Patent Description:
Standard compression methods for mammography and tomosynthesis use a movable, rigid, radiolucent compression paddle. The breast is placed on a breast support platform that typically is flat, and the paddle then compresses the breast, usually while a technologist or other health professional is holding the breast in place. The technologist may also manipulate the breast to ensure proper tissue coverage in the image receptor's field of view.

One known challenge in mammography and breast tomosynthesis is the discomfort the patient may feel when the breast is compressed, which must be done with sufficient force to immobilize the breast and spread out the breast tissues for x-ray imaging. Another known challenge is to ensure that the imaged field includes the desired amount of breast tissue.

In one aspect not forming part of the present invention, the technology relates to a breast compression paddle for use in an imaging system, the breast compression paddle including: a compression surface; and a jacket including at least one inflatable chamber disposed adjacent to the compression surface and a sheet covering at least a portion of the compression surface, wherein the at least one inflatable chamber is configured to selectively inflate and induce the sheet to slide along the compression surface.

In an example, the sheet includes at least one cushioning chamber covering at least a portion of the compression surface. In another example, the at least one cushioning chamber is configured to selectively inflate. In yet another example, the at least one cushioning chamber is configured to inflate to a pressure that is lower than a pressure of the at least one inflatable chamber. In still another example, the inflation pressure of the at least one inflatable chamber and the inflation pressure of the at least one cushioning chamber are independently controlled. In an example, the at least one cushioning chamber includes a plurality of chambers.

In another example, the breast compression paddle further includes a bracket or integral feature having a recess defined adjacent to the compression surface, wherein the at least one inflatable chamber is disposed proximate the bracket or integral feature and is configured to selectively inflate at least partially into the recess. In yet another example, the sheet is configured to slide along the compression surface substantially simultaneously with the at least one inflatable chamber selectively inflating. In still another example, the breast compression paddle further includes a top surface opposite the compression surface, wherein the jacket substantially surrounds the top surface and the compression surface. In an example, the breast compression paddle further includes a bracket or integral feature, and wherein the jacket further includes a first edge coupled to the bracket or integral feature adjacent the top surface.

In another aspect not forming part of the present invention, the technology relates to an imaging system including: an imaging source; an imaging receptor defining an imaging area; and a breast compression unit including: a breast compression paddle having a first compression surface; a platform having a second compression surface, wherein the breast compression paddle is configured to move in relation to the platform to compress a patient's breast between the first compression surface and the second compression surface; and a paddle jacket disposed on the breast compression paddle such that the first compression surface is at least partially covered, the paddle jacket including at least one inflatable chamber and a sheet, wherein the at least one inflatable chamber is configured to selectively inflate and induce the sheet to slide along the first compression surface.

In an example, the imaging system further includes a platform jacket disposed on the platform such that the second compression surface is at least partially covered, the platform jacket including at least one inflatable chamber and a sheet, wherein the at least one inflatable chamber is configured to selectively inflate and induce the sheet to slide along the second compression surface. In another example, the paddle jacket is independently inflatable from the platform jacket. In yet another example, the imaging system further includes a fluid source configured to deliver a flow of fluid to the paddle jacket for the selective inflation of the at least one inflatable chamber. In still another example, the paddle jacket is removably disposed on the breast compression paddle. In an example, the breast compression paddle is removable from the breast compression unit.

In another aspect not forming part of the present invention, the technology relates to a method of compressing a breast in an imaging system including a jacket having at least one inflatable chamber and a sheet, the method including: compressing a breast between a compression paddle and a platform; selectively inflating the at least one inflatable chamber of the jacket disposed on the breast compression paddle such that the sheet slides along a compression surface and pulls at least some breast tissue away from a patient's chest wall and into an imaging area.

In an example, the sheet includes at least one cushioning chamber disposed below the compression surface, and the method further includes after the breast is compressed between the compression paddle and the platform selectively inflating the at least one cushioning chamber. In another example, the at least one inflatable chamber is selectively inflated to a different pressure than a pressure of the at least one cushioning chamber. In yet another example, the method further includes removably attaching the jacket on the breast compression paddle; and coupling in fluid communication the jacket to a fluid source.

In another aspect not forming part of the present invention, the technology relates to a breast compression unit for an x-ray imaging system, the breast compression unit including: a support platform including a compression surface; a compression paddle movably disposed relative to the support arm such that a patient breast can be compressed between the compression paddle and the compression surface, wherein the compression paddle is angled relative to the compression surface; and a jacket including at least one inflation chamber coupled to the compression paddle, wherein the at least one inflation chamber includes an edge section disposed proximate a front surface of the compression paddle, and wherein when the at least one inflation chamber is inflated a slope of the edge section is substantially parallel to the compression surface.

In an example, the compression paddle has a bottom surface adjacent to the at least one inflation chamber, and wherein the bottom surface is substantially planar. In another example, the compression paddle has a bottom surface adjacent to the at least one inflation chamber, and wherein the bottom surface is substantially curved.

In another aspect, the technology relates to a breast compression unit for an x-ray imaging system, the breast compression unit including: a support platform including a compression surface; and a compression paddle movably coupled to the support arm, wherein the compression paddle is moveable along a first axis substantially orthogonal to the compression surface and along a second axis substantially parallel to the compression surface.

In an example, a first drive system is coupled to the compression paddle and configured to move the compression paddle along the first axis, and a second drive system is coupled to the compression paddle and configured to move the compression paddle along the second axis. In another example, the movement of the compression paddle along the first axis occurs substantially simultaneously with movement along the second axis. In yet another example, the movement of the compression paddle along the first axis is discrete from movement along the second axis.

In another aspect not forming part of the present invention, the technology relates to a breast support platform for an x-ray imaging system, the breast support platform including: a compression surface; a front surface disposed at an angle to the compression surface and configured to contact a chest wall of a patient during a compression of a breast against the compression surface; and an inflatable membrane disposed at the front surface and configured to receive a fluid and expand at least partially away from the front surface so as to form a cushioned element on the breast support platform.

In an example, the inflatable member is disposed at least partially within a recess defined by the front surface and is covered by a flexible cover. In another example, a flexible cover includes the inflatable membrane, and wherein the flexible cover is removably coupled to the front surface.

In another aspect not forming part of the present invention, the technology relates to a compression element for an x-ray imaging system, the compression element including: a structural support; and an inflatable bladder coupled to the structural support, wherein the inflatable bladder forms both a front wall and a compression surface of the compression element, and wherein the inflatable bladder is configured to receive a flow of fluid and selectively release the fluid upon compression of a patient breast.

