JP5676358B2 - Radiography equipment - Google Patents

Description

  The present invention relates to a radiographic apparatus that captures radiographic images.

  In Patent Document 1, a first arm portion on which a radiation source is installed and a second arm portion on which image data receiving means are installed are rotatably supported on a main body portion by a common rotation shaft. A mammography photographing apparatus is disclosed. In this mammography apparatus, the first and second actuators are used to switch between a state in which only the first arm portion is rotated and a state in which the first arm portion and the second arm portion are rotated together. Can be done.

Special table 2007-512065 gazette

  As in the mammography apparatus of Patent Document 1, a detector support unit that supports a radiation detector is connected to a rotating shaft, and an irradiation unit support unit and a detector support unit that support the radiation irradiation unit are rotated shafts. In a device that switches between a state of rotating integrally with the detector and a state in which the connection state between the detector support portion and the rotation shaft is released and only the irradiation portion support portion rotates integrally with the rotation shaft, It is required that the support portion and the rotation shaft can be firmly connected.

  In view of the above facts, an object of the present invention is to provide a radiation imaging apparatus that can firmly connect a detector support portion that supports a radiation detector and a rotation shaft.

  The invention of claim 1 is provided in an imaging table on which a subject's breast is placed on a mounting surface, an irradiation unit for irradiating the breast placed on the mounting surface of the imaging table, and the imaging table, A radiation detector that detects radiation irradiated from the irradiation unit and transmitted through the breast; an irradiation unit support unit that supports the irradiation unit; and a pivot shaft on which the irradiation unit support unit is fixed and rotates integrally. A base portion that is rotatably supported, a rotation drive portion that is provided on the base portion and rotates the rotation shaft, and rotates about the rotation shaft with respect to the rotation shaft A detector support unit that supports the imaging table and the radiation detector, and both ends in the axial direction are supported so that the irradiation unit faces the mounting surface at a predetermined rotation position with respect to the rotation axis. The detector support is rotatably supported, and a notch is formed in a part of the circumferential direction. The other part is a rotation shaft that is not formed with the notch, and is fixed to the rotation shaft and rotates integrally with the rotation shaft, and the detector support portion is the predetermined portion. A receiving part in which a recess in which the notch part or the non-formed part is located is formed, and the non-formed part is fitted in the recessed part, and the rotating shaft and the receiving part A first rotation position in which the detector support portion is connected to the rotation shaft and can be rotated integrally therewith, and the notch portion is located inside the recess to rotate the detector support portion and the rotation A radiation imaging apparatus comprising: a rotation driving unit configured to rotate the rotation shaft at a second rotation position where the connection state with the shaft is released.

  According to the structure of Claim 1, a test subject's breast is mounted on the mounting surface of an imaging stand. The breast placed on the mounting surface of the imaging table is irradiated with radiation from the irradiation unit. Radiation irradiated from the irradiation unit and transmitted through the breast is detected by a radiation detector.

  Here, in the configuration of claim 1, when the rotation driving unit rotates the rotation shaft to the first rotation position, the non-forming portion of the rotation shaft is fitted into the recess of the receiving portion, and the rotation shaft and the receiving portion are interposed therebetween. Thus, the detector support portion that supports the imaging table and the radiation detector is connected to the rotation shaft so as to be integrally rotatable.

  For this reason, if the rotation drive part provided in the base part rotates a rotation axis | shaft, the irradiation part support part and detector support part which support an irradiation part will rotate integrally with a rotation axis. . Thereby, the imaging | photography angle with respect to a test subject's breast can be changed.

  When the rotation drive unit rotates the rotation shaft to the second rotation position, the notch portion of the rotation shaft is located inside the recess of the receiving portion, and the connection state between the detector support portion and the rotation shaft is released.

  For this reason, if the rotation drive part provided in the base part rotates a rotation axis | shaft, only the irradiation part support part which supports an irradiation part will rotate integrally with a rotation axis | shaft. Thereby, the irradiation angle of the radiation with respect to the imaging table and the radiation detector can be changed.

  According to the first aspect of the present invention, the non-forming portion of the rotating shaft is fitted into the concave portion of the receiving portion, thereby connecting the detector support portion and the rotating shaft. Compared with a structure etc., a detector support part and a rotating shaft can be connected firmly.

  According to the first aspect of the present invention, the detector support portion and the rotation shaft are connected and disconnected by rotating the rotating shaft whose both axial ends are supported by the detector support portion. For this reason, the rotating shaft does not move in the axial direction when the detector support portion and the rotating shaft are connected and disconnected. Therefore, for example, the rotation axis is rotated in consideration of the movement of the rotation axis in the axial direction as in the configuration in which the detector support part and the rotation axis are connected and disconnected by inserting and removing the rotation axis with respect to the recess. Compared to the configuration for supporting the shaft, the rotation shaft can be firmly supported by the detector support portion, so that the detector support portion and the rotation shaft can be firmly connected.

