JP2017012405A - Breast imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a breast imaging device capable of performing mammogram imaging, CT imaging, tomosynthesis imaging and stereoscopic imaging.SOLUTION: A breast imaging device comprises: a radiation ray generation part for generating a radiation ray; a radiation ray detection part for detecting the radiation ray which is radiated by the radiation ray generation part; and a rotation part for rotating the radiation ray generation part and the radiation ray detection part. The rotation part shifts to a first mode in which, a state of facing of the radiation ray generation part and the radiation ray detection part is kept, when the radiation ray generation part and the radiation ray detection part are rotated, and a second mode in which, the radiation ray generation part is moved with respect to the radiation ray detection part, for shifting the radiation ray generation part and the radiation ray detection part from the facing state.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to a mammography apparatus for imaging a breast with radiation.

As an imaging method in a radiological examination apparatus for breast cancer, mammogram imaging that performs radiography by pressing the breast with a compression plate,
Tomosynthesis imaging that performs three-dimensional imaging by radiographing the breast compressed by the compression plate from multiple angles and collecting images,
CT imaging exclusively for breasts, which obtains a CT image by rotating a radiation generation unit and a radiation detection unit around the breast, are known.

  Patent Document 1 discloses a CBCT apparatus that performs CT imaging of a breast using a cone beam. According to the CBCT apparatus of Patent Document 1, an X-ray generation unit and an X-ray detection unit that are arranged to face each other across a rotation axis that passes through an opening for inserting a breast are configured to rotate around the rotation axis. Yes. In Patent Document 2, an X-ray source and an X-ray receiver can be rotated around an immobilization unit for fixing a patient's breast standing upright between two opposing compression surfaces, and mammogram imaging and breast CBCT imaging. And a configuration capable of performing mammary tomosynthesis imaging is disclosed. Patent Document 3 discloses an apparatus that allows an operator to approach from the front of the breast when the operator's breast is fixed by making the support for supporting the radiation generation section and the radiation detection section circular. Yes.

JP 2010-068929 A JP 2013-538668 A US Pat. No. 4,926,453

  Patent Document 1 discloses an imaging apparatus that specializes in breast CBCT imaging, and imaging by other imaging methods such as mammogram imaging is not possible. In Patent Document 2, the X-ray receiver rotates together with the X-ray source in tomosynthesis imaging. Therefore, it is not possible to perform imaging using other imaging methods such as tomosynthesis imaging with an X-ray receiver fixed. In Patent Document 3, the operator can access the subject's breast from a position facing the subject with the apparatus interposed therebetween, but imaging by other imaging methods such as CT imaging and tomosynthesis imaging cannot be performed.

  An object of the present invention is to provide a mammography apparatus capable of performing mammogram imaging, CT imaging, and tomosynthesis imaging.

In order to achieve the above object, a mammography apparatus according to an aspect of the present invention has the following arrangement. That is,
A radiation generator for generating radiation;
A radiation detection unit for detecting radiation emitted from the radiation generation unit;
A rotation unit that rotates the radiation generation unit and the radiation detection unit;
The rotating part is
A first form that rotates while maintaining a state in which the radiation generation unit and the radiation detection unit face each other;
A second mode is provided in which the radiation generation unit is moved from the state in which the radiation generation unit is opposed to the radiation detection unit by moving the radiation generation unit with respect to the radiation detection unit.

  According to the present invention, a mammography apparatus capable of performing mammogram imaging, CT imaging, and tomosynthesis imaging is provided.