In an example, a bleed valve is coupled to the inflatable bladder and is configured to selectively release the fluid upon compression of the patient breast. In another example, the compression element further includes a reservoir coupled in flow communication with the inflatable bladder, and wherein the fluid released from the inflatable bladder is channeled to the reservoir. In yet another example, the inflatable bladder includes one or more support tubes configured to at least partially define a shape of the front wall. In still another example, the structural support includes two or more arms.

In another aspect not forming part of the present invention, the technology relates to a method of compressing a breast for an imaging procedure on an x-ray imaging system, the method including: moving a compression element towards a support platform, wherein the compression element includes a structural support and an inflatable bladder filled with a fluid; contacting the breast with the compression element such that a compressive load is applied to the breast, and the breast compresses between the compression element and the support platform; and upon reaching a predetermined compressive force on the breast, selectively releasing at least a portion of the fluid from the inflatable bladder such that any further applied compressive load does not increase the compressive force on the breast.

In an example, the method further includes attaching the inflatable bladder to the structural support. In another example, attaching the inflatable bladder includes tensioning the inflatable bladder between a pair of arms. In yet another example, electively releasing fluid from the inflatable bladder includes bleeding air to the atmosphere. In still another example, prior to moving the compression element, the method further includes inflating the inflatable bladder with the fluid.

The present technology relates to a breast compression system having a breast compression paddle or compression support surface, an inflatable jacket, inflation control, and/or other components as described below for use in a breast imaging system. During imaging of a breast, it is often desirable to immobilize the breast through compression. For instance, by compressing the breast, the breast can be made thinner, thus requiring a lower dose of radiation. Further, by immobilizing the breast, image blurring from movement of the breast during imaging is reduced. Other benefits may also be realized by compressing the breast. The paddle commonly used to compress the breast, however, may cause distortions in the imaging process. For instance, during compression, the breast tissue may become rolled or folded, or may be pushed into the chest wall, thereby changing the profile of the compressed breast.

The paddle may also cause discomfort to the patient whose breast is being compressed. One reason for discomfort that the patient may feel is that the compression force is non-uniformly distributed throughout the breast. It is often concentrated at the thickest portion of the breast, usually near the chest wall, at or near the lower front edge of the compression paddle and the upper front corner of the breast platform. The anterior portion of the breast, such as near the nipple, may receive less compressive force, or no compressive force. The paddle may not even contact this portion of the breast. Other reasons for discomfort may be over-compression of the breast by the paddle. (The terms front, lower, and upper pertain to using a craniocaudal (CC) imaging orientation, with the patient facing the front of the imaging system, although it should be understood that other imaging orientations, including mediolateral oblique (MLO), are used with the same equipment.

To improve these issues relating to the compression systems, the compression systems described herein include an inflatable jacket that is positioned over a compression surface and is configured to receive a flow of fluid so as to selectively inflate or deflate. During breast compression, the jacket is selectively inflated so as to pull breast tissue away from the chest wall and into the imaging area. Additionally, the jacket reduces rolling and folding of the breast tissue so as to maintain a more desirable breast profile. In one example, the breast compression occurs substantially simultaneously with the inflation of the jacket. The inflatable jacket provides more comfort to the patient during breast compression because the pulling sensation is reduced while increasing the volume of breast tissue within the imaging area. After breast compression, the jacket may further be selectively inflated so as to reduce breast tissue wrinkling and provide further comfort to the patient while the breast is imaged.

Additionally, the technologies described herein provide compression systems that reduce breast tissue being pushed into the chest wall so that as much breast tissue as possible is pulled into the imaging area. This can be enabled by angling the compression paddle that the inflatable jacket is coupled to. Additionally or alternatively, fluid flow may be directed to an inflatable membrane that is positioned on a front wall of the support platform so that a cushioned support may be provided to the patient. This increases overall patient comfort during imaging procedures. Moreover, an inflatable bladder on the compression paddle may be used to decrease over-compression of the patient's breast. For example, during the compression procedure, the bladder may be selectively inflated or deflated so that the compressive force induced on the breast is limited to a predetermined value. This also increases overall patient comfort during imaging procedures. Further technologies described herein include a mechanical system that pulls breast tissue away from the chest wall and into the imaging area without the need of a flow of fluid and an inflatable jacket.

<FIG> is a schematic view of an exemplary imaging system <NUM>. <FIG> is a perspective view of the imaging system <NUM>. Referring concurrently to <FIG> and <FIG>, the imaging system <NUM> immobilizes a patient's breast <NUM> for x-ray imaging (either or both of mammography and tomosynthesis) via a breast compression immobilizer unit <NUM> that includes a static breast support platform <NUM> and a moveable compression paddle <NUM>. The breast support platform <NUM> and the compression paddle <NUM> each have a compression surface <NUM> and <NUM>, respectively, and at least one compression surface move towards the other, to compress and immobilize the breast <NUM>. In the example, both the platform <NUM> and the paddle <NUM> include an inflatable jacket <NUM>, which is described further below in reference to <FIG>. In other examples, only one of the platform <NUM> or the paddle <NUM> may include the inflatable jacket <NUM>. When no inflatable jacket <NUM> is utilized, the compression surface <NUM>, <NUM> is exposed so as to directly contact the breast <NUM>. The platform <NUM> also houses an image receptor <NUM> and, optionally, a tilting mechanism <NUM>. The immobilizer unit <NUM> is in a path of an imaging beam <NUM> emanating from x-ray source <NUM>, such that the beam <NUM> impinges on the image receptor <NUM>.

The immobilizer unit <NUM> is supported on a first support arm <NUM> and the x-ray source <NUM> is supported on a second support arm <NUM>. For mammography, support arms <NUM> and <NUM> can rotate as a unit about an axis <NUM> between different imaging orientations such as CC and MLO, so that the system <NUM> can take a mammogram projection image at each orientation. In operation, the image receptor <NUM> remains in place relative to the platform <NUM> while an image is taken. The immobilizer unit <NUM> releases the breast <NUM> for movement of arms <NUM>, <NUM> to a different imaging orientation. For tomosynthesis, the support arm <NUM> stays in place, with the breast <NUM> immobilized and remaining in place, while at least the second support arm <NUM> rotates the x-ray source <NUM> relative to the immobilizer unit <NUM> and the compressed breast <NUM> about the axis <NUM>. The system <NUM> takes plural tomosynthesis projection images of the breast <NUM> at respective angles of the beam <NUM> relative to the breast <NUM>.