  According to a second aspect of the present invention, the concave portion is formed in a trapezoidal shape having an upper base shorter in length than a lower bottom in the radial direction of the rotating shaft when viewed in the axial direction of the rotating shaft. 2. The radiation imaging apparatus according to claim 1, wherein the portion is in contact with two oblique sides of the trapezoidal concave portion when viewed in the axial direction of the rotation shaft.

  According to the configuration of the second aspect, the non-forming portion of the rotating shaft contacts the two oblique sides of the trapezoidal concave portion when viewed in the axial direction of the rotating shaft, so the non-forming portion contacts the concave portion at one place. Compared with the structure to perform, a non-formation part and a recessed part are couple | bonded firmly. Thereby, a detector support part and a rotating shaft can be connected firmly.

  According to a third aspect of the present invention, there is provided a rotating member that is rotatably supported around the rotating shaft and is rotated forward and reverse by the rotation driving unit, and fixed to the rotating shaft, and the rotating Abutting to rotate the rotating member and the rotating shaft integrally by rotating the rotating member forwardly rotated by the drive unit so as to rotate the rotating shaft from the first rotating position to the second rotating position. The rotating member and the rotating shaft are integrally rotated by transmitting the rotating force of the rotating member provided on the rotating shaft and reversely rotated by the rotation driving unit to the rotating shaft. Is rotated from the second rotation position to the first rotation position, and the rotation shaft is elastically deformed by the rotation force of the rotation member reversed by the rotation drive unit when the rotation shaft is not rotated by an external force. An elastic member for rotating the timber relative to the axis of rotation, a radiation imaging apparatus according to claim 1 or 2 comprising a.

  According to the configuration of the third aspect, when the rotating member is rotated forward by the rotation driving unit, the rotating member contacts the abutting member fixed to the rotating shaft, thereby rotating the rotating member and the rotating shaft integrally. Thus, the rotation shaft is rotated forward from the first rotation position to the second rotation position. Thereby, the notch part of a rotating shaft is located inside the recessed part of a receiving part, and the connection state of a detector support part and a rotating shaft is cancelled | released.

  When the rotating member is reversed by the rotation driving unit, the elastic member provided on the rotating shaft transmits the rotating force of the rotating member to the rotating shaft, so that the rotating member and the rotating shaft are rotated integrally to rotate the rotating shaft. The rotation is reversed from the second rotation position to the first rotation position. As a result, the non-forming portion of the rotating shaft is fitted into the recess of the receiving portion, and the detector support portion that supports the imaging table and the radiation detector is connected to the rotating shaft via the rotating shaft and the receiving portion. It will be in the state which can rotate integrally.

  On the other hand, when the rotating member is reversed by the rotation driving unit, the rotating member is rotated with respect to the rotating shaft while the elastic member is elastically deformed by the rotating force of the rotating member when the rotating shaft is not rotated by the external force. Thus, in a state where the rotation shaft does not rotate, the rotational force that reverses the rotation member by the rotation drive unit is absorbed by the elastic member, so that the rotation drive unit and the rotation member are damaged by forcibly rotating the rotation shaft. Can be suppressed.

  Note that the state where the rotating shaft does not rotate due to external force means that, for example, the position of the rotating shaft and the recess is displaced, and the portion where the notch portion of the rotating shaft is formed contacts the edge of the recess of the receiving portion and rotates. A case where the shaft does not rotate is conceivable.

  Since this invention set it as the said structure, the detector support part and rotation axis which support a radiation detector can be connected firmly.

It is a side view which shows the structure of a radiography apparatus. It is a front view which shows the structure of a radiography apparatus. It is a front view which shows the structure of a radiography apparatus. It is a perspective view which shows the structure for connecting a rotating shaft and an imaging stand support part. It is a side view which shows the structure for connecting a rotating shaft and an imaging stand support part. It is a front view which shows the structure for connecting a rotating shaft and an imaging stand support part. It is a perspective view which shows the structure for connecting a rotating shaft and an imaging stand support part. It is a rear view which shows the state which the part in which the notch part of the rotating shaft was formed contact | abutted to the edge of the recessed part of a receiving part. It is a side view which shows the structure of the comparative example in which a rotating shaft moves to an axial direction, when connecting and non-connecting an imaging stand support part and a rotating shaft.