The figure which shows the external appearance at the time of mammogram imaging | photography (CC imaging | photography) of the mammography apparatus by embodiment. The figure which shows the external appearance at the time of mammogram imaging | photography (MLO imaging | photography) of a mammography apparatus. The figure which shows the external appearance at the time of CBCT imaging | photography of a breast apparatus. The figure which shows the external appearance at the time of tomosynthesis imaging | photography of a mammography apparatus. The figure which shows the other structure for tomosynthesis imaging | photography. The figure which shows the other structure for tomosynthesis imaging | photography. The figure explaining the deformation | transformation of the irradiation field of the radiation by a collimator.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  1A and 1B are external views showing a configuration example of a mammography apparatus 100 according to the present embodiment. FIG. 1A (a) is a front view of the mammography apparatus 100, and FIG. 1A (b) is a side view of the mammography apparatus 100. FIG. A support column 111 is provided on the fixing base plate 114, and a fixed shaft 110 is connected to the support column 111 so as to be able to move up and down and tilt. An arcuate rotation motor 109 (linear motor) is attached to the fixed shaft 110, and the detection unit rotation frame 104 and the generation unit rotation frame 105 are rotatably connected to the rotation motor 109 via bearings. In addition, a wheel may be provided on the base plate 114 to be a portable type, or the fixing base plate 114 may be fixed to a floor to be a stationary type. In addition, the support 111 is provided with a display 112 that displays various states and imaging conditions of the mammography apparatus 100 and an operation unit 113 for an operator to perform various operations on the mammography apparatus.

  A radiation detection unit 102 that detects radiation emitted from the radiation generation unit 101 is fixed to the detection unit rotation frame 104 via a detection unit support unit 107. In addition, a compression plate support 108 that supports a compression plate 106 for compressing the breast during mammogram imaging or tomosynthesis imaging is detachably disposed and fixed to the detection unit rotating frame 104. The compression plate support unit 108 is fixed to the detection unit rotation frame 104 directly or indirectly. For example, in FIGS. 1A (a) and 1 (b), the compression plate support 108 is fixed to the radiation detection unit 102 or the detection unit support 107 fixed to the detection unit rotation frame 104, so that the detection unit rotation frame 104 is fixed. It is indirectly fixed against. A radiation generator 101 that generates radiation is disposed and fixed to the generator rotating frame 105 via a generator fixing shaft 115. A collimator 116 is provided on the radiation output side of the radiation generation unit 101 to adjust the shape of the radiation field to be output.

  The detection unit rotation frame 104 and the generation unit rotation frame 105 are arranged so that their rotation centers coincide, that is, concentrically, and are held by the fixed frame 103. Further, the rotation centers of the detection unit rotation frame 104 and the generation unit rotation frame 105 coincide with the center of the fixed frame 103. The radiation detection unit 102 is positioned outside the center of the fixed frame 103 (rotation center of the rotating frame) in a range that does not hinder imaging in order to secure a distance from the radiation generation unit 101.

  By adjusting the rotational positions of the detection unit rotation frame 104 and the generation unit rotation frame 105, the radiation generation unit 101 and the radiation detection unit 102 are opposed to each other with the compression plate 106 interposed therebetween, as shown in FIG. 1A. Can be placed in position. From this state, by simultaneously rotating the detection unit rotation frame 104 and the generation unit rotation frame 105 at the same speed, the radiation generation unit 101 and the radiation detection unit 102 can be rotated while maintaining an opposed state. That is, it is possible to rotate to an arbitrary angle while maintaining the positional relationship between the radiation generation unit 101 and the radiation detection unit 102 and maintain the angle. Further, the detection unit rotation frame 104 and the generation unit rotation frame 105 can be rotated independently. Therefore, for example, by rotating the generator rotating frame 105 with respect to the detector rotating frame 104, the position of the radiation generating unit 101 can be shifted from the state where they face each other (for example, the state of FIG. 1A (a)). it can.

  As described above, the detection unit rotation frame 104 and the generation unit rotation frame 105 constitute a rotation unit that rotates the radiation generation unit 101 and the radiation detection unit 102. The rotating part formed by the detecting part rotating frame 104 and the generating part rotating frame 105 is held by the fixed frame 103. Further, bearings are arranged in the gaps between the fixed frame 103, the detection unit rotation frame 104, and the generation unit rotation frame 105, respectively. The fixed frame 103 is fixed to the column 111 and does not rotate. The fixed frame 103 uses a structure that rotates by an electric drive device, a gear, a belt, or a structure that rotates using a linear motor or the like as a mechanism for rotating the detection unit rotation frame 104 and the generation unit rotation frame 105. be able to.