Concurrently and optionally, the image receptor <NUM> may be tilted relative to the breast support platform <NUM> and coordinated with the rotation of the second support arm <NUM>. The tilting can be through the same angle as the rotation of the x-ray source <NUM>, but may also be through a different angle selected such that the beam <NUM> remains substantially in the same position on the image receptor <NUM> for each of the plural images. The tilting can be about an axis <NUM>, which can but need not be in the image plane of the image receptor <NUM>. The tilting mechanism <NUM> that is coupled to the image receptor <NUM> can drive the image receptor <NUM> in a tilting motion. For tomosynthesis imaging and/or CT imaging, the breast support platform <NUM> can be horizontal or can be at an angle to the horizontal, e.g., at an orientation similar to that for conventional MLO imaging in mammography. The system <NUM> can be solely a mammography system, a CT system, or solely a tomosynthesis system, or a "combo" system that can perform multiple forms of imaging. An example of such a combo system is been offered by the assignee hereof under the trade name Selenia Dimensions.

When the system is operated, the image receptor <NUM> produces imaging information in response to illumination by the imaging beam <NUM>, and supplies it to an image processor <NUM> for processing and generating breast x-ray images. A fluid control unit <NUM> connects with the compression paddle <NUM> and the platform <NUM> to selectively provide fluid air into the jackets <NUM> and increase breast tissue drawn into the imaging during breast compression and comfort of the patient, as described herein. The fluid control unit <NUM> can be powered by an operator, using a hand-pump or a foot pump and appropriate manual or foot-controlled valves, or alternatively, electric or fluid-powered pumps can be used, with appropriate valves and interfaces such as buttons or switches that the operator controls. In another example, the fluid control unit <NUM> is automatically controlled by one or more sensors, such as position sensors and pressure sensors, in or on the compression paddle <NUM>, platform <NUM>, inflatable jackets <NUM>, and/or any other component and software that may enable the user to control the system. In an example, the fluid control unit <NUM> connects via a quick-release snap-on connection <NUM>, or the like, to the inflatable jacket <NUM> so as to provide a flow of fluid thereto. A system control and work station unit <NUM> including software controls the operation of the system and interacts with the operator to receive commands and deliver information including processed-ray images. In some examples, the paddle jacket <NUM> is independently inflated from the platform jacket <NUM>.

One challenge with the imaging system <NUM> is how to immobilize and compress the breast <NUM> for the desired or required imaging. A health professional, typically an x-ray technologist, generally adjusts the breast <NUM> within the immobilizer unit <NUM> while pulling tissue towards imaging area and moving the compression paddle <NUM> toward the breast support platform <NUM> to immobilize the breast <NUM> and keep it in place, with as much of the breast tissue as practicable being between the compression surfaces <NUM>, <NUM>. However, it may be desirable to further compress or otherwise act on the breast <NUM> so that breast tissue can be pulled away from the patient's chest wall and securely retained in the immobilizer unit <NUM> for imaging. Accordingly, and for increasing patient comfort and breast compression profile, the breast support platform <NUM> and the compression paddle <NUM> includes the inflatable jacket <NUM> that has at least one inflatable chamber to enable breast tissue to be pulled away from the chest wall during breast compression in order to obtain a desired breast compression profile and provide a greater amount of compression comfort to the patient. These breast compression systems are described in further detail below.

<FIG> illustrate an exemplary breast compression system <NUM>. Referring concurrently to <FIG>, the breast compression system <NUM> may be utilized as a breast compression paddle or a breast support platform. The breast compression system <NUM> includes body <NUM> defined by a top surface <NUM> and an opposite bottom surface <NUM>. In general, surfaces of the breast compression system <NUM> are described as depicted in the figures (e.g., "top," bottom," etc.). These general terms are utilized for clarity and only to distinguish the various surfaces from each other. For instance, in <FIG>, the top surface <NUM> is a non-compression surface while the bottom surface <NUM> is a compression surface. The body <NUM> is also defined by a front surface <NUM>, a left surface <NUM>, and a right surface <NUM>. In the example, the body <NUM> is hollow and may be manufactured from a material that is designed to cause minimal interference with the radiation beam passing through the breast compression system <NUM>, such as a radiolucent material. For example, the body <NUM> may be made from a polycarbonate material, a carbon fiber material, or other similar materials. In alternative examples, the body <NUM> may be solid, or partially filled. Additionally, in alternative examples, the body <NUM> may have an open top surface <NUM>, for example, as illustrated by the compression paddle <NUM> (shown in <FIG>).

In the example, the body <NUM> is coupled to a bracket <NUM> positioned opposite the front surface <NUM>. The bracket <NUM> includes an end <NUM> that is received within an interior chamber <NUM> of the body <NUM>, or that may be secured to an end thereof. An extension <NUM> extends from the end <NUM> and away from the body <NUM>. The extension <NUM> is configured to be removably attached to a compression assembly of an imaging system. The bracket <NUM> may also include an inlet port <NUM> disposed on the top of the bracket <NUM> that is in fluidic communication with the interior chamber <NUM>. Optionally, heated fluid, such as warm air or gas, may be injected into the interior chamber <NUM> via the inlet port <NUM> to warm the breast compression system <NUM> before and/or during contact with the breast. In alternative examples, the body <NUM> may be integral with the bracket <NUM> so that the breast compression system <NUM> has a first portion (e.g., the bottom surface <NUM>) that forms a breast compression surface and an integral opposite second portion that enables the system <NUM> to be removably attached to the compression assembly, for example, as illustrated by the compression paddle <NUM> (shown in <FIG>).

The breast compression system <NUM> also includes a jacket <NUM>. In the example, the jacket <NUM> is removably coupled to the bracket <NUM> and substantially surrounds the top surface <NUM>, front surface <NUM>, and bottom surface <NUM> of the body <NUM>. In alternative examples, if the body includes an open top surface, the jacket <NUM> substantially surrounds the front surface and the bottom surface. <FIG> illustrate the jacket <NUM> in a deflated configuration, however, the jacket <NUM> may be actuated, via selective inflation, so that it may slide relative to the bottom surface <NUM> so as to pull breast tissue away from the chest wall and into the imaging area to obtain a desired breast compression profile. More specifically, the jacket <NUM> includes a first end <NUM> that is coupled to the top of the bracket <NUM> with one or more connection elements <NUM>. For example, the connection element <NUM> may include an elongated slot <NUM> defined in the first end <NUM> such that a corresponding projection <NUM> of the bracket <NUM> is received therein. The elongated slot <NUM> enables the first end <NUM> to slide towards the front surface <NUM> while still being coupled to the bracket <NUM>. This allows the jacket <NUM> to slide in relation to the body <NUM>. In other examples, the first end <NUM> may include elastic material that enables the jacket <NUM> to slide in relation to the body <NUM>. A second end <NUM> of the jacket <NUM> is coupled to the bottom of the bracket <NUM> with one or more connection elements <NUM>. Unlike the first end <NUM>, the second end <NUM> is secured to the bracket <NUM> such that the second end <NUM> does not move relative to the bracket <NUM>.