Below, an example of an embodiment concerning the present invention is described based on a drawing.
(Configuration of radiation imaging equipment)
First, the configuration of the radiation imaging apparatus according to the present embodiment will be described. 1-3 is a figure which shows the structure of the radiography apparatus which concerns on this embodiment. In the figure, “x” in “○” means an arrow heading from the front of the page to the back, and “•” in “○” in the figure It means an arrow heading from the back of the page to the front. In the figure, the Y direction / −Y direction indicates the up / down direction, the Z direction / −Z direction indicates the front / rear direction of the subject L, and the X direction / −X direction indicates the left / right direction of the subject L. The subject L here refers to the subject L in a state (state shown in FIG. 1) facing the radiation imaging apparatus 10 (specifically, the chest wall contact portion 30 of the imaging table 22 described later) at the time of CC imaging. It is. Hereinafter, similarly, “subject L” will be described as meaning the subject L facing the radiation imaging apparatus 10. Moreover, the arrow-Z direction side in the radiation imaging apparatus 10 is the near side (apparatus front side) close to the subject L, and the arrow Z direction side in the radiation imaging apparatus 10 is the back side (apparatus rear side) away from the subject L. is there.

  As shown in FIG. 1, the radiation imaging apparatus 10 is an apparatus (so-called mammography) for imaging a breast N of a subject L with radiation, and CC (head-to-tail direction (Cranio & Caudal)) imaging and MLO (inside / outside oblique direction). (Medium-Lateral-Oblique) imaging.

  As the radiation, for example, X-rays, γ-rays and the like are applied. The radiation imaging apparatus 10 is an apparatus capable of imaging the breast N of the subject L in both the standing state where the subject L is standing and the sitting state where the subject L is sitting in a wheelchair or the like (see FIG. 1). . The radiation imaging apparatus 10 may be any apparatus that can image the breast N of the subject L with at least the upper body of the subject L standing.

  As shown in FIG. 1, the radiation imaging apparatus 10 includes an imaging table 22 on which the breast N of the subject L is placed in a state where the subject L is facing, and a compression member (compression plate) 34 that compresses the breast N against the imaging table 22. And an imaging table support unit 28 (an example of a detector support unit) that supports the imaging table 22 and the compression member 34. The compression member (compression plate) 34 is configured to be movable in the vertical direction by a driving force from the driving unit 34A.

  The imaging table support unit 28 includes a front plate 28A disposed on the front side (−Z direction side) of the apparatus, a back plate 28B disposed on the back side of the apparatus (Z direction side), and a lower portion of the front plate 28A. And a bottom plate 28C that connects the lower portion of the back side plate 28B.

  A planar placement surface 20 on which the breast N of the subject L is placed is formed on the upper surface of the imaging table 22. A chest wall abutting portion 30 that abuts a chest portion (chest wall) below the breast N of the subject L during CC imaging is provided on the side surface of the imaging table 22 (surface on the front side of the apparatus).

  The imaging table 22 is provided with a radiation detector 32 that detects radiation irradiated from a radiation irradiation device 24 described later and transmitted through the breast N. In the radiation imaging apparatus 10, the radiation detected by the radiation detector 32 is visualized and a radiation image is generated.

  A radiation irradiation device 24 as an example of an irradiation unit that irradiates the breast N placed on the imaging table 22 with radiation is provided above the imaging table 22. Specifically, radiation is applied to the breast N in a state of being pressed against the imaging table 22 by the compression member 34. The radiation irradiating device 24 includes a tube (not shown) as a radiation source, and is configured to irradiate radiation from the tube (not shown).

  An irradiation apparatus support section 29 as an example of an irradiation section support section that supports the radiation irradiation apparatus 24 is provided above the imaging table support section 28 between the front side plate 28A and the rear side plate 28B of the imaging stage support section 28. Is provided. The irradiation device support portion 29 is formed in an L shape in a side view (X direction view) so that the imaging table 22 (specifically, the placement surface 20) and the radiation irradiation device 24 are separated from each other by a predetermined distance. The radiation irradiating device 24 is supported.

  On the apparatus back side (Z direction side) of the irradiation apparatus support section 29, a base section 14 that rotatably supports the irradiation apparatus support section 29 is provided. The base unit 14 rotatably supports the irradiation device support unit 29 by rotatably supporting the rotation shaft 16 on which the irradiation device support unit 29 is fixed and the irradiation device support unit 29 rotates integrally. doing. Specifically, the irradiation device support portion 29 is fixed to the rotating shaft 16 by a plurality of fixing members 17 arranged in the axial direction of the rotating shaft 16 (specifically, two). In addition, the radiation irradiation apparatus 24 shown with a dashed-two dotted line in FIG.2 and FIG.3 shows the state rotated with respect to the base part 14 from the initial position shown as a continuous line.

  The base unit 14 is provided with a drive motor 36 (for example, an AC servomotor) as an example of a rotation drive unit that rotates the rotation shaft 16. The drive motor 36 can rotate the rotation shaft 16 to rotate the rotation shaft 16 forward and backward.

