described herein. The foldable processing device  2600  may be any type of processing device, such as a mobile smartphone or a tablet. The foldable processing device  2600  includes a first panel  2602   a , a second panel  2602   b , and a display screen  2604 . The first panel  2602   a  and the second panel  2602   b  are rotatably coupled by a hinge  2806 , shown in dashed lines in  FIGS. 26 and 27  because it is obstructed by the display screen  2604  in the views of those two figures. The display screen  2604  extends from the first panel  2602   a  to the second panel  2602   b . In some embodiments, the display screen  2604  extends through the hinge  2806 . In some embodiments, the display screen  2604  passes in front of the hinge  2806 . That is, in some embodiments the hinge  2806  is positioned behind the display screen  2604 . While the display screen  2604  is a single, unitary display screen, it may be considered to have two portions, a first display screen portion  2604   a  and a second display screen portion  2604   b , each representing half of the display screen portion  2604  on either side of the hinge  2806 . While the display screen  2604  may display a single display, in some embodiments, as will be described further below, the first display screen portion  2604   a  may display one display and the second display screen portion  2604   b  may depict a different display.  FIG. 26  further illustrates the ultrasound device  124  and the cable  126 . 
       FIG. 26  displays an open configuration for the foldable processing device  2600  in which the first panel  2602   a  and the second panel  2602   b  are substantially coplanar, and the display screen  2604  is visible to a user. The hinge  2806  enables the first panel  2602   a  and/or the second panel  2602   b  to rotate about the hinge  2806  such that the foldable processing device  2600  goes from the open configuration to a folded configuration, as illustrated in the side view of  FIG. 28 . 
       FIG. 27  illustrates another top view of the foldable processing device  2600  in the open configuration, in accordance with certain embodiments described herein. The foldable processing device  2600  is illustrated rotated from the orientation in  FIG. 26 . In some embodiments, in response to rotation of the foldable processing device  2600  from the orientation in  FIG. 26  to the orientation in  FIG. 27 , or vice versa, the foldable processing device  2600  may cause the displays that are displayed on the first display screen portion  2604   a  and/or the second display screen portion  2604   b  to rotate as well. The configuration of  FIG. 26  may be referred to as portrait mode while the configuration of  FIG. 27  may be referred to as landscape mode. 
       FIG. 28  illustrates a side view of the foldable processing device  2600  in a folded configuration, in accordance with certain embodiments described herein. In the folded configuration, the display screen  2604  may fold upon itself, such that the first display screen portion  2604   a  and the second display screen portion  2604   b  face each other, may be in contact with each other, and may not be visible to a user. The first panel  2602   a  and the second panel  2602   b  may be stacked one on top of another. The hinge  2806  enables the first panel  2602   a  and/or the second panel  2602   b  to rotate about the hinge  2806  such that the foldable processing device  2600  goes from the folded configuration to the open configuration, as illustrated in  FIGS. 26 and 27 . As described above, the display screen may extend from the first panel  2602   a , through or in front of the hinge  2806 , and to the second panel  2602   b , such that the display screen  2604  is a single display screen that can fold upon itself along the hinge  2806 . Thus, the display screen  2604  may be considered to be foldable. The foldable processing device  2600  may be more compact in the folded configuration than in the open configuration, while the open configuration may allow the display screen  2604  to be visible. The display screen  2604 , by virtue of being foldable, may provide a relatively large display screen when the foldable processing device  2600  is opened while providing a relatively small form factor when the foldable processing device  2600  is folded. 
     While  FIGS. 26-28  illustrate two hinges  2806 , some embodiments may have one or more hinges, and the hinges may be at different locations. Additionally, other means for coupling the first panel  2602   a  and the second panel  2602   b  together such that the foldable processing device  2600  can go from an open configuration to a folded configuration may be used. For example, the foldable processing device  2600  may be formed of a foldable sheet of continuous material, such as a flexible circuit. It should also be appreciated that the size and shape of the foldable processing device  2600 , the first panel  2602   a , the second panel  2602   b , and the display screen  2604  as illustrated is non-limiting, and that the foldable processing device  2600 , the first panel  2602   a , the second panel  2602   b , and the display screen  2604  may have different sizes and/or shapes than illustrated. 
       FIG. 29  illustrates a schematic block diagram of an example ultrasound system  2900  upon which various aspects of the technology described herein may be practiced. The ultrasound system  2900  includes the ultrasound device  124 , the foldable processing device  2600 , the network  2506 , and the one or more servers  2508 . 
