Patent Description:
Radiographic devices using radiation such as X-rays are imaging devices that radiate radiation onto an affected part of a human or animal body and receive penetrating radiation to acquire an image of the affected part. Such radiographic devices are devices that continuously or consecutively provide radiographic images of an affected part and are widely used for diagnosing or reading of the affected part and various medical procedures.

Since a radiographic device radiates radiation such as X-rays onto a subject, it is important to control a radiation dose applied to the subject. In particular, since a C-arm type radiographic device performs X-ray imaging for a relatively long time, it is necessary to minimize an X-ray dose. In addition, recently, a need for precise high-resolution and real-time images for accurate diagnosis and treatment has increased considerably, and in order to improve the quality of a radiographic image, an increase in radiation dose is also necessary.

In particular, recently in the medical imaging field, a need for precise high-resolution and real-time images for accurate diagnosis and treatment has been considerably increasing. For example, imaging devices such as a C arm type fluoroscopy device providing real-time images, a high-definition X-ray imaging device, and a CT device providing various tomographic images and three dimensional (3D) reconstruction images are being developed. Interventional procedures using 3D imaging (CT) and fluoroscopy are increasing. In this case, the quality of X-ray images should be excellent to increase the stability of the surgery procedure, and a radiation dose is inevitably increased to obtain a high-quality image. For this reason, it is important to control an X-ray exposure dose in a radiographic device, particularly in a C arm X-ray imaging device.

In conventional radiographic devices, a collimator is provided to adjust a flux of radiation. Two leaf collimators may be moved at both sides with respect to a center of a flux of radiation to block a flux portion of radiation.

When an image biased to one side from the center of a radiographic image or an area of interest is positioned at a periphery rather than the center of the radiographic image, there has been a problem of unnecessary radiation exposure to parts other than the area of interest, and in some cases, there has also been a problem that a radiation dose has been increased because a radiation irradiator should be repositioned to perform imaging again to adjust the brightness of radiation. In addition, when a position of a collimator needs to be reset due to the patient's movement after the position of the collimator is set, there has been a problem that both a patient and a photographer have been exposed to additional radiation.

<CIT> discloses an X-ray device including a camera to image an object and output the image of the object, a display member using a touch screen to display the image of the object output from the camera, and an X-ray irradiation region of the object, an X-ray irradiation region controller to control a region of the object to which an X-ray is irradiated, and a control member to enable the irradiation region controller to control the region of the object to which an X-ray is irradiated according to the X-ray irradiation region, when the X-ray irradiation region is determined, based on the image of the object displayed in the display member.

<CIT> discloses a radiographic apparatus may comprising a radiation irradiating module configured to irradiate radiation to an object, and/or a processing module configured to automatically set a part of a region to which the radiation irradiating module is able to irradiate the radiation, to a region of interest, and further configured to determine at least one of a radiation irradiation position and a radiation irradiation zone of the radiation irradiating module based on the region of interest.

<CIT> discloses an X-ray imaging apparatus including an imaging device that captures a camera image of a target, a controller that stitches a plurality of X-ray images of a plurality of divided regions to generate one X-ray image of the target, and a display that displays a settings window providing a graphical user interface for receiving a setting of an X-ray irradiation condition for the divided regions, and displays the camera image in which positions of the divided regions are displayed.

The present invention is directed to providing a radiographic device capable of reducing a radiation exposure dose to a user by performing local radiography on a selection area in a radiographic image, and a radiation flux control method using the same.

According to the present invention, radiation is radiated onto a limited selection area, which is a local area selected by a user, to acquire a radiographic image, thereby reducing a radiation exposure dose. Therefore,
when an image is biased to one side from the center of the radiographic image or a user's area of interest is not at the center of the radiographic image and is positioned at an edge, there is an effect of suppressing unnecessary radiation exposure to parts other than the area of interest.

In addition, since surgery can be continued without the movement of a radiation generator during surgery, it is possible to eliminate the inconvenience of having to readjust the position of a radiation irradiator and perform imaging for radiation brightness adjustment again. When a position of a collimator is readjusted, a time taken for adjusting the position of the collimator is shortened, thereby obtaining an effect of shortening a surgery time and improving user convenience.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily practice the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments to be described hereafter.

