JP7338566B2 - diagnostic imaging equipment - Google Patents

Description

The present invention relates to a diagnostic imaging apparatus.

2. Description of the Related Art Conventionally, there has been known an imaging diagnostic apparatus that captures an image of the inside of a human body (see, for example, Patent Document 1).

The diagnostic imaging apparatus (PET apparatus: positron emission tomography apparatus) described in Patent Document 1 uses a drug labeled with a positron emission nuclide to detect a pair of gamma rays (radiation) generated by pair annihilation of an electron and a positron. By doing so, an image of the inside of the human body is captured. The captured image is used for image diagnosis such as the presence or absence of cancer cells. This PET apparatus comprises an imaging unit having an aperture and including a detector for detecting gamma rays, a bed on which a human body to be imaged is placed in a supine position, and a rotation mechanism for rotating the imaging unit. Prepare. By rotating the imaging unit, the PET apparatus described in Patent Document 1 has a head imaging state in which the head of the human body in the supine position is imaged, and a mammography state in which the breasts of the human body in the prone position are imaged. and can be switched between.

JP 2018-31656 A

Here, in the PET apparatus (image diagnostic apparatus) disclosed in Patent Document 1, when photographing the head, the photographing is performed with the opening of the photographing unit (imaging unit) facing the direction of the subject's head and feet. The part surrounds the head. In addition, although it is not specified in Patent Document 1, when imaging with an image diagnostic apparatus (PET apparatus), the subject's body is fixed so that the subject does not move during imaging. . Therefore, when photographing the subject's head, the imaging unit surrounds the subject's head and the subject's body is fixed. stops, there is the inconvenience that the subject cannot be evacuated from the diagnostic imaging apparatus. Therefore, there is a demand for a diagnostic imaging apparatus that can evacuate a subject even when power supply to the imaging diagnostic apparatus is stopped while imaging is being performed with the opening of the imaging unit facing the direction of the subject's head and feet. .

The present invention has been made to solve the above-described problems, and one object of the present invention is to provide an image that is captured while the opening of the imaging unit faces the direction of the subject's head and feet. To provide an image diagnostic apparatus capable of withdrawing a subject even when power supply to the diagnostic apparatus is stopped.

In order to achieve the above object, an image diagnostic apparatus according to one aspect of the present invention includes a bed on which a subject is placed and an opening, and a diagnosis target region of the subject placed on the bed is arranged in the opening. an imaging unit that captures an image of a diagnostic target region of a subject by detecting radiation emitted from the diagnostic target region in a state in which the subject is in a first direction that is the head-to-foot direction, and a direction that is different from the first direction By moving at least one of the imaging unit and the bed in the second direction, the imaging unit and the bed are moved relative to each other, so that the imaging unit detects the subject's first A first imaging position, which is an imaging position for imaging the diagnosis target part of the image, and an imaging position for imaging a second diagnosis target part of the subject, which is a part different from the first diagnosis target part, by the imaging unit a movement mechanism configured to relatively move the imaging unit and the bed between a certain second imaging position; and a movement control mechanism that restricts relative movement of the imaging unit and the bed in the second direction and enables relative movement of the imaging unit and the bed in the first direction when the power supply is stopped.

In the diagnostic imaging apparatus according to the above aspect, the imaging unit and the bed can be moved relative to each other in the first direction and the second direction when energized. Therefore, switching between the first imaging position and the second imaging position is possible. can be imaged. Further, when the energization is stopped, the relative movement of the imaging unit and the bed in the second direction different from the first direction is regulated, and the relative movement of the imaging unit and the bed in the first direction, which is the head-foot direction, is restricted. Since it is configured to be movable, the subject can be retracted from the opening of the imaging section by manually moving the imaging section and the bed relative to each other in the first direction by the operator. As a result, it is possible to evacuate the subject even when the image diagnostic apparatus is powered off while the opening of the imaging unit faces the direction of the subject's head and feet. In addition, when the energization is stopped, the relative movement of the imaging unit and the bed in the second direction different from the head-foot direction (first direction) is restricted. can be limited to the first direction.