     The foldable processing device  2600  includes the display screen  2604 , a processor  2914 , a memory  2916 , an input device  2918 , a camera  2920 , and a speaker  2922 . The display screen  2604  has a first display portion  2604   a  and a second display portion  2604   b . Further description of the foldable processing device  2600 , the display screen  2604 , the processor  2914 , the memory  2916 , the input device  2918 , the camera  2920 , and the speaker  2922  may be found with reference to the foldable processing device  100 , the first display screen  104   a  and the second display screen  104   b , the processor  2514 , the memory  2516 , the input device  2518 , the camera  2520 , and the speaker  2522  described above. 
     Any of the features and operation of the foldable processing device  100 , the first display screen  104   a , and the second display screen  104   b  described above may also be implemented in the foldable processing device  2600 , the first display screen portion  2604   a  of the display screen  2604 , and the second display screen portion  2604   b  of the display screen  2604 , respectively. In other words, for any application in which a first display is described above as displayed on the first display screen  104   a  of the foldable processing device  100  and a second display is described above as displayed on the second display screen  104   b  of the foldable processing device  100 , the first display may instead be displayed on the first display screen portion  2604   a  of the foldable processing device  2600  and the second display may instead be displayed on the second display screen portion  2604   b  of the foldable processing device  2600 . Thus, in any of  FIGS. 4-9, 12, 17-19 , and  21 - 23 , the display shown on the first display screen  104   a  of the foldable processing device  100  may be shown on the first display screen portion  2604   a  of the foldable processing device  2600 , and the display shown on the second display screen  104   b  of the foldable processing device  100  may be shown on the second display screen portion  2604   b . In any of processes  1000 ,  1100 ,  1300 ,  1400 ,  1500 ,  1600 ,  2000 , and/or  2400 , the display shown on the first display screen  104   a  of the foldable processing device  100  may be shown on the first display screen portion  2604   a  of the foldable processing device  2600 , and the display shown on the second display screen  104   b  of the foldable processing device  100  may be shown on the second display screen portion  2604   b . As a particular example, the first display screen portion  2604   a  may display an ultrasound image along the elevational plane and the second display screen portion  2604   b  may display an ultrasound image along the azimuthal plane, corresponding to the configuration of  FIG. 4 . 
     In a first group of embodiments, a foldable processing device is provided, comprising: a first panel; a second panel; one or more hinges, wherein the first panel and the second panel are rotatably coupled by the one or more hinges; and a foldable display screen extending between the first panel and the second panel, configured to fold upon itself about the one or more hinges, and comprising a first display screen portion and a second display screen portion, each on a different side of the one or more hinges. The foldable processing device is in operative communication with an ultrasound device. In a second group of embodiments, a foldable processing device is provided, comprising: a first panel comprising a first display screen; a second panel comprising a second display screen; and one or more hinges, wherein the first panel and the second panel are rotatably coupled by the one or more hinges. In any of the first and second groups of embodiments, the foldable processing device may be in operative communication with an ultrasound device. 
     In any of the first and second groups of embodiments of a foldable processing device, the foldable processing device may be configured to simultaneously: display an ultrasound image along an elevational plane on the first display screen or display screen portion; and display an ultrasound image along an azimuthal plane on the second display screen or display screen portion. 
     In any of the first and second groups of embodiments of a foldable processing device, the foldable processing device may be configured to simultaneously: display an ultrasound image on the first display screen or display screen portion; and display a pulsed wave Doppler imaging mode velocity trace on the second display screen or display screen portion. 
     In any of the first and second groups of embodiments of a foldable processing device, the foldable processing device may be configured to simultaneously: display an ultrasound image on the first display screen or display screen portion; and display an M-mode trace on the second display screen or display screen portion. 
     In any of the first and second groups of embodiments of a foldable processing device, the foldable processing device may be configured to simultaneously: display an ultrasound image on the first display screen or display screen portion; and display actions related to ultrasound imaging of an anatomical portion on the second display screen or display screen portion. The actions related to ultrasound imaging of the anatomical portion comprise actions performed by the foldable processing device that enable a user: to annotate the ultrasound image with annotations specific to the anatomical portion; to be guided by the foldable processing device to collect an ultrasound image of the anatomical portion; to cause the foldable processing device to automatically perform a calculation related to the anatomical portion, wherein the calculation related to the anatomical portion comprises calculation of ejection fraction, counting of B-lines, calculation of bladder volume, calculation of gestational age, calculation of estimated delivery date, calculation of fetal weight, and/or calculation of amniotic fluid index; and/or to view a video related to ultrasound imaging of the anatomical portion. 
     In any of the first and second groups of embodiments of a foldable processing device, the foldable processing device may be configured to simultaneously: display an ultrasound image on the first display screen or display screen portion; and display a quality indicator for the ultrasound image related to ultrasound imaging of an anatomical portion on the second display screen or display screen portion. 