The jacket <NUM> also includes at least one inflatable chamber <NUM> that is disposed below a recess <NUM> defined on the bottom of the bracket <NUM> and adjacent to the bottom surface <NUM>. Each chamber of the inflatable chamber <NUM> may be selectively and/or independently inflated as described further below. Additionally, the jacket <NUM> includes a sheet <NUM> disposed below the bottom surface <NUM>. The sheet <NUM> is positioned adjacent to the inflatable chamber <NUM> and separated by a heat-sealed seam <NUM>. The inflatable chamber <NUM> is configured to selectively inflate into the recess <NUM> and pull on the first end <NUM> to slide the sheet <NUM> along the bottom surface <NUM> towards the bracket <NUM>. This sliding movement of the sheet <NUM> pulls breast tissue away from the chest wall and into an imaging area and controls the profile of the breast, for example, a nipple profile position. The imaging area may be defined as an area below the compression paddle and above the imaging receptor and is depicted generally in <FIG> as element <NUM>. With the inflatable chamber <NUM> below the bracket <NUM>, the inflatable chamber <NUM> and the seam <NUM> are positioned outside of the imaging area of the imaging receptor so as to reduce and eliminate imaging artifacts.

In some examples, the sheet <NUM> includes one or more cushioning chambers <NUM> disposed below the bottom surface <NUM> and extending along at least a portion of the front surface <NUM>. Each chamber of the cushioning chamber <NUM> may be selectively and/or independently inflated as described further below. The cushioning chamber <NUM> is configured to provide comfort to the patient during breast compression. For example, the cushioning chamber <NUM> may be an inflatable chamber that is controlled independent of the inflatable chamber <NUM>. In an example, the cushioning chamber <NUM> is selectively inflatable to a lower pressure than the pressure in the inflatable chamber <NUM>. The jacket <NUM> may be manufactured from a thin-film flexible material such as a polyurethane material that has a high tensile strength and limited stretching characteristics when surrounding the body <NUM>. Additionally, the material is advantageously disposable. As such, after use with a first patient, the jacket <NUM> may be removed and a new jacket may be applied for a subsequent patient. This may reduce the need to clean or otherwise treat the surface of the breast compression system <NUM> between patients.

<FIG> is a schematic view of the breast compression system <NUM> in an inflated configuration. The jacket <NUM> may be coupled in flow communication to a fluid source <NUM> of the imaging system that is configured to deliver a flow of fluid to the jacket <NUM> and selectively inflate the inflatable chamber <NUM> and/or the cushioning chamber <NUM>. The inflatable chamber <NUM> and the cushioning chamber <NUM> can be selectively inflated and, if desired, selectively deflated, to a pressure as required or desired via the fluid source <NUM>. For example, the fluid may be air or any other gas or liquid that enables the jacket <NUM> to function as described herein. In operation, as the breast compression system <NUM> is compressing the patient's breast, the inflatable chamber <NUM> is being selectively inflated via the fluid source <NUM>. The inflatable chamber <NUM> inflates and expands into the bracket recess <NUM>. This inflation induces the sheet <NUM> to slide <NUM> along the bottom surface <NUM>, and the sliding movement <NUM> of the jacket <NUM> pulls the breast tissue away from the chest wall so as to reduce a pulling sensation felt by the patient. In some examples, the inflation occurs substantially simultaneously with the compressing of the breast.

When the cushioning chamber <NUM> is used, the cushioning chamber <NUM> may be selectively inflated or deflated along with the inflatable chamber <NUM> so as to provide additional comfort for the patient and further reduce the pulling sensation. In some examples, the cushioning chamber <NUM> is inflated to a lower pressure than that of the inflatable chamber <NUM> because too much pressure of the cushioning chamber <NUM> may push breast tissue out from the imaging area. In other examples, the inflation of the cushioning chamber <NUM> is independently controlled from the inflation of the inflatable chamber <NUM>. After the simultaneous inflation of the inflatable chamber <NUM> and the cushioning chamber <NUM>, the inflatable chamber <NUM> and/or the cushioning chamber may further be selectively inflated or deflated to adjust the profile of the breast and/or nipple if desired. In yet other examples, after the breast is compressed, the cushioning chamber <NUM> is only then selectively inflated or deflated.

<FIG> are schematic side views of an exemplary inflatable jacket <NUM> in a deflated condition <NUM>, a first inflated condition <NUM>, and a second inflated condition <NUM>, respectively. Referring concurrently to <FIG>, a patient's breast <NUM> is positioned between a breast support platform <NUM> and a compression paddle <NUM> that both include inflatable jackets <NUM>. The jacket <NUM> includes a plurality of cushioning chambers <NUM> positioned over and at least partially cover compression surfaces <NUM> and <NUM> of the breast support platform <NUM> and the compression paddle <NUM>, respectively. The jacket <NUM> also includes a plurality of inflatable chambers <NUM> adjacent to the compression surface <NUM>, <NUM>. In the example, the jacket <NUM> on the platform <NUM> is similar to the jacket <NUM> on the paddle <NUM>. In alternative examples, the jackets <NUM> may be different on the platform <NUM> and the paddle <NUM>. The inflatable chambers <NUM> are positioned adjacent to a bracket end <NUM> of the compression surfaces <NUM>, <NUM> while the cushioning chambers <NUM> are positioned adjacent to a front surface <NUM> of the compression surfaces <NUM>, <NUM> and in contact with the breast <NUM>. In the example, the compression paddle <NUM> has an open top surface and the bracket end <NUM> is integral with the compression surface <NUM> and the front surface <NUM>.

Referring to <FIG>, the patient's breast <NUM> is positioned on the breast support platform <NUM>, and the compression paddle <NUM> is located above the breast <NUM> so as to restrict movement. The jackets <NUM> cover both compression surfaces <NUM>, <NUM>, and the cushioning chambers <NUM> and the inflatable chambers <NUM> are deflated before compression begins. For imaging, it is desirable to pull breast tissue away from the chest wall and control the profile of the breast <NUM> (e.g., nipple region <NUM> position). As such, the health professional may manually manipulate the profile of the breast <NUM> before compressing the breast. However, during compression, in the absence of the inflatable jacket <NUM>, breast tissue may be pushed towards the chest wall and the nipple region <NUM> may move and roll so as to change the profile of the breast <NUM>.