According to the rotating unit as described above, the operations of the first mode and the second mode shown below are provided, and various types of shooting such as mammogram imaging, CT imaging, tomosynthesis imaging, and stereo imaging can be performed by properly using these operation modes. The method can be carried out.
-1st form: It rotates, maintaining the state which the radiation generation part 101 and the radiation detection part 102 faced.
Second mode: By moving the radiation generation unit 101 with respect to the radiation detection unit 102, the radiation generation unit 101 and the radiation detection unit 102 are shifted from the above-described facing state.

More specifically, in the mammography apparatus 100 shown in FIG.
A ring-shaped first rotating frame (detecting unit rotating frame 104) to which the radiation detecting unit 102 is fixed;
The radiation generating unit 101 is fixed, and includes a ring-shaped second rotating frame (generating unit rotating frame 105) that can rotate independently of the first rotating frame.
The first form is provided by simultaneously rotating the first rotating frame and the second rotating frame, and the second form is obtained by rotating the second rotating frame with respect to the first rotating frame. Provided.

  Mammogram imaging or CT imaging (cone beam CT imaging (hereinafter referred to as breast CBCT imaging) in this embodiment) can be performed by the operation of the first form of the rotating unit. Moreover, tomosynthesis imaging or breast stereo imaging can be performed by the operation of the second form of the rotating unit. Hereinafter, the mode of operation of the rotating unit and these shooting modes will be described in more detail.

  First, the state of the mammography apparatus 100 during mammogram imaging will be described with reference to FIGS. 1A (a) and 1B. In mammogram photography, the operator first attaches the compression plate 106 and the compression plate support 108 to the mammography apparatus 100, and the radiation generation unit 101 and the radiation detection unit 102 attach the compression plate 106 as shown in FIG. 1A (a). Fix it at the opposite position. In this state, the breast is pressed by the compression plate 106, radiation is emitted from the radiation generation unit 101, and radiation is detected by the radiation detection unit 102 (radiation imaging), whereby imaging in the vertical direction (body axis direction) in mammogram imaging is performed. It can be performed. Note that vertical imaging in mammogram imaging is referred to as CC imaging (Cranio-Caudal view).

  In addition, while maintaining the positional relationship among the radiation generation unit 101, the radiation detection unit 102, and the compression plate 106, radiography is performed by rotating the rotation unit from the vertical direction to an angle of about 65 degrees, so that MLO (MLO is medio -It is a lateral oblique view. This state is shown in FIG. 1B. That is, by operating the rotating unit in the first form described above, more specifically, the first rotating frame (detecting unit rotating frame 104) and the second rotating frame (generating unit rotating frame 105) are simultaneously operated. By rotating, MLO imaging is performed.

  In mammogram imaging, the subject's breast is pressed and fixed by the radiation detection unit 102 and the compression plate 106 at each position, and radiation is generated by the radiation generation unit 101 to perform radiography. In radiography, the radiation detection unit 102 detects radiation that has passed through the breast and converts it into digital signals. The digital signal obtained by the radiation detection unit 102 is subjected to various types of image processing and provided as a diagnostic image. In all the following imaging modes, the subject's breast is inserted into the apparatus from the first side of the rotating surface of the rotating unit, and the second side opposite to the first side of the rotating surface is: An operator is open to access the subject's breast. Therefore, the operator can easily access the breast of the subject inserted in the apparatus for imaging, and the operability is improved.

  Next, breast CBCT imaging will be described with reference to FIGS. FIGS. 2A and 2B show a configuration at the time of mammary CBCT imaging in the mammography apparatus 100. FIG. 2A is a front view of the mammography apparatus 100, and FIG. 2B is a side view of the mammography apparatus 100.