Referring to <FIG>, a radiographic device according to an embodiment of the present invention includes a radiation irradiator <NUM>, an image acquisition unit <NUM>, a determination controller <NUM>, and a display unit <NUM>. The radiation irradiator <NUM> includes a collimator capable of asymmetrically blocking a flux of radiation in a cross section of the flux of radiation radiated onto an irradiation target object. The collimator may be configured to selectively block the flux of radiation and implement a desired radiation irradiation range. In addition, the radiation irradiator <NUM> may include a radiation source, for example, an X-ray source for generating radiation, for example, X-rays. The image acquisition unit <NUM> acquires an image signal by receiving radiation penetrating an irradiation target object. The image acquisition unit <NUM> may include a radiation detector, for example, an X-ray detector that detects radiation penetrating an irradiation target object, for example, X-rays. The display unit <NUM> displays a radiological image based on the image signal. The determination controller <NUM> transmits blocking information, which is for blocking the remaining flux portion of radiation excluding a flux portion of radiation corresponding to a selection area selected in the radiological image, to the radiation irradiator <NUM>.

The radiographic device may further include an input unit that receives a selection area selected in the radiological image from a user.

The display unit <NUM> may include a touch screen capable of receiving the selection area selected in the radiological image from the user. In this case, an input unit does not need to be provided separately, but even when an input is possible through the display unit <NUM> such as a touch screen, an input unit such as a mouse, a keyboard, a control panel, or the like may also be provided.

A plurality of collimators <NUM>, <NUM>, <NUM>, and <NUM> may be provided in the radiation irradiator <NUM>. Preferably, the plurality of collimators <NUM>, <NUM>, <NUM>, and <NUM> may be simultaneously driven. The collimator provided in the radiation irradiator <NUM> is not limited to four collimators as shown in <FIG> and <FIG> and may be implemented in various structures capable of changing or adjusting a radiation irradiation range by at least partially blocking a flux of radiation.

Preferably, the plurality of collimators <NUM>, <NUM>, <NUM>, and <NUM> are configured to block a portion of a radiation flux <NUM> by moving asymmetrically or non-interlockingly with each other. In addition, it is also preferable to enlarge and display a portion corresponding to the selection area in the radiological image displayed on the display unit <NUM>.

As an example of the radiation irradiator <NUM> for radiating radiation onto an irradiation target object, there may be an X-ray generator. In the X-ray generator, an electron beam accelerated from a filament-shaped cathode provided in a vacuum tube is incident on a target material on an anode in a high-energy state to generate X-rays in the form of a conical beam. The radiation irradiator <NUM> outputs radiation according to a radiation output condition and radiates the radiation onto an irradiation target object. Here, the radiation output condition may include an output voltage and an output current of X-rays which are radiation. The radiation output condition may be received from the determination controller <NUM>.

The determination controller <NUM> and the radiation irradiator <NUM> are electrically connected such that the radiation output condition may be transferred from the determination controller <NUM> to the radiation irradiator <NUM>. Therefore, the radiation irradiator <NUM> outputs X-rays according to the radiation output condition received from the determination controller <NUM> and radiates the X-rays onto an irradiation target object. A control signal for controlling the driving of the collimators <NUM>, <NUM>, <NUM>, and <NUM> may also be transmitted from the determination controller <NUM> to the radiation irradiator <NUM>. The driving of the collimators <NUM>, <NUM>, <NUM>, and <NUM> may be controlled according to blocking information which is a control signal for controlling the driving of the collimators <NUM>, <NUM>, <NUM>, and <NUM>.

The collimators <NUM>, <NUM>, <NUM>, and <NUM> are provided at a front side of the radiation irradiator <NUM> to determine a shape of X-rays and an irradiation area. The radiation irradiator <NUM> includes the collimators <NUM>, <NUM>, <NUM>, and <NUM> capable of asymmetrically blocking a flux of radiation in a cross section of the flux of radiation radiated onto an irradiation target object. The radiation irradiator <NUM> controls the driving of the collimators <NUM>, <NUM>, <NUM>, and <NUM> according to a control signal transmitted from the determination controller <NUM>, that is, radiation flux blocking information.

<FIG> and <FIG> are schematic diagrams illustrating a flux of radiation and the plurality of collimators in the radiation irradiator of the radiographic device according to an embodiment of the present invention. <FIG> schematically illustrates a state in which the plurality of collimators do not block a flux of radiation. <FIG> schematically illustrates a state in which each of the plurality of collimators blocks a portion of a flux of radiation.