  The base unit 14 is provided with a lifting mechanism 38 that lifts and lowers the rotating shaft 16 in the vertical direction. The elevating mechanism 38 includes an elevating carriage 38A as a support section that supports the rotating shaft 16 so as to be rotatable, and a drive motor 38B as a drive section that raises and lowers the elevating carriage 38A. The height of the imaging table 22 and the radiation irradiation device 24 can be changed by moving the rotary shaft 16 up and down by the lifting mechanism 38.

  The drive motor 36 that rotationally drives the rotation shaft 16 is provided in the lifting carriage 38A, and moves up and down integrally with the lifting carriage 38A.

  The imaging table support unit 28 is supported so as to be rotatable with respect to the rotation shaft 16 around the rotation shaft 16, and the radiation irradiation device 24 is placed at a predetermined rotation position with respect to the rotation shaft 16. It faces the surface 20. In addition, the positional relationship between the radiation irradiation device 24 and the placement surface 20 indicated by a solid line in FIG. 3 is a positional relationship indicating a facing state in which the radiation irradiation device 24 faces the placement surface 20. When the radiation irradiation device 24 is located at a position indicated by a two-dot chain line, the imaging table support portion 28 is rotated relative to the rotation shaft 16 from a directly facing state with respect to the mounting surface 20 of the radiation irradiation device 24. Indicates the state.

  As shown in FIG. 1, the photographing table support portion 28 is provided with a rotating shaft 42 whose both ends in the axial direction are rotatably supported by the front side plate 28 </ b> A and the back side plate 28 </ b> B. As shown in FIGS. 4 and 5, the rotating shaft 42 is formed with a notch 42 </ b> A in a part of the circumferential direction, and the other part in the circumferential direction is not formed with the notched part 42 </ b> A. Part 42B. Specifically, a cut-out portion 42A and a non-formed portion 42B are formed by D-cutting at one axial end portion (Z-direction side end portion) of the rotating shaft 42.

  As shown in FIG. 1, the rotating shaft 16 is provided with a receiving portion 60 that is fixed to the rotating shaft 16 and rotates integrally with the rotating shaft 16. As shown in FIGS. 4 and 6, the receiving portion 60 is configured in a belt shape that is an arc formed in a part of the rotating shaft 16 in the circumferential direction. In the receiving unit 60, when the rotation position of the imaging table support unit 28 with respect to the rotation shaft 16 is a position where the radiation irradiation device 24 faces the mounting surface 20 (a position indicated by a solid line in FIG. 3). A recess 60A is formed in which the notch 42A and the non-formed part 42B are located.

  As shown in FIG. 6, the non-forming portion 42 </ b> B of the rotating shaft 42 has two oblique sides in the trapezoidal recessed portion 60 </ b> A in the axial direction of the rotating shaft 16 when the rotating shaft 42 is located at a connection position described later. To come into contact.

  As shown in FIG. 6, the recess 60 </ b> A is formed in a trapezoidal shape having an upper base that is shorter than the lower base in the radial direction of the rotary shaft 16 when viewed from the axial direction of the rotary shaft 16.

  As shown in FIG. 1, the imaging table support unit 28 is provided with a drive motor 44 (for example, a DC motor) as an example of a rotation drive unit that rotates the rotation shaft 42.

  As shown in FIGS. 4 to 6, a rotating gear 46 as an example of a rotating member is supported on the rotating shaft 42 so as to be rotatable around the rotating shaft 42 with respect to the rotating shaft 42. The rotating gear 46 is rotated forward and backward by a drive motor 44 via a gear train 45.

  In addition, as shown in FIG. 7, as an example of an abutting member that rotates the rotating gear 46 and the rotating shaft 42 integrally with the rotating shaft 42 as a result of contacting with the rotating gear 46 rotated forward by the drive motor 44. The pin 48 is fixed. An abutting portion 46 </ b> B formed on the inner wall of the rotating gear 46 abuts on the pin 48.

  The rotating shaft 42 is rotated integrally with the rotating shaft 46 by transmitting the rotating force of the rotating gear 46 reversely rotated by the drive motor 44 to the rotating shaft 42, and the rotating shaft 42 does not rotate by external force. In the state, a torsion coil spring 50 as an example of an elastic member that rotates the rotating gear 46 relative to the rotating shaft 42 while being elastically deformed by the rotational force of the rotating gear 46 reversed by the drive motor 44 is provided. One end portion of the torsion coil spring 50 is attached to an attachment portion 46A provided on the rotating gear 46, and the other end portion is attached to an attachment portion 67 provided on the plate member 66A.

  Specifically, the state in which the rotating shaft 42 does not rotate due to the external force specifically refers to, for example, as shown in FIG. It is conceivable that the formed portion (D-cut surface) comes into contact with the edge of the recess 60A of the receiving portion 60 and the rotating shaft 42 does not rotate.