1 is a diagram for explaining the configuration of a diagnostic imaging apparatus according to one embodiment; FIG. 1 is a block diagram for explaining the configuration of a diagnostic imaging apparatus according to one embodiment; FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining imaging of a subject according to an embodiment, wherein (A) is a diagram for explaining imaging of the subject's head, and (B) is a diagram for explaining imaging of the subject's breast; It is a diagram for It is a figure for demonstrating the movement of the imaging part by the movement mechanism by one Embodiment. It is a figure for demonstrating the operation|movement at the time of electricity supply of a 1st direction movement mechanism, a 1st direction movement control part, and a 1st direction movement control release part by one Embodiment. FIG. 10 is a diagram for explaining the operation of the first direction movement mechanism, the first direction movement restricting section, and the first direction movement restriction canceling section according to the embodiment at the time of energization stop; FIG. 10 is a diagram for explaining the operation of the second direction movement mechanism and the second direction movement control mechanism according to the embodiment when energized; FIG. 5 is a diagram for explaining the second direction movement mechanism and the operation of stopping when energized of the second direction movement control mechanism according to one embodiment;

An embodiment embodying the present invention will be described below with reference to the drawings.

(Overall configuration of diagnostic imaging apparatus)
An image diagnostic apparatus 100 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8. FIG.

As shown in FIG. 1, the diagnostic imaging apparatus 100 is an apparatus for diagnosing a disease (for example, cancer) at a diagnosis target site of a subject 101 (see FIG. 2).

The diagnostic imaging apparatus 100 is a PET apparatus that captures an image of a diagnostic target site of the subject 101 by detecting radiation (gamma rays) generated at the diagnostic target site of the subject 101 due to a radioactive drug that has been administered to the subject 101 in advance. be. Radiation (gamma ray) is generated in the subject's 101 body by pair annihilation of a positron generated from a radioactive drug and an electron possessed by an atom located near the positron. The diagnostic imaging apparatus 100 generates a captured image based on radiation (gamma rays) detected at a diagnostic target site of the subject 101 . Then, based on the generated captured image, the doctor diagnoses the disease of the diagnosis target site of the subject 101 . The diagnosis target region of subject 101 includes a first diagnosis target region and a second diagnosis target region. A first diagnostic target region of the subject 101 is the head 101a of the subject 101 (see FIG. 3A). A second diagnosis target region of the subject 101 is the breast 101b of the subject 101 (see FIG. 3A).

As shown in FIG. 2, the diagnostic imaging apparatus 100 according to this embodiment includes a bed 1, an imaging unit 2, a moving mechanism 3, a movement control mechanism 4, a position detecting unit 5, an operation panel 6, and a headrest 7. and a control unit 8 .

The bed 1 is configured so that a subject 101 (see FIG. 3A) can be placed thereon. The bed 1 includes a top board 11 and a base 12 . The tabletop 11 is configured so that the subject 101 can be placed in the supine position or the prone position in order to image the diagnosis target region. In addition, the top plate 11 is provided with a hole 11a (see FIG. 1) into which the breast 101b is inserted in order to image the breast 101b (see FIG. 3A). The top plate 11 has a longitudinal direction in the X direction, which is the head-foot direction, in the horizontal plane, and a lateral direction in the Y direction, which is a direction orthogonal to the X direction in the horizontal plane. In addition, the subject 101 is placed on the tabletop 11 in a supine position when the head 101a is to be imaged. When the breast 101b is to be imaged, the subject 101 is placed in a prone position. The subject 101 is placed on the tabletop 11 so that the head 101a is located on the X1 direction side and the feet are located on the X2 direction side in both the supine position and the prone position. The base 12 supports the top plate 11 from below (Z2 direction).

In this embodiment, the imaging section 2 includes a housing section 21 and a plurality of radiation detectors 22 . A detailed configuration of the imaging unit 2 will be described later.