  In breast CBCT imaging, the operator removes the compression plate 106 and the compression plate support 108 from the mammography apparatus 100 and attaches a breast holding tray 120 to the fixed frame 103 or the fixed shaft 110. Further, as shown in FIG. 2B, the operator attaches a protective plate 121 that separates the subject and the mammography apparatus 100 on the front of the apparatus in order to protect the subject from the rotating imaging structure. (Not shown in FIG. 2A). The protective plate 121 is detachably attached to a structure that does not move when the rotating unit rotates, for example, the fixed frame 103, and is removed in the above-described mammogram imaging, tomosynthesis imaging, and breast stereo imaging described later.

  The protective plate 121 has an opening for inserting the subject's breast at the center, and the breast inserted from the opening is held by the tray 120. Further, the protection plate 121 is disposed on the first side (the side on which the subject's breast is inserted) of the rotating surface of the rotating unit, and the operator operates the device from the second side opposite to the first side. The subject's breast inserted therein can be easily accessed. The protective plate 121 may be made of metal, lead glass, or the like so as to protect the subject from scattered radiation, and the state of the subject can be observed from the second side. A transparent structure such as acrylic, plastic, or lead glass may be used.

  The radiation generation unit 101 and the radiation detection unit 102 are fixed at positions facing each other across the tray 120 that holds the breast. Also, by holding the breast of the subject on the tray 120, the breast to be imaged is held near the center of the CBCT imaging area. The radiation detection unit 102 moves toward the center of the fixed frame 103 by the detection unit support unit 107 so as to approach the breast of the subject held near the center of the fixed frame 103. The radiation generation unit 101 and the radiation detection unit 102 rotate while the rotation unit operates in the first form while maintaining their positional relationship, and CT imaging is performed.

  The operator holds the breast of the subject inserted through the opening of the protective plate 121 on the breast-holding tray 120 and instructs the subject to maintain the posture as much as possible, and then starts imaging. The radiation generating unit 101 and the radiation detecting unit 102 are supported by a detecting unit rotating frame 104 and a generating unit rotating frame 105 at positions facing each other across the tray 120. The radiation generation unit 101 and the radiation detection unit 102 perform imaging while rotating 180 degrees or more while maintaining the positional relationship with each other. The radiation generation unit 101 generates radiation while rotating, and the radiation detection unit 102 detects the radiation that has passed through the breast, and converts the detected radiation dose into a digital signal. The obtained digital signal is subjected to CBCT reconstruction and various types of image processing, and an image for diagnosis is provided.

  Next, tomosynthesis imaging by the mammography apparatus 100 will be described. During tomosynthesis imaging, imaging is performed in the same manner as mammogram imaging, and the radiation generator 101 is moved left and right around the mammogram imaging position, and repeatedly at multiple locations while changing the inclination angle (irradiation angle) of radiation. Take a picture. At this time, the radiation detection unit 102 does not move. That is, in tomosynthesis imaging, the rotating unit operates in the above-described second form, and rotates the second rotating frame (generating unit rotating frame 105) with respect to the first rotating frame (detecting unit rotating frame 104). The mammography apparatus 100 moves the radiation generation unit 101 while fixing the radiation detection unit 102 and performs radiography at a plurality of positions of the radiation generation unit 101. Hereinafter, the operation of tomosynthesis imaging will be described with reference to FIG.

  FIG. 3 is a diagram for explaining tomosynthesis imaging by the mammography apparatus 100 of the present embodiment. In tomosynthesis imaging, the radiation generator 101 and the radiation detector 102 are shown in FIG. 3 with respect to the radiation detector 102 around the position where the radiation generator 101 and the radiation detector 102 face each other with the compression plate 106 in between (see FIG. 1A). Move left and right. For example, the mammography apparatus 100 rotates the generation unit rotation frame 105 to move the radiation generation unit 101 to the left (that is, in the direction of the arrow 131) to an angle within 50 degrees from the vertical direction, and from there to the right direction. Shoot multiple times while changing the position to the same angle. The movement of the radiation generating unit 101 may be from right to left or from left to right.