Accordingly, as the compression paddle <NUM> is moved toward the platform <NUM> and compresses the breast <NUM>, each jacket <NUM> is selectively inflated so as to pull breast tissue away from the chest wall and into an imaging area <NUM> and control the profile of the breast <NUM>. Turning to <FIG>, in the first inflated position <NUM>, the inflatable chambers <NUM> begin to inflate by receiving a flow of fluid. When the inflatable chambers <NUM> selectively inflate, the jacket <NUM> slides along the compression surfaces <NUM>, <NUM> and away from the chest wall as illustrated by arrows <NUM>. As such, breast tissue is pulled further into the imaging area <NUM>. Additionally, the nipple region <NUM> profile is maintained so it does not roll or fold in undesirable directions (e.g., the nipple region rolling in a downward direction). In some examples, by substantially simultaneously compressing the breast <NUM> and pulling breast tissue away from the front surfaces <NUM>, any pulling sensation experienced by the patient is reduced. In this example, the inflatable chambers <NUM> in each jacket <NUM> are selectively inflated at approximately the same rate and at the same time so as to act in concert and slide the jacket <NUM> along the compression surfaces <NUM>, <NUM>. In alternative examples, the inflatable chambers <NUM> in a single jacket <NUM> or in each jacket <NUM> may be independent chambers and selectively inflate at different rates and/or time sequences. Additionally, by using multiple inflatable chambers, the left and right edges of the jacket <NUM> do not pull as far into the image area <NUM> when the chambers are inflated. When large chambers are inflated, the middle section tends to rise, while the end sections tend to draw inwards and into the imaging area.

Referring to <FIG>, the breast <NUM> is compressed and the inflatable chambers <NUM> are inflated so that breast tissue is pulled into the imaging area <NUM> and the nipple region <NUM> profile is maintained. Additionally, after breast compression, the cushioning chambers <NUM> may be selectively inflated or deflated so as to increase comfort of the patient and to reduce wrinkling of the breast tissue. The cushioning chambers <NUM> can be inflated to a lower pressure so as to not push breast tissue towards the chest wall and out of the imaging area <NUM>. In the example, the inflation pressure of the inflatable chambers <NUM> is greater than the inflation pressure of the cushioning chambers <NUM>. In alternative examples, these inflation pressures may be equal or the cushioning chambers <NUM> greater than the inflatable chambers <NUM>.

Additionally, in some examples, the cushioning chambers <NUM> may inflate in concert with the inflatable chambers <NUM> during the breast compression and then be selectively adjusted after the breast compression. Alternatively, in other examples, breast compression may begin without inflation of the jacket <NUM> up to a predetermined compression value, and then the jacket <NUM> may be selectively inflated before finishing breast compression to the final compression value.

<FIG> is a flowchart of a method <NUM> for compressing a breast in an imaging system. In this example, the imaging system includes a jacket having at least one inflatable chamber and a sheet. The method includes compressing a breast between a compression paddle and a platform (operation <NUM>). The at least one inflatable chamber of the jacket disposed on the breast compression paddle is selectively inflated such that the sheet slides along a compression surface and pulls at least some breast tissue away from a patient's chest wall and into an imaging area (operation <NUM>).

Additionally, the sheet may include at least one cushioning chamber disposed below the compression surface, so that the method <NUM> further includes after the breast is compressed between the compression paddle and the platform, selectively inflating the at least one cushioning chamber (operation <NUM>). The at least one inflatable chamber can be inflated to a different pressure than a pressure of the at least one cushioning chamber (operation <NUM>). The method <NUM> may also include removably attaching the jacket on the breast compression paddle (operation <NUM>), and coupling in fluid communication the jacket to a fluid source (operation <NUM>).

<FIG> and <FIG> are side views of another breast compression system <NUM>. With reference first to <FIG>, a compression paddle <NUM> and/or the platform (not shown) are supported such that they extend substantially horizontally <NUM> from the support arm (not shown for clarity). This provides for a generally flat bottom surface <NUM> for breast <NUM> compression therebetween. However, when an inflatable jacket <NUM> is coupled to the compression paddle <NUM>, an inflatable chamber <NUM> inflates proximate a central area <NUM> of the inflatable jacket <NUM>. This ballooning effect causes a greater separation Si between the central area <NUM> of the jacket <NUM> and the compression paddle <NUM>, with less separation S<NUM> between an edge section <NUM> of the jacket <NUM> and the compression paddle <NUM>. This may push breast tissue out along the edge sections <NUM> of the inflatable jacket <NUM>. When the edge sections <NUM> are adjacent to the front of the patient's breast (e.g., the nipple region) or the sides of the patient's breast, the balloon effect further assists in flattening the breast <NUM> during compression procedures. However, at the chest wall edge, the balloon effect may push breast tissue towards the chest wall <NUM> as illustrated by arrows <NUM>, which is undesirable for imaging. As such and now with reference to <FIG>, to reduce the balloon effect along the chest wall, the compression paddle <NUM> of the breast compression system <NUM> is positioned at an angle <NUM> relative to the horizontal axis <NUM>.

Similar to the examples described above, the compression paddle <NUM> includes the bottom surface <NUM> and a front surface <NUM>. The compression paddle <NUM> can be coupled to a support arm by a bracket (not shown) and the support arm generally extends along a vertical axis <NUM> that is substantially orthogonal to the horizontal axis <NUM>. Additionally, the inflatable jacket <NUM> can be coupled to the compression paddle <NUM> and adjacent to the bottom surface <NUM> and the front surface <NUM>. In examples, the jacket <NUM> may be at least partially disposed around the compression paddle <NUM>. In this example, the inflatable jacket <NUM> includes at least one inflation chamber <NUM> that is proximate the bottom surface <NUM> that is angled relative to the horizontal axis <NUM>. As illustrated in <FIG>, the entire compression paddle <NUM> is angled and the bracket can define the extension angle from the support arm. As such, the bottom surface <NUM> is substantially planar. In other examples, the compression paddle <NUM> may have a bottom surface <NUM> that has at least one curve defined therein such that the front surface <NUM> is positioned at an angle.