The radiation detector 22 is, for example, a scintillator detector including a scintillator and a silicon photomultiplier (SiPM). The radiation detector 22 detects radiation (gamma rays). The radiation detector 22 then outputs a detection signal corresponding to the detected radiation (gamma ray). A plurality of radiation detectors 22 are arranged in an annular shape within the casing 21 of the imaging unit 2 so as to surround the opening 21a (see FIG. 3A). That is, the plurality of radiation detectors 22 are arranged so as to surround the diagnosis target region (the head 101a or the breast 101b) of the subject 101 and are configured to detect radiation (gamma rays). The radiation detector 22 may be configured to include a photomultiplier tube other than the silicon photomultiplier. The details of the configuration in which the imaging unit 2 images the diagnosis target region (the head 101a or the breast 101b) of the subject 101 will be described later.

The moving mechanism 3 relatively moves the imaging unit 2 and the bed 1 . The moving mechanism 3 includes a first imaging position 10a (see FIG. 3A), which is an imaging position for imaging a first diagnosis target part of the subject 101 (the head 101a of the subject 101), The imaging position of the imaging unit 2 is switched to a second imaging position 10b (see FIG. 3B), which is an imaging position for imaging the second diagnosis target site (breast 101b of the subject 101). there is Details of a configuration in which the moving mechanism 3 switches the imaging position of the imaging unit 2 between the first imaging position 10a and the second imaging position 10b will be described later.

In this embodiment, as shown in FIG. 2, the movement mechanism 3 includes a first direction movement mechanism 31, a second direction movement mechanism 32, and a rotation mechanism 33. As shown in FIG. The first direction moving mechanism 31 moves the imaging section 2 in the head and foot direction (X direction). Specifically, the imaging unit 2 is moved in the head-to-foot direction (X direction) on paths 30c and 30d in FIG. The first directional movement mechanism 31 includes, for example, a ball screw mechanism. The second direction moving mechanism 32 moves the imaging section 2 in the second direction. Specifically, the second direction moving mechanism 32 moves the imaging section 2 in the second direction along the paths 30a and 30b in FIG. The second directional movement mechanism 32 includes, for example, a ball screw mechanism. The rotation mechanism 33 is configured to rotate the imaging section 2 at a switching position 10c for switching the posture of the imaging section 2 . Then, the rotation mechanism 33 rotates the imaging unit 2 to switch between the head imaging posture and the breast imaging posture. Note that in the present embodiment, the second direction is the vertical direction (Z direction). Rotation mechanism 33 includes, for example, a motor.

Further, the movement control mechanism 4 enables relative movement of the imaging unit 2 and the bed 1 in the first direction and the second direction when energized, and allows the imaging unit 2 and the bed 1 to move in the second direction when energization is stopped. It is configured to restrict the relative movement of the bed 1 and to allow the relative movement of the imaging unit 2 and the bed 1 in the first direction. Specifically, the movement control mechanism 4 includes a first direction movement control unit 41 that controls relative movement of the imaging unit 2 and the bed 1 in the first direction, and a relative movement of the imaging unit 2 and the bed 1 in the second direction. and a second direction movement control unit 42 that regulates movement.

The first direction movement control section 41 is configured to enable relative movement of the imaging section 2 and the bed 1 in the first direction when the power supply is stopped. The second direction movement control section 42 is configured to restrict the relative movement of the imaging section 2 and the bed 1 in the second direction by the movement mechanism 3 when the power supply is stopped. The details of the configuration of the first direction movement control section 41 and the details of the configuration of the second direction movement control section 42 will be described later.

The position detection section 5 is configured to detect the position of the imaging section 2 . Position detector 5 includes, for example, an optical sensor. The arrangement of the position detector 5 will be described later.

The operation panel 6 accepts an operation for relatively moving the bed 1 and the imaging section 2 . In this embodiment, the operation panel 6 receives an operation to move the imaging section 2 in order to move (change) the relative position between the bed 1 and the imaging section 2 . The operation panel 6 includes a head movement switch 61 , a breast movement switch 62 and a fine adjustment switch 63 . The head movement switch 61, the breast movement switch 62, and the fine adjustment switch 63 are, for example, sheet switches that accept operations when pressed.