  As shown in FIGS. 4 (B), 5 (B), and 6 (B), the drive motor 44 has a non-formed portion 42B of the rotating shaft 42 fitted in a recess 60A of the receiving portion 60, and the rotating shaft 42 And a first rotation position (hereinafter referred to as a connection position) in which the imaging table support section 28 is connected to the rotation shaft 16 via the receiving section 60 and can be rotated together, and FIGS. 6) As shown in FIG. 6A, the cut-out portion 42A of the rotating shaft 42 is positioned inside the recess 60A of the receiving portion 60, and the connection state between the imaging table support portion 28 and the rotating shaft 16 is released. The rotation shaft 42 is rotated to a second rotation position (hereinafter referred to as a non-connection position).

  Specifically, when the drive motor 44 rotates the rotation gear 46 in the forward direction, the rotation gear 46 abuts on the pin 48 and rotates to a predetermined rotation position, so that the rotation shaft 42 is moved from the connection position to the non-connection position. It comes to rotate forward. The predetermined rotation position is a rotation position for the rotation gear 46 to position the rotation shaft 42 to the non-connection position (hereinafter referred to as a gear non-connection position).

  Further, the drive motor 44 reversely rotates the rotation gear 46 so that the rotation shaft 46 is rotated from the unconnected position to the connected position via the torsion coil spring 50 by rotating to the predetermined rotation position. It has become. The predetermined rotation position is a rotation position (hereinafter referred to as a gear connection position) for the rotation gear 46 to position the rotation shaft 42 to the connection position.

  In a state in which the imaging table support unit 28 is connected to the rotation shaft 16, the rotation shaft 16 is rotationally driven by the drive motor 36, so that the imaging table support unit 28 and the irradiation device support unit 29 are rotated. (See FIG. 2).

  On the other hand, in a state where the coupling state of the imaging table support portion 28 and the rotation shaft 16 is released, the receiving portion 60 is driven to rotate by the drive motor 36, so that the receiving portion 60 is notched 42 </ b> A of the rotation shaft 42. Only the irradiation device support portion 29 is rotated integrally with the rotation shaft 16 (see FIG. 3).

  Further, as shown in FIG. 4, the rotation shaft 42 is provided with a detection unit 66 for detecting the rotation position (rotation amount) of the rotation shaft 42. Specifically, the detection unit 66 rotates integrally with the rotation shaft 42, and projects from the outer periphery of the rotation shaft 42 to the outside in the radial direction, and has a plate-like member 66A formed in an annular shape, and a transmission type having a light emitting unit and a light receiving unit. The first optical sensor 66B. The plate-like member 66A has a notch 66C formed in a part in the circumferential direction, and the other part in the circumferential direction is a non-formed part 66D in which the notch 66C is not formed.

  When the rotating shaft 42 is located at the coupling position, as shown in FIGS. 4 (B), 5 (B), and 6 (B), the notch portion 66C includes a light emitting portion and a light receiving portion of the first optical sensor 66B. When the rotary shaft 42 is located at the non-connecting position, the non-forming portion 66D is the first optical sensor as shown in FIGS. 4 (A), 5 (A), and 6 (A). 66B is located between the light emitting part and the light receiving part. That is, when the light receiving unit receives the light from the light emitting unit in the first optical sensor 66B, it is detected that the rotation shaft 42 is located at the coupling position, and the light from the light emitting unit is detected in the first optical sensor 66B. Is not received, it is detected that the rotating shaft 42 is located at the non-connected position.

  The rotation gear 46 is provided with a detection unit 68 for detecting the rotation position (rotation amount) of the rotation gear 46. Specifically, the detection unit 68 includes a plate-like member 68A that projects radially outward from the outer periphery of the rotation gear 46, a transmissive second optical sensor 68B having a light emitting unit and a light receiving unit, and a third optical sensor 68C. , And is configured. The plate-shaped member 68A is formed in a semicircular band shape in the circumferential direction 180 ° of the rotation gear 46, and the rotation gear 46 has a notch in which the plate-shaped member 68A is not formed in other portions in the circumferential direction. Part 68D.

  When the rotation gear 46 is located at the gear coupling position for positioning the rotation shaft 42 to the coupling position, as shown in FIGS. 4 (B), 5 (B), and 6 (B), a plate-like member is used. 68A is positioned between the light emitting portion and the light receiving portion of the second optical sensor 68B, and the notch 68D is positioned between the light emitting portion and the light receiving portion of the third optical sensor 68C. That is, in the second optical sensor 68B, the light receiving unit does not receive the light from the light emitting unit, and in the third optical sensor 68C, the light receiving unit receives the light from the light emitting unit, so that the rotating gear 46 is moved to the gear coupling position. It is detected that it is located.