Referring to <FIG> and <FIG>, four collimators <NUM>, <NUM>, <NUM>, and <NUM> are provided at a front side in a direction in which X-rays, which are radiation, travel from the radiation irradiator <NUM>. Each of the first collimator <NUM>, the second collimator <NUM>, the third collimator <NUM>, and the fourth collimator <NUM> may move independently toward a center of the radiation flux <NUM> as indicated by arrows in <FIG> according to a control signal, that is, blocking information, thereby blocking a portion of the radiation flux <NUM> as shown in <FIG>. That is, each of the first collimator <NUM>, the second collimator <NUM>, the third collimator <NUM>, and the fourth collimator <NUM> independently moves according to blocking information. In addition, it is preferable that the first collimator <NUM>, the second collimator <NUM>, the third collimator <NUM>, and the fourth collimator <NUM> move simultaneously. For this, a motor (not shown) may be provided in the radiation irradiator <NUM> as a driving device for moving the first collimator <NUM>, the second collimator <NUM>, the third collimator <NUM>, and the fourth collimator <NUM> to block or open a portion of the radiation flux <NUM>.

A portion of the radiation flux <NUM> not blocked by the first collimator <NUM>, the second collimator <NUM>, the third collimator <NUM>, and the fourth collimator <NUM> is a portion corresponding to a selection area to be described below and is radiated onto an irradiation target object.

The image acquisition unit <NUM> acquires an image signal by receiving radiation penetrating an irradiation target object. That is, the image acquisition unit <NUM> acquires an image signal by converting incident X-rays that have penetrated an irradiation target object into an image signal. The image acquisition unit <NUM> is positioned opposite to the X-ray generator and converts X-rays penetrating the irradiation target object into a visible light image signal. The image acquisition unit <NUM> transmits the image signal to the determination controller <NUM> electrically connected thereto.

The image signal transmitted to the determination controller <NUM> is transmitted to the display unit <NUM> and becomes a basis for displaying a radiographic image on the display unit <NUM>. As described above, the display unit <NUM> displays the radiographic image based on the image signal acquired by the image acquisition unit <NUM>. As an example of the display unit <NUM> that displays the radiographic image based on the image signal, there may be a display device that visually displays various types of information.

In addition, a form capable of receiving input from a user through a screen, such as a touch screen capable of receiving an input from a user, is also preferable for the display unit <NUM>. The display unit <NUM> may separately include an input unit such as a mouse as needed. When the display unit <NUM> has a form capable of receiving an input, such as a touch screen, information input through a touch or a drag by a user's hand or a touch pen may be transmitted to the determination controller <NUM>, and the determination controller <NUM> may change various settings to reflect the input information.

The determination controller <NUM> may allow a user to set an irradiation condition or output condition of radiation or may control an X-ray irradiation area by controlling each of the first collimator <NUM>, the second collimator <NUM>, the third collimator <NUM>, and the fourth collimator <NUM> of the radiation irradiator <NUM>. Also, the determination controller <NUM> may control the image acquisition unit <NUM>, the radiation irradiator <NUM>, the display unit <NUM>, and the like.

The determination controller <NUM> transmits blocking information, which is for blocking the remaining portion of a flux of radiation excluding a radiation flux portion <NUM> corresponding to a selection area selected in a radiological image, to the radiation irradiator <NUM>. In other words, it can be said that the determination controller <NUM> transmits blocking information for transmitting only the radiation flux portion <NUM> corresponding to the selection area selected in the radiographic image to the radiation irradiator <NUM>.

<FIG> shows an example in which the radiographic device sets a selection area and displays a radiographic image acquired according to the selection area according to an embodiment of the present invention. First, referring to <FIG>, a selection area <NUM> may be selected in a radiographic image displayed on the screen of the display unit <NUM>, and the selection area <NUM> may be displayed with a boundary line to be identifiable. When the corresponding selection area is imaged and is to be enlarged in a state in which the selection area <NUM> is selected, an enlargement command area <NUM> provided on the display unit <NUM> is touched to capture an image corresponding to the corresponding selection area. That is, after a position of the collimator is adjusted such that a radiation irradiation range corresponding to the corresponding selection area is implemented, the radiation irradiator <NUM> is controlled to radiate radiation. As shown in <FIG>, a radiographic image newly acquired in this way, that is, an enlarged radiographic image corresponding to the selection area, is displayed on the display unit <NUM>.