The head movement switch 61 accepts an operation to move the imaging section 2 to the first imaging position 10a (see FIG. 3A) in order to image the head 101a. Also, the breast movement switch 62 receives an operation to move the imaging unit 2 to the second imaging position 10b (see FIG. 3B) in order to image the breast 101b. Specifically, the imaging unit 2 starts moving toward the first imaging position 10a by receiving an operation on the head movement switch 61 at any position on the path 30 (see FIG. 4). Similarly, the imaging unit 2 starts moving toward the second imaging position 10b by receiving an operation on the breast movement switch 62 at any position on the path 30 . The movement mechanism 3 moves the imaging section 2 toward the first imaging position 10a under the control of the control section 8 while the head movement switch 61 is being operated (depressed). Similarly, the movement mechanism 3 moves the imaging section 2 toward the second imaging position 10b under the control of the control section 8 while the breast movement switch 62 is being operated (depressed).

The fine adjustment switch 63 is configured to receive an operation for finely adjusting the imaged position of the head 101a of the subject 101 by moving the imaging unit 2 in the first direction (head-foot direction). That is, based on the operation of the fine adjustment switch 63, the control unit 8 changes the position of the imaging unit 2 between the first imaging position 10a (see FIG. 3A) and the first movement direction switching position 10d (see FIG. 4). (path 30d in FIG. 4), it is moved for fine adjustment.

The headrest 7 supports the subject's 101 head 101a (see FIG. 3). The headrest 7 is configured to be removable. The headrest 7 is installed at a predetermined position on the bed 1 .

The control unit 8 is a computer including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and a GPU (Graphics Processing Unit). Also, the control unit 8 controls each unit of the diagnostic imaging apparatus 100 . The control unit 8 controls the operation of the moving mechanism 3 based on operations on the head movement switch 61 , the breast movement switch 62 and the fine adjustment switch 63 of the operation panel 6 . Also, the control unit 8 generates a captured image based on the detection signal output by the imaging unit 2 .

(Relative movement of imaging unit and bed)
As shown in FIG. 3, in the present embodiment, the movement mechanism 3 has a first direction (X direction), which is the direction of the head and feet of the subject 101, and a second direction (Z direction), which is a direction different from the first direction. ), at least one of the imaging unit 2 and the bed 1 is moved. In addition, the moving mechanism 3 relatively moves the imaging unit 2 and the bed 1 so that the imaging unit 2 can take an image of the first diagnosis target region of the subject 101 with the opening 21a directed in the first direction. a first imaging position 10a, which is a position, and a second imaging position 10b, which is an imaging position for imaging a second diagnosis target region of the subject 101, which is a region different from the first diagnosis target region, by the imaging unit 2. The imaging unit 2 and the bed 1 are configured to move relative to each other between . In this embodiment, the moving mechanism 3 is configured to relatively move the bed 1 and the imaging unit 2 by moving the imaging unit 2 .

(Structure of imaging unit)
As shown in FIG. 3A, the imaging unit 2 detects the radiation emitted from the diagnosis target region of the subject 101 placed on the bed 1 in a state in which the diagnosis target region is arranged in the opening 21a. is configured to image the diagnosis target region of the subject 101 . The housing part 21 has an annular shape. The annular housing portion 21 has an opening 21a. The opening 21a penetrates through the center of the ring in the axial direction of the ring. When imaging is performed by the imaging unit 2 , a diagnosis target region (the head 101 a or the breast 101 b ) of the subject 101 is arranged within the opening 21 a of the housing unit 21 .