  At that time, the radiation detection unit 102 (detection unit rotating frame 104) does not move. Since the radiation detection surface of the radiation detection unit 102 is not located at the rotation center of the radiation generation unit 101, the irradiation field of the radiation generated from the radiation generation unit 101 is from the vertical direction (state in FIG. 1A). The more you leave, the more you come off. Therefore, the mammography apparatus 100 is provided with a rotation mechanism that rotates the radiation generation unit 101. When the rotation unit moves the radiation generation unit 101 with respect to the radiation detection unit 102 in the second form described above, the irradiation fields 141 and 142 of the radiation from the radiation generation unit 101 are converted into the radiation detection unit 102. The radiation generating unit 101 is rotated so as to go to. More specifically, as shown in FIG. 3, the radiation generation unit 101 is rotated so that the irradiation fields 141 and 142 of the radiation generation unit 101 are always directed to the radiation detection unit 102. As a configuration for rotating the radiation generating unit 101, for example, a motor is installed on the generating unit fixed shaft 115, or gear teeth are installed on the fixed frame 103 or the detecting unit rotating frame 104 to interlock with the moving distance. And a mechanism for rotating the radiation generating unit 101.

  As described above, in tomosynthesis imaging, imaging from the vertical direction and imaging from a plurality of tilt directions are performed. In each imaging, the radiation detection unit 102 detects the radiation output from the radiation generation unit 101 and transmitted through the breast, and converts it into a digital signal. The obtained digital signal is subjected to tomosynthesis reconstruction and various types of image processing, and a diagnostic image is provided.

  In stereo imaging of breasts, in addition to mammogram imaging, imaging at an arbitrary point is added to mammogram imaging by the same imaging method as tomosynthesis imaging. For example, a mammogram stereo image can be obtained by performing imaging by moving the radiation generating unit 101 to the left or right at an angle of 2 to 8 degrees in the same manner as in tomosynthesis imaging.

  As described above, according to the mammography apparatus 100 of the present embodiment, mammogram imaging, mammo CBCT imaging, tomosynthesis imaging, and stereo imaging can be performed.

<Modification 1>
In the above embodiment, in tomosynthesis imaging, when the irradiation direction of the radiation from the radiation generation unit 101 is shifted from the vertical direction, the irradiation field is detected by rotating the radiation generation unit 101 by the generation unit fixed shaft 115. I went to the part 102. However, the configuration in which the direction of the irradiation field is directed to the radiation detection unit 102 is not limited to this. For example, when the radiation generation unit 101 moves relative to the radiation detection unit 102, the radiation irradiation area by the radiation generation unit 101 is limited so that the radiation irradiation field from the radiation generation unit 101 faces the radiation detection unit 102. A shielding plate may be used.

  FIG. 4 is a diagram for explaining the movement direction of the radiation generating unit 101 and the formation of an irradiation field when tomosynthesis imaging is performed by the mammography apparatus 100. FIG. In FIG. 3, the radiation generation unit 101 is rotated in order to direct the irradiation field toward the radiation detection unit 102. On the other hand, in FIG. 4, by moving the shielding plate 143 in the collimator 116 and controlling the shielding area, the irradiation fields 141 and 142 of the radiation generating unit 101 are always directed toward the radiation detecting unit 102. . The operation of the shielding plate is performed in conjunction with the position of the radiation generating unit 101 using a motor or the like.

<Modification 2>
In the above embodiment, the radiation generating unit 101 is fixed to the generating unit rotating frame 105, and the radiation generating unit 101 is moved by rotating the generating unit rotating frame 105, thereby providing the operation of the second form by the rotating unit. Is not limited to this. For example, the rotation unit is configured using a detection unit rotation frame 104 to which the radiation detection unit 102 is fixed, and a guide that is fixed to the detection unit rotation frame 104 and to which the radiation generation unit 101 moves. According to the rotating unit having such a configuration, by rotating the detecting unit rotating frame 104, the radiation generating unit 101 and the radiation detecting unit 102 rotate at the same time, and the first form by the rotating unit is provided. Moreover, the said 2nd form by a rotation part is provided because the radiation generation part 101 moves along a guide.