  When the rotary gear 46 is located at the gear non-coupled position for positioning the rotary shaft 42 to the non-coupled position, as shown in FIG. 4 (A), FIG. 5 (A), and FIG. The portion 68D is positioned between the light emitting portion and the light receiving portion of the second optical sensor 68B, and the plate member 68A is positioned between the light emitting portion and the light receiving portion of the third optical sensor 68C. That is, in the second optical sensor 68B, the light receiving unit receives light from the light emitting unit, and in the third optical sensor 68C, the light receiving unit does not receive light from the light emitting unit, so that the rotation gear 46 is moved to the gear non-coupled position. It is detected that it is located.

  The drive motor 44 that rotationally drives the rotation gear 46 is controlled based on the detection results of the second optical sensor 68B and the third optical sensor 68C, not based on the detection result of the first optical sensor 66B. That is, the rotational drive of the rotation gear 46 is controlled based on the rotation position of the rotation gear 46, not the rotation position of the rotation shaft 42.

  As described above, the rotation position of the rotation shaft 42 and the rotation position of the rotation gear 46 are separately detected as described above, for example, at the portion where the notch portion 42A of the rotation shaft 42 is formed. In a state where the rotating shaft 42 does not rotate by contacting the edge of the recess 60A of the portion 60 (the state shown in FIG. 8), the rotating gear 46 is positioned at the gear coupling position for positioning the rotating shaft 42 to the coupling position. Nevertheless, there is a case where the rotating shaft 42 is not located at the connected position (the case where the rotating shaft 42 is located at the non-connected position), and this state is detected.

  As shown in FIG. 1, the base unit 14 has a fixing unit for fixing (positioning) the imaging table support unit 28 in a state where only the irradiation device support unit 29 rotates integrally with the rotation shaft 16. The disc brake 62 is provided.

  In a state where the imaging table support unit 28 and the irradiation device support unit 29 rotate integrally with the rotation shaft 16, the imaging angle with respect to the breast N is determined by the rotation amount by which the drive motor 36 rotates the rotation shaft 16. The The rotation axis 16 is driven by a drive motor 36 for a rotation amount corresponding to a predetermined imaging angle (for example, CC imaging / MLO imaging).

  Further, in the state where only the irradiation device support portion 29 rotates integrally with the rotation shaft 16, the radiation detector 32 (the mounting surface of the imaging table 22) depends on the rotation amount by which the drive motor 36 rotates the rotation shaft 16. The irradiation angle of radiation with respect to 20) is determined. The rotation shaft 16 is driven by a drive motor 36 for a rotation amount corresponding to a predetermined irradiation angle (for example, a stereo operation angle in stereo photography).

  As shown in FIG. 1, the radiation imaging apparatus 10 includes a potentiometer 63 as a detection unit for detecting the imaging angle and the radiation irradiation angle.

(Operation of the radiation imaging apparatus 10)
Next, the operation of the radiation imaging apparatus 10 will be described.

  According to the radiation imaging apparatus 10, the breast N of the subject L is placed on the mounting surface 20 of the imaging table 22 with the subject L facing the chest wall contact portion 30 of the imaging table 22. Radiation is irradiated from the radiation irradiation device 24 to the breast N placed on the mounting surface 20 of the imaging table 22. The radiation irradiated from the radiation irradiation device 24 and transmitted through the breast N is detected by the radiation detector 32. The radiation detected by the radiation detector 32 is visualized to generate a radiation image.

  Here, in the configuration of the present embodiment, when the rotation gear 46 is rotated forward by the drive motor 44, the rotation gear 46 comes into contact with the pin 48 fixed to the rotation shaft 42, so that FIG. 5 (A) and FIG. 6 (A), the rotating gear 46 and the rotating shaft 42 are rotated together to rotate the rotating shaft 42 from the connected position to the non-connected position. As a result, the cutout portion 42A of the rotating shaft 42 is positioned inside the recess 60A of the receiving portion 60, and the connection state between the imaging table support portion 28 and the rotating shaft 16 is released. At this time, the imaging table support unit 28 is fixed (positioned) to the base unit 14 by the disc brake 62.

  For this reason, when the drive motor 36 provided on the base unit 14 rotates the rotation shaft 16, only the irradiation device support portion 29 that supports the radiation irradiation device 24 rotates integrally with the rotation shaft 16. . Thereby, the irradiation angle of the radiation with respect to the radiation detector 32 (the mounting surface 20 of the imaging table 22) can be changed to a predetermined irradiation angle set in advance. Thereby, a stereo image can be acquired from the radiographic image image | photographed from the several irradiation angle. That is, so-called stereo photography and tomosynthesis photography can be performed. The irradiation angle of the radiation at this time is detected by the potentio 63, and it is detected whether the irradiation angle is a predetermined irradiation angle set in advance. The movement is retried.