The display unit <NUM> displays a first radiographic image in which a command for selecting the selection area is input and a second radiographic image corresponding to the selection area. To this end, the display unit <NUM> includes an input display which displays the first radiographic image for inputting the selection area and a main display which displays the second radiographic image captured and acquired under conditions corresponding to the selection area. For example, the input display may be provided on a mobile cart of a mobile C arm X-ray device, and the main display may be provided on a separate operating console.

Next, a radiation flux control method using the radiographic device according to an embodiment of the present invention will be described with further reference to <FIG>. The radiographic device according to the embodiment of the present invention may be further understood through the description of the radiation flux control method.

<FIG> is a schematic flowchart illustrating the radiation flux control method using the radiographic device according to the embodiment of the present invention. Referring to <FIG>, the radiation flux control method using the radiographic device according to the embodiment of the present invention may include the first image display process S110 of displaying a first radiographic image of an irradiation target object, the selection area setting process S120 of receiving an area selected from the radiographic image to set a selection area, the collimator driving process S130 of blocking the remaining portion excluding a portion of a flux of radiation corresponding to the selection area using a collimator, and the second image display process S140 of displaying a second radiographic image acquired by radiating the portion of the flux of radiation corresponding to the selection area onto an irradiation target object.

Here, in the second image display process S140, the portion corresponding to the selection area in the second radiographic image may be enlarged and displayed.

The first image display process S110 is a process of displaying the first radiographic image of the irradiation target object. That is, in the first image display process S110, X-rays which are radiation are radiated onto the irradiation target object, the X-rays penetrating the irradiation target object are received to acquire an image signal, and a radiographic image, that is, an X-ray image, is displayed on the screen based on the image signal such that a user or the like may confirm the acquired image signal.

The radiation irradiator <NUM> radiates radiation, for example, X-rays, onto the irradiation target object. When the radiation irradiator <NUM> radiates the X-rays onto the irradiation target object, the X-rays penetrate the irradiation target object and are incident on the image acquisition unit <NUM>.

The image acquisition unit <NUM> acquires an image signal from the incident X-rays and transmits the acquired image signal to the determination controller <NUM>. The determination controller <NUM> transmits the image signal to the display unit <NUM>, and the display unit <NUM> visually displays a radiographic image based on the image signal.

<FIG> is a diagram exemplarily showing an image of a radiographic image acquired by the radiographic device according to an embodiment of the present invention. As shown in <FIG>, an X-ray image, which is the radiographic image, is displayed on the screen of the display unit <NUM>. For reference, a horizontal axis and a vertical axis in <FIG> are coordinate axes for indicating pixel coordinates or image coordinates on the screen of the display unit <NUM>. Accordingly, center coordinates of a center of the screen, that is, center coordinates of a center of the X-ray image, may be expressed as (<NUM>, <NUM>).

The selection area setting process S120 is a process of setting the selection area by receiving the area selected in the radiographic image. Here, the selection area is an area selected in the X-ray image as shown in <FIG> according to a user's selection. When the display unit <NUM> is a touch screen, a user's hand or a touch pen may be used to set the selection area through a drag method. Alternatively, when an input unit such as a mouse is provided, the selection area may be set in a manner of starting to drag a mouse cursor at one point and ending the dragging at another point.

<FIG> is a schematic diagram showing an image showing a selection area in a radiographic image acquired by the radiographic device according to the present invention. For example, as shown in <FIG>, when a user positions the user's hand, a touch pen, or a mouse cursor at coordinate points (<NUM>, <NUM>) and starts dragging, and then ends the dragging at the coordinate points (<NUM>, <NUM>), a quadrangular area connecting four coordinate points (<NUM>, <NUM>), (<NUM>, <NUM>), (<NUM>, <NUM>), and (<NUM>, <NUM>) is selected as a selection area <NUM>. Here, the user may change and redesignate the selection area <NUM> or may determine the selection area <NUM>. Redesignation for changing the selection area <NUM> may be performed in a manner of starting dragging at one point and ending the dragging at another point as described above. The selection area <NUM> may be determined without a separate input for determining the selection area, but as described above, the selection area <NUM> may be selected through dragging, and then a storage button (not shown) may be touched to determine the selection area <NUM>. In this way, the selection area <NUM> may be set in the selection area setting process S120.