The inflation chamber <NUM> is configured to selectively inflate (e.g., through a flow of compressed air or any other fluid) to provide cushioning to the patient's breast and/or to provide further compressive force to the breast. When the inflation chamber <NUM> is inflated, the central area <NUM> of the chamber <NUM> expands more than the edge sections <NUM>. This ballooning effect generates a substantially domed-shaped outer surface <NUM> of the inflation chamber <NUM>, while an inner surface <NUM> of the inflation chamber <NUM> remains substantially flat due to the bottom surface <NUM> of the compression paddle <NUM>. The domed-shaped outer surface <NUM> forms a sloped or tapered edge section <NUM> that is proximate the edge <NUM>. In this example, the compression paddle <NUM> is angled <NUM> such that the sloped section <NUM> is oriented substantially parallel to the horizontal axis <NUM>.

By angling the compression paddle <NUM> in a downward direction towards the patient's chest wall, the ballooning effect of the inflation chamber <NUM> along the patient's chest wall is reduced or eliminated. That is, the angled compression paddle <NUM> orients the sloped section <NUM> of the inflation chamber <NUM> substantially parallel to the support platform so that breast compression along the chest wall is substantially along the vertical axis <NUM> and pushing of breast tissue towards the chest wall is reduced or eliminated. This pulls as much breast tissue as possible is pulled into the imaging area of the x-ray system and maintains a more desirable breast compression profile to increase imaging efficiencies.

<FIG> is a schematic view of another imaging system <NUM>. Similar to the example described above in <FIG> and <FIG>, the imaging system <NUM> includes an x-ray tube head <NUM> and a support platform <NUM>. Additionally, a compression paddle <NUM> is disposed between the x-ray tube head <NUM> and the support platform <NUM>. The compression paddle <NUM> is configured to immobilize a patient's breast against the support platform <NUM> for x-ray imaging. In the examples of <FIG>, to maintain a more desirable breast profile for imaging and prevent rolling or folding of breast tissue, an inflatable jacket can be used. In the example of <FIG>, however, an extension/retraction drive system <NUM> is coupled to the compression paddle <NUM> to mechanically pull breast tissue away from the chest wall and into the imaging area during the compression procedure. The extension/retraction drive system <NUM> may be any type of electro-mechanical system that enables movement of the compression paddle as described herein. For example, the drive system <NUM> may be a geared system, a pulley system, or a combination thereof. In other examples, the drive system <NUM> may be a piston movement system or a solenoid actuator.

A support arm <NUM>, which supports the platform <NUM> and the compression paddle <NUM>, houses a vertical drive system <NUM> that is coupled to the paddle <NUM>. The vertical drive system <NUM> is configured to move compression paddle <NUM> towards the support platform <NUM> and compress the patient's breast for imaging. This vertical movement defines a first axis that is substantially orthogonal to the compression surface of the support platform <NUM>. Additionally, the compression paddle <NUM> is coupled to the extension/retraction drive system <NUM> such that the paddle <NUM> also can be extended and/or reacted with respect to the support arm <NUM>. This horizontal movement defines a second axis that is substantially parallel to the compression surface of the support platform <NUM>. Accordingly, during a breast compression procedure, the compression paddle <NUM> may be extended <NUM> away from the support arm <NUM> along the first axis before moving <NUM> the compression paddle <NUM> towards the support platform <NUM> along the second axis. Then, as the compression paddle <NUM> is compressing the patient's breast, the compression paddle <NUM> may be retracted <NUM> towards the support arm <NUM> along the first axis to draw breast tissue away from the chest wall of the patient. The compression movement <NUM> and the retraction movement <NUM> of the compression paddle <NUM> may occur substantially simultaneously. In other examples, the compression movement <NUM> and the retraction movement <NUM> may be discrete movements that occur individually.

By mechanically pulling breast tissue away from the chest wall and into the imaging area via the compression paddle <NUM> and the drive systems <NUM>, <NUM>, the system <NUM> reduces rolling and folding of breast tissue so as to maintain a more desirable breast profile and increase imaging efficiencies. Additionally, by substantially simultaneously compressing and pulling the patient's breast, the drive systems <NUM>, <NUM> enables the pulling sensation experienced by the patient to be reduced, thereby increasing patient comfort.

<FIG> are a perspective view and a side view, respectively, of a support platform <NUM>. Referring concurrently to <FIG> and as described above, the support platform <NUM> includes a top compression surface <NUM> to facilitate breast compression. The support platform <NUM> also houses the image receptor and tilting mechanism (not shown). During breast compression and imaging procedures, the patient is positioned such that the chest wall is pressed against a front surface <NUM> of the support platform. The front surface <NUM> is typically disposed at an angle (e.g., a <NUM>° angle) to the compression surface <NUM>. This position may cause some discomfort for the patient, as the support platform <NUM> is typically a hard rigid plastic housing. As such, in this example, the support platform <NUM> includes an inflatable membrane <NUM> disposed along the front surface <NUM>. The inflatable membrane <NUM> is configured to selectively inflate and provide a cushioned surface on the support platform <NUM> such that the patient is more comfortable during the compression and imaging procedures.

A recess <NUM> is defined in the front surface <NUM> of the support platform <NUM> such that the inflatable membrane <NUM> can be disposed along the front surface <NUM>. In other examples, the recess <NUM> can be a cutout, opening, slot, etc. as required or desired. This position enables the image receptor and tilting mechanism to maintain a clearance fit within the support platform <NUM> and positions the inflatable membrane <NUM> out of the imaging area such that no image artifacts are formed. When inflated, the inflatable membrane <NUM> extends out from the front surface <NUM> such that a cushion is provided for the patient. When the inflatable membrane <NUM> is not inflated, the inflatable membrane <NUM> can retract within the support platform <NUM>. A flexible cover <NUM> may be positioned over the front surface <NUM> and the inflatable membrane <NUM> and is configured to expand and retract with the inflation of the inflatable membrane <NUM>. The flexible cover <NUM> may be removable and/or disposable so that the support platform <NUM> can be easily cleaned and disinfected before patient use. In other examples, the inflatable membrane <NUM> may be exposed to patient contact and configured to be cleaned with disinfectant between patients.

In operation, the inflatable membrane <NUM> may be coupled in fluid communication to a fluid control unit such that during the compression procedure the inflatable membrane <NUM> is inflated to provide a cushioned element on the support platform <NUM>. The inflatable membrane <NUM> may be filled to a predetermined pressure for every compression procedure or may be filled to varying pressure based on the imaging procedure or patient comfort level. By providing a cushioned surface on the support platform <NUM> that can easily be cleaned and re-pressurized, the technologist no longer has to work with foam pads that may be difficult to clean. Additionally, a heated fluid may be channeled to the inflatable membrane <NUM> such that the support platform <NUM> is at least partially heated for patient comfort. The fluid that is channeled to the inflatable membrane <NUM> can be a liquid, such as water and the like, or may be a gas, such as air and the like. In alternative examples, any other fluid or fluid compound may be used as required or desired.