     In any of the first and second groups of embodiments of a foldable processing device, the foldable processing device may be configured to: display an ultrasound image on the first display screen or display screen portion; and display ultrasound imaging controls on the second display screen or display screen portion, wherein the ultrasound imaging controls comprise controls for freezing the ultrasound image, capturing the ultrasound image as a still image, recording an ultrasound clip, adjusting gain, adjusting depth, adjusting time gain compensation (TGC), selecting an anatomical portion to be imaged, selecting an ultrasound imaging mode, annotating the ultrasound image, and/or performing measurements on the ultrasound image. 
     In any of the first and second groups of embodiments of a foldable processing device, the foldable processing device may be configured to: display an ultrasound image on the first display screen or display screen portion; and display a portion of a telemedicine interface on the second display screen or display screen portion, wherein: the telemedicine interface comprises a subject image, a remote guide image, and/or telemedicine controls; the subject image is a frame of a video captured by a camera of the foldable processing device and shows a subject being imaged, the ultrasound device, and an instruction for moving the ultrasound device; and the instruction comprises an instruction to translate, rotate, or tilt the ultrasound device. 
     In any of the first and second groups of embodiments of a foldable processing device, the foldable processing device may be configured to: display a set of saved ultrasound images on the second display screen or display screen portion as thumbnails; receive a selection by a user of an ultrasound image or image(s) from the set of saved ultrasound images; and display the ultrasound image or image(s) on the first display screen or display screen portion at a larger size than they are displayed on the second display screen or display screen portion. 
     In any of the first and second groups of embodiments of a foldable processing device, the foldable processing device may be configured to: display an ultrasound image on the first display screen or display screen portion; display fillable documentation on the second display screen or display screen portion, wherein the fillable documentation comprises a dropdown field, radio button, checkbox, and text field for which a user may provide selection and/or input; and store the user selection and/or input on the foldable processing device and/or on a remote server. 
     In any of the first and second groups of embodiments of a foldable processing device, the foldable processing device may be configured to: display an ultrasound image of a bladder on the first display screen or display screen portion; and display a three-dimensional visualization of the bladder on the second display screen or display screen portion. 
     In any of the first and second groups of embodiments of a foldable processing device, the foldable processing device may be configured to: display ultrasound images in real-time on a first display screen or display screen portion of the foldable processing device; receive a selection by a user to freeze an ultrasound image on the first display screen or display screen portion; and based on receiving the selection by the user to freeze the ultrasound image on the first display screen or display screen portion, freeze the ultrasound image on the first display screen or display screen portion and simultaneously display ultrasound images in real-time on the second display screen or display screen portion of the foldable processing device. 
     The indefinite articles “a” and “an,” as used herein in the specification and in the claims, unless clearly indicated to the contrary, should be understood to mean “at least one.” 
     The phrase “and/or,” as used herein in the specification and in the claims, should be understood to mean “either or both” of the elements so conjoined, i.e., elements that are conjunctively present in some cases and disjunctively present in other cases. Multiple elements listed with “and/or” should be construed in the same fashion, i.e., “one or more” of the elements so conjoined. Other elements may optionally be present other than the elements specifically identified by the “and/or” clause, whether related or unrelated to those elements specifically identified. 
     As used herein in the specification and in the claims, the phrase “at least one,” in reference to a list of one or more elements, should be understood to mean at least one element selected from any one or more of the elements in the list of elements, but not necessarily including at least one of each and every element specifically listed within the list of elements and not excluding any combinations of elements in the list of elements. This definition also allows that elements may optionally be present other than the elements specifically identified within the list of elements to which the phrase “at least one” refers, whether related or unrelated to those elements specifically identified. 
     Use of ordinal terms such as “first,” “second,” “third,” etc., in the claims to modify a claim element does not by itself connote any priority, precedence, or order of one claim element over another or the temporal order in which acts of a method are performed, but are used merely as labels to distinguish one claim element having a certain name from another element having a same name (but for use of the ordinal term) to distinguish the claim elements. 
     As used herein, reference to a numerical value being between two endpoints should be understood to encompass the situation in which the numerical value can assume either of the endpoints. For example, stating that a characteristic has a value between A and B, or between approximately A and B, should be understood to mean that the indicated range is inclusive of the endpoints A and B unless otherwise noted. 
     The terms “approximately” and “about” may be used to mean within ±20% of a target value in some embodiments, within ±10% of a target value in some embodiments, within ±5% of a target value in some embodiments, and yet within ±2% of a target value in some embodiments. The terms “approximately” and “about” may include the target value. 
     Also, the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having,” “containing,” “involving,” and variations thereof herein, is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. 
     Having described above several aspects of at least one embodiment, it is to be appreciated various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be object of this disclosure. Accordingly, the foregoing description and drawings are by way of example only.