A user may input a target area, that is, an area to be enlarged, in a desired range, size, and shape through a touch gesture input such as dragging. In this case, a selection area selected by the user may be displayed on the display unit <NUM> (an area partitioned by a dotted line in <FIG>). The user can easily confirm a selection area selected by the user on a displayed image through display of the selection area displayed by a user interface and can easily determine whether to determine the selection area displayed by his/her own manipulation or whether to reset the selection area. Accordingly, an unnecessary imaging process can be avoided to reduce radiation exposure.

A selection area may be set in various ways in addition to the above-described drag operation on the touch screen or a drag operation using a mouse. For example, a selection area may be set using various touch gesture input methods including a tap, a double tap, a press touch gesture, and the like.

In addition, setting, confirming, changing, resetting, and determining a selection area may be performed in various ways. When the user taps and touches a specific point on an image displayed on the display unit <NUM>, a basic selection area having a set size and a set shape such as a rectangular or circular shape on the screen is displayed around a corresponding portion. Then, the displayed basic selection area is touched and dragged to adjust a size and a shape and set an adjustment selection area, and then when a touch gesture for determining the adjustment selection area as a selection area a double tap touch, is input, the adjustment selection area may be set as a final selection area and maintained. Then, when the user inputs a touch gesture for capturing an image of the selection area a press touch within a certain time range, an image of the corresponding selection area is captured. In this way, through various touch gesture inputs using the display unit <NUM> including the touch screen, a selection area may be set in various ways, and the collimator may be moved according to the selection area to control a radiation irradiation range, and an image may be captured.

The pixel coordinates or image coordinates (<NUM>, <NUM>), (<NUM>, <NUM>), (<NUM>, <NUM>), and (<NUM>, <NUM>) of the selection area selected by the user may be transmitted to the determination controller <NUM> and may be changed into coordinates of the collimator corresponding to the selection area <NUM> by the determination controller <NUM>. The coordinates of the collimator corresponding to the selection area <NUM> are included in the above-described blocking information and transmitted to the radiation irradiator <NUM>.

The collimator driving process S130 is a process of blocking the remaining portion excluding a portion of the flux of radiation corresponding to the selection area <NUM> using the collimator. As described above, the pixel coordinates or image coordinates (<NUM>, <NUM>), (<NUM>, <NUM>), (<NUM>, <NUM>), and (<NUM>, <NUM>) of the selection area selected by the user may be transmitted to the determination controller <NUM> and may be changed into the coordinates of the collimator corresponding to the selection area <NUM> by the determination controller <NUM>.

The coordinates of the collimator corresponding to the selection area <NUM> are included in the above-described blocking information and transmitted to the radiation irradiator <NUM>. Each of the four collimators <NUM>, <NUM>, <NUM>, and <NUM> in the radiation irradiator <NUM> receiving the blocking information is moved as shown in <FIG> according to collimator coordinate information included in the blocking information, and a portion of the radiation flux <NUM> is blocked by the collimator. The unblocked radiation flux portion <NUM> corresponds to the selection area <NUM>.

The four collimators <NUM>, <NUM>, <NUM>, and <NUM> may each independently be moved and may be moved simultaneously. Therefore, it is possible to shorten a time taken for the four collimators <NUM>, <NUM>, <NUM>, and <NUM> to move to block a portion of the radiation flux <NUM>.

When the four collimators <NUM>, <NUM>, <NUM>, and <NUM> are moved according to coordinate information of the collimator, a portion of the radiation flux <NUM>, that is, a portion of an X-ray flux <NUM> is blocked when X-rays, which are radiation, are radiated, thereby reducing an exposure dose to a patient or user.

The second image display process S140 is a process of displaying the second radiographic image acquired by radiating the radiation flux portion <NUM> corresponding to the selection area <NUM> onto the irradiation target object.

That is, after the position movement of the four collimators is completed as described above, in the second image display process S140, X-rays are radiated on the irradiation target object, the X-rays penetrating the irradiation target object are received to acquire an image signal, and the second radiographic image, that is, a second X-ray image, is displayed on the screen based on the image signal such that a user or the like may confirm the acquired image signal.