  FIG. 5 shows a state when tomosynthesis imaging is performed in the mammography apparatus 100 having a rotating unit according to the second modification. For the movement of the radiation generating unit 101, the generating unit rotating frame 105 is not used, but the above-described moving rail 135 as a guide is used. The moving rail 135 is fixed to the detection unit rotating frame 104, and the radiation generating unit 101 is disposed on the moving rail 135 via the generating unit fixed shaft 115 and moves on the moving rail 135. For example, the radiation generating unit 101 runs on the moving rail 135 by driving a motor installed in the generating unit fixed shaft 115. The moving rail 135 has, for example, an arc shape having a center on the detection surface of the radiation detection unit 102. More preferably, the moving rail 135 has an arc shape centered on the detection surface center of the radiation detection unit 102.

  According to the configuration as described above, the radiation generating unit 101 moves on the moving rail 135 to provide the second form by the rotating unit, and the centers of the radiation irradiation fields 141 and 142 are always at the radiation detecting unit 102. Toward the center of the detection surface.

<Modification 3>
In the mammography apparatus 100, the shape of the radiation field is changed so that the radiation field irradiated from the radiation generation unit 101 matches the rectangular shape of the detection surface of the radiation detection unit 102 during tomosynthesis imaging. A collimator may be provided in the radiation generation unit 101.

  As shown in FIG. 6, the plurality of shielding plates (not shown) in the collimator 116 are moved independently so that the irradiation field of the radiation generation unit 101 is always the same as the rectangular range of the radiation detection unit 102. For example, a collimator opening 501 having a shape as shown in FIG. Thus, by controlling the shape of the irradiation field, it is possible to reduce the exposure of the subject who does not contribute to the image. Note that all the shielding plates in the collimator 116 need not be configured to be movable. For example, the shielding plate located on the chest wall side may be fixed, and the other three shielding plates may be electrically moved in both position and angle. In addition, the shape of the collimator opening can be changed to match the shape of the breast of the subject, and radiation can be applied to the part of the breast that is sandwiched between the compression plates, and radiation can not be applied to other parts. it can. Note that the shape of the breast of the subject can be obtained, for example, by photographing with an optical digital camera.

  As described above, according to the mammography apparatus 100 of the above-described embodiment, mammogram imaging and CT imaging (mammo CBCT) are performed in the first mode in which the radiation generation unit 101 and the radiation detection unit 102 are rotated in a facing state. Shooting). Further, tomosynthesis imaging or mammogram stereo imaging is performed by moving the radiation generation unit 101 in the second driving mode (the radiation detection unit 102 is kept fixed). That is, according to the mammography apparatus 100 of the above embodiment, suitable mammogram imaging corresponding to standing or sitting, mammogram stereo imaging, tomosynthesis imaging, and CBCT imaging can be performed with one apparatus. Therefore, it is possible to increase the imaging throughput and reduce the installation area of the apparatus.

  Further, according to the mammography apparatus 100 of the embodiment, in CBCT imaging, the operator can easily access the breast of the subject from the side opposite to the side where the subject's breast is inserted. That is, when the breast is fixed by CBCT imaging, the operator can approach the breast from the front of the subject, and can easily take an image and directly observe the breast of the subject inserted in the apparatus. Can do. Therefore, the problem of a general CBCT device that is considered difficult to photograph the axilla is solved. The axilla refers to the lower part of the armpit, and in order to confirm the metastasis to the lymph nodes, it is standardized that the mammogram is taken simultaneously with the breast. If breast cancer is suspected in the breast, confirming lymph node metastasis is the standard diagnosis. With a general CBCT apparatus, it is not easy to approach the subject's breast, and it is difficult to draw the axilla into the imaging range.

  Further, according to the mammography apparatus 100, when a lesion is found by mammogram imaging, mammogram stereo imaging, tomosynthesis imaging, and CBCT imaging can be performed by the same apparatus, and the inspection throughput is improved. Mammography, mammogram stereo imaging, and tomosynthesis imaging enable imaging of the axilla, so that lymph node metastasis can be confirmed quickly. Mammogram stereography, tomosynthesis imaging, or CBCT imaging for dense breasts that are difficult to diagnose with a two-dimensional image due to many breasts in the subject's breast, or when a lesion that requires understanding of the three-dimensional structure is suspected by mammogram imaging Can be performed with the same device.