  After the rotation gear 46 is rotated forward by the drive motor 44, the second optical sensor 68B and the third optical sensor 68C detect whether or not the rotation gear 46 is located at the gear disengaged position. It is detected by the first optical sensor 66B whether or not it is located at the unconnected position. When at least one of the fact that the rotation gear 46 is not located at the gear non-coupled position and the position where the rotary shaft 42 is not located at the non-coupled position is detected, for example, an error status of the device is notified to the engineer. Process.

  Further, when the rotation gear 46 is reversed by the drive motor 44, as shown in FIGS. 4B, 5B, and 6B through the torsion coil spring 50 provided on the rotation shaft 42. Then, the rotating gear 46 and the rotating shaft 42 are rotated together to reversely rotate the rotating shaft 42 from the unconnected position to the connected position. As a result, the non-forming portion 42B of the rotating shaft 42 is fitted into the recess 60A of the receiving portion 60, and the imaging table support portion 28 is connected to the rotating shaft 16 via the rotating shaft 42 and the receiving portion 60 so as to be integrated. Can be rotated.

  For this reason, when the drive motor 36 provided on the base unit 14 rotates the rotation shaft 16, the irradiation device support portion 29 that supports the radiation irradiation device 24 and the imaging table support portion 28 turn the rotation shaft 16. And rotate together. Thereby, CC imaging | photography and MLO imaging | photography can be performed by changing the imaging | photography angle with respect to the breast N of the test subject L to the predetermined irradiation angle defined beforehand, for example. The shooting angle at this time is detected by the potentio 63, and it is detected whether or not the shooting angle is a predetermined shooting angle set in advance. Will be retried.

  On the other hand, when the rotating gear 46 is reversed by the drive motor 44 to reversely rotate the rotating shaft 42 from the unconnected position to the connected position, the torsion coil spring 50 is elastically deformed when the rotating shaft 42 is not rotated by an external force ( The rotating gear 46 is rotated relative to the rotating shaft 42 (while being twisted). In this way, in a state where the rotating shaft 42 does not rotate, the rotational force that reversely rotates the rotating gear 46 by the drive motor 44 is absorbed by the torsion coil spring 50, so that the driving motor 44 is rotated by forcibly rotating the rotating shaft 42. Burnout and damage to the rotating gear 46 can be suppressed.

  In addition, after the rotation gear 46 is reversely rotated by the drive motor 44, it is detected by the second optical sensor 68B and the third optical sensor 68C whether the rotation gear 46 is located at the gear coupling position, and the rotation shaft 42 is coupled to the coupling position. It is detected by the 1st optical sensor 66B whether it is located in. When it is detected that the rotation gear 46 is not located at the gear coupling position, for example, processing such as notifying an engineer as an error state of the apparatus is performed.

  When it is detected that the rotation gear 46 is located at the gear coupling position and that the rotation shaft 42 is not located at the non-coupling position, the drive motor 36 rotates the rotation shaft 16 to one and the other ( Swinging left and right of the irradiation device support portion 29). Thereby, when the contact is released from the state in which the portion where the cutout portion 42A of the rotating shaft 42 is formed contacts the edge of the recess 60A of the receiving portion 60, the elastically deformed torsion coil spring 50 is restored, The rotating shaft 42 can be rotated and the rotating shaft 42 can be positioned at a connection position where it should be.

  In the configuration of the present embodiment, the non-forming portion 42B of the rotating shaft 42 is fitted into the recess 60A of the receiving portion 60, thereby connecting the imaging table support portion 28 and the rotating shaft 16, so that the members are pressed against each other. Therefore, the imaging table support 28 and the rotation shaft 16 can be firmly connected as compared with a configuration in which the imaging table support 28 is connected by a frictional force.

  Further, in the configuration of the present embodiment, the imaging table support unit 28 and the rotating shaft 16 are connected and disconnected by rotating the rotation shaft 42 whose both ends in the axial direction are supported by the imaging table support unit 28. The For this reason, the rotating shaft 42 does not move in the axial direction when the imaging table support portion 28 and the rotating shaft 16 are connected and disconnected. Therefore, for example, the rotation shaft 42 is axially connected as in the configuration in which the imaging table support portion 28 and the rotation shaft 16 are connected and disconnected by inserting and removing the rotation shaft 42 with respect to the recess 60A of the receiving portion 60. Compared to the configuration in which the rotating shaft 42 is supported in consideration of the movement of the rotating shaft 42, the rotating shaft 42 can be firmly supported by the imaging table support portion 28, so that the imaging table support portion 28 and the rotation shaft 16 are firmly connected. it can.