That is, the radiation irradiator <NUM> radiates X-rays, which are radiation, onto the irradiation target object. When the radiation flux portion <NUM> corresponding to the selection area <NUM> is radiated from the radiation irradiator <NUM> to the irradiation target object, X-rays, which are radiation, penetrate a portion of the irradiation target object corresponding to the selection area <NUM> and are incident on the image acquisition unit <NUM>. The image acquisition unit <NUM> acquires an image signal from incident X-rays and transmits the acquired image signal to the determination controller <NUM>. The determination controller <NUM> transmits the image signal to the display unit <NUM>, and the display unit <NUM> visually displays the second X-ray image, which is the second radiographic image, based on the image signal.

<FIG> is a schematic graph illustrating an image in which a portion other than a selection area is covered by four collimators in the radiographic device according to an embodiment of the present invention. As can be seen from <FIG>, since an X-ray flux is blocked by the four collimators <NUM>, <NUM>, <NUM>, and <NUM> at a portion other than the selection area <NUM>, an image of a corresponding area is not displayed.

Here, since a portion corresponding to the selection area <NUM> is biased on the screen of the display unit <NUM>, position control may be performed such that a center of the selection area <NUM> is positioned at a center of the screen of the display unit <NUM>. That is, a position of an X-ray image of the selection area <NUM> may be adjusted such that center image coordinates (<NUM>, <NUM>) of the selection area <NUM> are positioned at center coordinates (<NUM>, <NUM>) of the screen. Position adjustment of the X-ray image of the selection area <NUM> may be performed through coordinate conversion.

Also, the selection area <NUM> of the second X-ray image may be enlarged and displayed to fill the screen of the display unit <NUM>. The second X-ray image corresponding to the selection area may be image-fitted to the screen of the display unit <NUM> and displayed on the screen of the display unit <NUM>. For example, the second X-ray image may be enlarged and fit to be displayed on the screen of the display unit <NUM>.

<FIG> is a schematic diagram showing an image of an enlarged and displayed selection area on a second radiographic image acquired by the radiographic device according to the present invention. The selection area <NUM> on the second radiographic image may be enlarged and displayed as shown in <FIG>. Enlarging and displaying the selection area <NUM> may be implemented in various forms. For example, a ratio of a length of the longest side in the selection area <NUM> to a length of the screen on which the X-ray image is displayed on the screen of the display unit <NUM> may be converted into a magnification ratio to enlarge the selection area <NUM>. As described above, the selection area <NUM> in the second radiographic image may be enlarged and displayed as shown in <FIG>.

As necessary, when the brightness of a radiographic image decreases or the sharpness of the radiographic image decreases as the selection area <NUM> is enlarged and displayed, the intensity of a radiation flux may be changed to complement the brightness of the radiographic image or the sharpness of the radiographic image.

The execution order of the processes S110, S120, S130, or S140 described above is not limited to the above-described order and may be changed as needed. In addition, each process may be repeatedly performed.

Claim 1:
A radiographic device comprising:
a radiation irradiator (<NUM>) configured to radiate radiation onto an irradiation target object and including a plurality of collimators (<NUM>, <NUM>, <NUM>, <NUM>) configured to selectively block a flux of the radiation;
an image acquisition unit (<NUM>) acquiring an image signal by receiving the radiation penetrating the irradiation target object;
a display unit (<NUM>) displaying a radiographic image based on the image signal; and
a determination controller (<NUM>) configured to control the radiation irradiator (<NUM>) such that an irradiation range of the radiation corresponding to a selection area selected in the radiographic image is implemented,
characterised in that
wherein the plurality of collimators (<NUM>, <NUM>, <NUM>, <NUM>) is provided to be simultaneously driven while the plurality of collimators (<NUM>, <NUM>, <NUM>, <NUM>) moves asymmetrically with each other to block at least a portion of the flux of the radiation,
wherein the display unit (<NUM>) include an input display which displays a first radiographic image for inputting the selection area and a main display which displays a second radiographic image captured and acquired under conditions corresponding to the selection area,
wherein the determination controller (<NUM>) is further configured to:
control the input display to display a basic selection area having a set size and a set shape, such as, a rectangular or circular shape, corresponding to a specific point, when a user taps and touches the specific point on the first radiographic image displayed on the input display,
adjust the size and shape of the displayed basic selection area and set an adjustment selection area when the displayed basic selection area is touched and dragged,
set the adjustment selection area as a final selection area, when a double tap touch is input, and
control the image acquisition unit (<NUM>) to capture an image of the final selection area, when a press touch within a certain time range is input.