In other examples, the inflatable membrane <NUM> may be combined with the flexible cover <NUM> as a removable inflatable jacket. The jacket may be coupled to a fluid source such that the inflatable membrane <NUM> can fill with fluid and expand. In this example, the front surface <NUM> of the support platform <NUM> is flat such that the inflatable membrane <NUM> can inflate and extend away from the front surface <NUM> and provide a cushioned surface on the support platform <NUM> as described herein. By using the inflatable jacket, after a compression and imaging procedure, the jacket can be disposed of so as to facilitate an easy and quick cleaning of the image system between patients.

The inflatable membrane <NUM> described herein enables a cushioned support to be positioned on the support platform <NUM> for increasing overall patient comfort during breast compression and imaging procedures. For example, the cushion enables the patient to be in the compressed position for longer periods of time and with lest movement to increase efficiency of the compression and imaging procedure. The inflatable member <NUM> is positioned on the front wall of the support platform <NUM> so that a cushion is provided at the chest wall of the patient and without introducing image artifacts into the imaging area. The inflatable member <NUM> can be selectively inflated based on patient needs and desires. Furthermore, the inflatable member <NUM> may receive a heated fluid flow to further increase patient comfort during breast compression and imaging procedures.

<FIG> is a side view of a breast compression element <NUM>. As described above, the imaging technologist typically adjusts the patient's breast within the compression unit while moving the compression paddle towards the support platform. This compression of the patient's breast generally must be done with sufficient force to immobilize the breast and to spread out the breast tissue for x-ray imaging, and as such, over-compression may occur, which increases patient discomfort and anxiety during the imaging procedure. Accordingly, the breast compression element <NUM> described below may be used with the imaging systems described herein to provide increased comfort to the patent, while still enabling for sufficient immobilization and shaping of the patient's breast.

In this example, the compression element <NUM> includes a structural support <NUM> and an inflatable bladder <NUM> coupled thereto. The structural support <NUM> is formed from a rigid, radiotranslucent material that can be removably coupled to the compression assembly. On the bottom side (e.g., forming the bottom surface of the support <NUM>), the inflatable bladder <NUM> is positioned. The inflatable bladder <NUM> is configured to receive and store a fluid, such that the inflatable bladder <NUM> can be pressurized to a predetermined pressure. Additionally, a bleed valve <NUM> is in fluid communication with the inflatable bladder <NUM>. The bleed valve <NUM> is configured to selectively de-pressurize and release fluid from the inflatable bladder <NUM> as required or desired such that over-compression of the patient's breast may be reduced or eliminated.

In one example of operation, the inflatable bladder <NUM> may be initially filled with a fluid <NUM> such that the inflatable bladder <NUM> is formed to an inflated shape and/or pressure. As the compression element <NUM> moves towards the support platform and compresses the patient's breast, the rigid structural support <NUM> generates a compressive force on the breast. The bleed valve <NUM> selectively releases fluid <NUM> from the inflatable bladder <NUM>. The bleed valve <NUM> is configured to at least partially open when the fluid pressure in the inflatable bladder <NUM> reaches a predetermined value. Additionally or alternatively, the bleed rate of the valve <NUM> may be controllable so as to define the fluid pressure within the inflatable bladder <NUM>. Thus, the compressive force applied to the patient breast by the structural support <NUM> can be at least partially dissipated by the inflatable bladder <NUM> and fluid <NUM> configuration. This enables the technologist to apply compression force sufficient to immobilize and compress the breast without overcompressing and causing unnecessary discomfort. In this way, the inflatable bladder <NUM> acts as a cushioning component disposed between the patient's breast and the structural support <NUM> that at least partially defines a compression load to be applied to the breast. The inflatable bladder <NUM> may receive a reload charge of fluid <NUM> between patients. The inflatable bladder <NUM> may be manufactured from a silicon-based, vinyl-based, or like material that is radiotranslucent and can be easily cleaned and/or disinfected.

In some examples, the fluid <NUM> may be air or an equivalent gas that can be discharged to the atmosphere by the bleed valve <NUM>. The bleed valve <NUM> may include a muffler or any other type of device that reduces or eliminates the sound of the air exiting out of the bleed valve <NUM>. In other examples, an exit tube (not shown) may extend from the bleed valve <NUM> so as to channel the air to a remote discharge location away from the patient. In further examples, a reservoir <NUM> may be coupled in flow communication with the inflatable bladder <NUM> and on the opposite side of the bleed valve <NUM> so as to receive the discharged fluid <NUM>. In this example, the bleed valve <NUM> may be a two-way valve such that the fluid <NUM> can be introduced to and removed from the inflatable bladder <NUM>. The reservoir <NUM> may be defined at least partially within the structural support <NUM>, as illustrated in <FIG>, or may be remote from the compression element <NUM> and coupled together via one or more tubes. In still other examples, the fluid <NUM> may be water or an equivalent liquid as required or desired, although post-imaging image processing would be acquired to address attenuation. The fluid <NUM> may also be heated so that the inflatable bladder <NUM> is warm and more calming for the patient.

Since both the structural support <NUM> and the inflatable bladder <NUM> are used to compress the patient's breast, the structural support <NUM> may have a thickness <NUM> that is thinner than a typical compression paddle. This reduced thickness enables for a lower amount of x-ray energy to be used for imaging since there is less penetrable structure for the x-rays. Additionally, in this example, a front wall <NUM> of the compression element <NUM> is formed entirely by the inflatable bladder <NUM>, which provides cushioning at the chest wall <NUM> of the patient, and a compression surface <NUM> is formed by the inflatable bladder <NUM>. The structural support <NUM> is offset <NUM> from the front wall <NUM> such that the inflatable bladder <NUM> fills the space. Furthermore, the inflatable bladder <NUM> may define one or more radii <NUM> along the front wall <NUM> such that the compression element <NUM> has smooth edges that are positioned adjacent the chest wall <NUM> to further provide cushioning and patient comfort. The radius <NUM> may be formed by the shape and/or size of the inflatable bladder <NUM>, or may be at least partially defined by one or more support tubes <NUM> disposed within the inflatable bladder <NUM> so as to give shape and/or structure to the flexible bladder <NUM>.