  Further, as shown in FIG. 9, in the configuration of the comparative example in which the rotating shaft 42 moves in the axial direction when connecting and disconnecting the imaging table support portion 28 and the rotating shaft 16, the shaft of the rotating shaft 42 is used. A moving space S for moving the rotating shaft 42 in the direction is required, and when the subject L is a wheelchair patient, the moving space S is cramped when it is located at the foot of the subject L and becomes uncomfortable at the time of photographing. On the other hand, in the configuration of the present embodiment, the rotating shaft 42 does not move in the axial direction when connecting and disconnecting the imaging table support unit 28 and the rotating shaft 16, so the axial direction of the rotating shaft 42 Therefore, the moving space S for moving the rotating shaft 42 becomes unnecessary.

  Further, according to the configuration of the present embodiment, the non-forming part 42B of the rotating shaft 42 contacts the two oblique sides of the trapezoidal recess 60A when viewed in the axial direction of the rotating shaft 16, so the non-forming part 42B The non-formed part 42B and the recessed part 60A are firmly coupled as compared with the configuration in which the recessed part 60A is brought into contact at one place. Thereby, the imaging stand support part 28 and the rotating shaft 16 can be firmly connected.

Note that the shape of the recess 60 </ b> A of the receiving portion 60 does not have to be trapezoidal, and may be any shape as long as the rotating shaft 42 can be fitted.
Further, the radiographic apparatus 10 does not have the torsion coil spring 50 and the pin 48, the rotation gear 46 is fixed to the rotation shaft 42, and the forward rotation force and the reverse rotation force of the drive motor 44 rotate via the rotation gear 46. The configuration may be such that it is transmitted directly to the shaft 42.

The present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements can be made. For example, the modification examples described above may be appropriately combined.

14 Base part 16 Rotating shaft 20 Mounting surface 22 Imaging stand 24 Radiation irradiation device (an example of irradiation part)
28 Imaging stand support (an example of a detector support)
29 Irradiation device support (an example of irradiation unit support)
32 Radiation detector 36 Drive motor (an example of a rotation drive unit)
42 Rotating shaft 42A Notch portion 42B Non-forming portion 44 Drive motor (an example of a rotation drive portion)
46 Rotating gear (an example of a rotating member)
48 pins (example of contact member)
50 Coil spring (an example of an elastic member)
60A Concave portion 60 Receiving portion L Subject N Breast

Claims (3)

An imaging table on which the subject's breast can be placed on the mounting surface;
An irradiation unit for irradiating the breast placed on the mounting surface of the imaging table with radiation;
A radiation detector that is provided on the imaging table and detects radiation irradiated from the irradiation unit and transmitted through the breast;
An irradiating unit supporting unit for supporting the irradiating unit;
A base portion that rotatably supports a rotation shaft that rotates integrally with the irradiation portion support portion fixed;
A rotation drive unit provided on the base unit and configured to rotate the rotation shaft;
Around the axis of the rotation axis is supported so as to be rotatable with respect to the rotation axis, and the irradiation unit faces the mounting surface at a predetermined rotation position with respect to the rotation axis, A detector support for supporting the radiation detector;
Both ends in the axial direction are rotatably supported by the detector support part, a notch part is formed in a part in the circumferential direction, and the other part in the circumferential direction is a non-formed part in which the notch part is not formed A rotation axis;
A recess that is fixed to the rotation shaft and rotates integrally with the rotation shaft, and the notch portion or the non-forming portion is located inside when the detector support portion is located at the predetermined rotation position. A receiving part formed with,
A first rotation position in which the non-forming portion is fitted in the recess, the detector support portion is connected to the rotation shaft via the rotation shaft and the receiving portion, and can rotate integrally; and the notch A rotation drive unit that rotates the rotation shaft to a second rotation position where the portion is located inside the recess and the connection state between the detector support and the rotation shaft is released;
A radiography apparatus comprising: The concave portion is formed in a trapezoidal shape having an upper base shorter in length than a lower bottom on the radially inner side of the rotating shaft in the axial direction view of the rotating shaft,
The radiographic apparatus according to claim 1, wherein the non-forming portion is in contact with two oblique sides of the trapezoidal recess when viewed in the axial direction of the rotation shaft. A rotating member that is rotatably supported about the rotating shaft around the rotating shaft, and is rotated forward and backward by the rotation driving unit;
The rotating member fixed to the rotating shaft and rotated in the forward direction by the rotation driving unit abuts to rotate the rotating member and the rotating shaft integrally to move the rotating shaft from the first rotation position to the first rotation position. A contact member for normal rotation to two rotation positions;
The rotation member is provided on the rotation shaft, and the rotation force of the rotation member reversely rotated by the rotation drive unit is transmitted to the rotation shaft, so that the rotation member and the rotation shaft are rotated together to rotate the rotation shaft. In a state where the rotation shaft is reversed from the second rotation position to the first rotation position and the rotation shaft is not rotated by an external force, the rotation member is rotated while being elastically deformed by the rotation force of the rotation member reversed by the rotation driving unit. An elastic member that rotates relative to the shaft;
A radiation imaging apparatus according to claim 1 or 2.

Images