  In each of the above embodiments, the fixed frame 103, the detection unit rotation frame 104, and the generation unit rotation frame 105 constituting the rotation unit are ring-shaped, but the present invention is not limited to this. For example, the detection unit rotation frame 104 and the generation unit rotation frame 105 may be semicircular frames. Further, for example, the outer shape of the fixed frame 103 does not have to be circular, and may be rectangular. Moreover, in the said embodiment, although the example to which the fixed frame 103 was mounted | worn with the horizontal direction with respect to the support | pillar 111 was shown, it cannot restrict to this, For example, it fixes to the upper part of the support | pillar 111 via the fixed shaft 110. 103 may be fixed.

101: Radiation generation unit, 102: Radiation detection unit, 103: Fixed frame, 104: Detection unit rotation frame, 105: Generation unit rotation frame, 106: Compression plate, 107: Detection unit support unit, 108: Compression plate support unit, 109: rotation motor, 110: fixed shaft, 111: support, 112: display, 113: operation unit, 114: base plate, 115: generating unit fixed shaft, 116: collimator, 120: tray

Claims (11)

A radiation generator for generating radiation;
A radiation detection unit for detecting radiation emitted from the radiation generation unit;
A rotation unit that rotates the radiation generation unit and the radiation detection unit;
The rotating part is
A first form that rotates while maintaining a state in which the radiation generation unit and the radiation detection unit face each other;
A mammography apparatus, characterized by providing a second configuration in which the radiation generation unit is moved from the state of facing the radiation detection unit by moving the radiation generation unit with respect to the radiation detection unit. .   The breast of the subject is inserted into the apparatus from the first side of the rotating surface of the rotating unit, and the operator's breast is located on the second side opposite to the first side of the rotating surface. The mammography apparatus according to claim 1, wherein the mammography apparatus is open to be accessible. The rotating part is
A ring-shaped first rotating frame to which the radiation detector is fixed;
A ring-shaped second rotating frame that is fixed and capable of rotating independently of the first rotating frame;
The first form is provided by simultaneously rotating the first rotating frame and the second rotating frame, and the second rotating frame is rotated by rotating the second rotating frame relative to the first rotating frame. The mammography apparatus according to claim 1, wherein two forms are provided. The rotating part is
A rotating frame to which the radiation detector is fixed;
A guide fixed to the rotating frame and moved by the radiation generating unit,
The first form is provided by rotating the rotating frame, and the second form is provided by moving the radiation generating unit along the guide. The mammography apparatus described in 1.   In the second embodiment, when the radiation generating unit moves relative to the radiation detecting unit, the radiation generating unit is rotated so that the radiation field from the radiation generating unit is directed to the radiation detecting unit. The mammography apparatus according to claim 3, further comprising a rotating unit that moves the mammography device.   In the second embodiment, when the radiation generation unit moves relative to the radiation detection unit, the radiation generated by the radiation generation unit is such that the radiation field from the radiation generation unit is directed toward the radiation detection unit. The mammography apparatus according to claim 4, further comprising a shielding plate that restricts an irradiation area of the mammogram.   The mammography apparatus according to claim 4, wherein the guide has an arc shape having a center on a detection surface of the radiation detection unit.   8. The mammogram imaging or CT imaging is performed according to the first mode in which the radiation generation unit and the radiation detection unit are rotated in a state of facing each other. The described mammography apparatus.   9. The protective plate according to claim 1, further comprising a protective plate that can be attached to and detached from a structure that is immovable when the rotating unit rotates. The described mammography apparatus.   The mammography apparatus according to any one of claims 1 to 9, wherein tomosynthesis imaging or mammogram stereo imaging is performed by moving the radiation generating unit in the second mode.   The collimator further changes the shape of the radiation field so that the radiation field irradiated from the radiation generation unit matches the rectangular shape of the detection surface of the radiation detection unit. The mammography apparatus according to any one of 1 to 10.

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