In another example of operation, the inflatable bladder <NUM> may not be initially filled, or only partially filled, with the fluid <NUM>. In this configuration, the compression element <NUM> is moved towards the support platform and compresses the patient's breast, via the structural support <NUM>, to an initial compression force. Once this initial compression force is reached, then fluid <NUM> may be introduced into the inflatable bladder <NUM> so as to increase the pressurization of the bladder <NUM> and further compress the patient's breast until a final compression force is reached. This operation can also reduce over-compression of the breast because the compression element <NUM> is not moved in relation to the support platform in order obtain the final breast compression force. In some examples, the inflatable bladder <NUM> may be coupled to the structural support <NUM> such that a single compression element <NUM> component is formed. In other examples, the inflatable bladder <NUM> may be removably attached to the structural support <NUM> so that inflatable bladder <NUM> is a disposable component. In that case, a new inflatable bladder <NUM> may be attached for each patient.

<FIG> are a perspective view, a side cross-sectional view, a top view, and a front view, respectively, of another breast compression element <NUM>. Referring concurrently to <FIG>, the breast compression element <NUM> is disposed above a support platform <NUM> and includes a structural support <NUM> and an inflatable bladder <NUM>. Similar to the examples described above, the inflatable bladder <NUM> is coupled to a bleed valve <NUM> such that a fluid <NUM> (e.g., air) can be exhausted to the atmosphere via an outlet <NUM> and control over-compression of the breast <NUM>. Additionally, the inflatable bladder <NUM> includes an inlet <NUM> so that fluid <NUM> may be introduced into the bladder <NUM>. However, in this example, the structural support <NUM> includes two substantially parallel arms <NUM> that are spaced apart from each other. The inflatable bladder <NUM> may be formed as a sheet with two end chambers <NUM> that can receive the arm <NUM> so as to removably couple the inflatable bladder <NUM> to the arms <NUM>. This enables the inflatable bladder <NUM> to be formed as a sterile and disposable component.

In this example, it may be desirable that the inflatable bladder <NUM> be in tension between the arms <NUM> so that a compressive load can be applied to the breast <NUM>. As such, the arms <NUM> should be sufficiently rigid (e.g., carbon fiber, aluminum, or the like), and may also be moveable towards and away from one another. For example, the arms <NUM> can move towards each other and towards a first distance <NUM> that enables the inflatable bladder <NUM>, through the chambers <NUM>, to be more easily attached to the structural support <NUM> and without tensioning the bladder <NUM>. Once the inflatable bladder <NUM> is coupled to the arms <NUM>, the arms <NUM> may be moved away from each other and to a second distance <NUM>, so that tension is induced into the bladder <NUM>. In some examples, the free end of the arm <NUM> may be formed with a radius feature <NUM> so that a radius of curvature can be defined in the inflatable bladder <NUM> such that the compression element <NUM> has smooth edges that are positioned adjacent the chest wall of the patient to further provide cushioning and patient comfort.

In operation, the compression element <NUM> may use the inflatable bladder <NUM> to release air pressure during the patient's breast compression, or may induce air into the inflatable bladder <NUM> during the compression procedures. Regardless, the compression element <NUM> reduces over-compression of the breast and increased patient comfort. Additionally, the structural support <NUM> and arm <NUM> may be positioned so as to not be in the imaging area of the imaging unit so that image artifacts are not formed. Furthermore, because the inflatable bladder <NUM> is the only component in the imaging area, lower x-ray energy may be used during imaging since there is no support structure to attenuate the x-rays.

<FIG> is a flowchart of a method <NUM> for compressing a breast for an imaging procedure on an x-ray imaging system. The method <NUM> begins with moving a compression element towards a support platform (operation <NUM>). The compression element may include a structural support and an inflatable bladder that is filled with a fluid. The breast is then contacted with the compression element such that an initial compressive load is applied to the breast, and the breast is at least partially compressed between the compression element and the support platform (operation <NUM>). Upon reaching a predetermined compressive force on the breast, at least a portion of the fluid is selectively released from the inflatable bladder such that any further applied compressive load does not increase the compressive force on the breast (operation <NUM>). In some examples, the method <NUM> may further include attaching the inflatable bladder to the structural support (operation <NUM>) and then tensioning the inflatable bladder between a pair of arms (operation <NUM>). In other examples, selectively releasing fluid (operation <NUM>) may include bleeding air to the atmosphere (operation <NUM>). In still other examples, before moving the compression element (operation <NUM>), the inflatable bladder can be inflated with the fluid (operation <NUM>).

The breast compression elements <NUM>, <NUM> described herein enables the breast compression force of the x-ray imaging system to be controllable such that over-compression of the patient's breast is reduced or prevented. Therefore, patient comfort is increased, while maintaining sufficient breast compression for immobilization and imaging. The inflatable bladder can be inflated and configured to selectively release fluid, for example, through the bleed valve, to reduce over-compression forces on the patient's breast. In other examples, the inflatable bladder can be configured to selectively receive fluid during the breast compression procedures to reduce over-compression forces on the patient's breast. The structural support that the inflatable bladder is coupled to, provides sufficient rigid structure to facilitate breast compression and immobilization with the inflatable bladder.

This disclosure describes some examples of the present technology with reference to the accompanying drawings, in which only some of the possible examples were shown. Other aspects can, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein. Rather, these examples were provided so that this disclosure was thorough and complete and fully conveyed the scope of the possible examples to those skilled in the art.

Claim 1:
A breast compression unit for an x-ray imaging system (<NUM>), the breast compression unit comprising: a support platform (<NUM>) comprising a compression surface; and a compression paddle (<NUM>) movably coupled to a support arm (<NUM>), wherein the compression paddle (<NUM>) is moveable along a first axis substantially orthogonal to the compression surface and along a second axis substantially parallel to the compression surface, characterized in that
the breast compression unit further comprises a vertical drive system (<NUM>) coupled to the compression paddle (<NUM>) and configured to move the compression paddle (<NUM>) along the first axis, and an extension/retraction drive system (<NUM>) coupled to the compression paddle (<NUM>) and configured to move the compression paddle (<NUM>) along the second axis, and that
the vertical drive system (<NUM>) and the extension/retraction drive system (<NUM>) are configured such that during a breast compression procedure the compression paddle (<NUM>) may be extended with respect to the support arm (<NUM>) before moving the compression paddle (<NUM>) towards the compression surface, and that the compression paddle (<NUM>) may be retracted simultaneous with, or in discrete movements that occur individually, when the compression paddle (<NUM>) is compressing the patient's breast.