(imaging position)
As shown in FIG. 3 , the imaging unit 2 detects radiation (gamma rays) emitted from a diagnosis target region (head 101a or breast 101b) of a subject 101 placed on the bed 1, thereby detecting radiation of the subject 101. An image of a diagnosis target region (head 101a or breast 101b) is taken. In this embodiment, the imaging unit 2 images the head 101a of the subject 101 as shown in FIG. 3A. The imaging unit 2 also images the breast 101b of the subject 101, as shown in FIG. 3B. That is, the imaging unit 2 is configured to be movable by the moving mechanism 3, and is used for imaging the head 101a and for imaging the breast 101b. The imaging unit 2 is configured to be able to change between a head imaging posture for imaging the head 101a and a breast imaging posture for imaging the breast 101b. In the head imaging posture, the imaging unit 2 is arranged so that the direction in which the opening 21a extends (the axial direction of the opening 21a) coincides with the head and foot direction (the X direction in FIG. 3, the longitudinal direction of the top board 11). In the mammography posture, the imaging unit 2 is arranged so that the direction in which the opening 21a extends (the axial direction of the opening 21a) coincides with the vertical direction (the Z direction in FIG. 3).

As shown in FIG. 3A, the headrest 7 supports the head 101a of the subject 101 when imaging the head 101a. The headrest 7 is configured to be removable. The headrest 7 is installed at a predetermined position on the bed 1 . Further, as shown in FIG. 3B, the image diagnostic apparatus 100 is configured to perform imaging with the headrest 7 removed when imaging the breast 101b.

In this embodiment, as shown in FIG. 4, the moving mechanism 3 moves the imaging section 2 along the path 30 between the first imaging position 10a and the second imaging position 10b. The path 30 also includes a switching position 10c. The switching position 10c is a position at which the posture of the imaging unit 2 is switched. In the present embodiment, the rotation mechanism 33 is configured to rotate the imaging section 2 at the switching position 10c for switching the orientation of the imaging section 2 . By rotating the imaging unit 2 by the rotation mechanism 33, the posture of the imaging unit 2 is switched between the posture for imaging the first imaging position 10a and the posture for imaging the second imaging position 10b.

When imaging the head 101a of the subject 101, the imaging unit 2 is switched to the position in which the opening 21a faces the first direction (X direction) at the switching position 10c, and then moves to the first moving direction switching position 10d. It is moved in the second direction and then moved in the first direction to the first imaging position 10a.

Further, when imaging the breast 101b of the subject 101, the imaging unit 2 is switched to the posture in which the opening 21a faces the second direction (Z direction) at the switching position 10c, and then moves to the second movement direction switching position 10e. up to the second imaging position 10b in the first direction, and then in the second direction up to the second imaging position 10b.

The position detector 5 is provided near the switching position 10c. In this embodiment, the control unit 8 is configured to move the imaging unit 2 to the position where the position detection unit 5 is provided by controlling the moving mechanism 3 when the power supply is resumed. In other words, the control unit 8 is configured to control the moving mechanism 3 to move the imaging unit 2 to the switching position 10c when the energization resumes. That is, the switching position 10c is the initial position of the imaging section 2. FIG.

(Configuration of first direction movement mechanism and first direction movement control section)
As shown in FIG. 5, the first direction moving mechanism 31 includes a driving portion 31a, a first driving force transmission member 31b, a second driving force transmission member 31c, and a holding member 31d. The drive unit 31a transmits a driving force for moving the imaging unit 2 to the first driving force transmission member 31b. The first driving force transmission member 31b is connected to the driving portion 31a and transmits the driving force from the driving portion 31a. The second driving force transmission member 31c transmits the driving force from the driving section 31a to the imaging section 2 via the first driving force transmission member 31b. That is, the first directional movement mechanism 31 transmits the driving force from the driving unit 31a to the imaging unit 2 via the first driving force transmission member 31b and the second driving force transmission member 31c, thereby moving the imaging unit 2. Move in the first direction. The holding member 31d is configured to idly hold the second driving force transmission member 31c with respect to the first driving force transmission member 31b. The first driving force transmission member 31b includes, for example, a ball screw. Also, the second driving force transmission member 31c includes, for example, a ball screw nut. Moreover, the holding member 31d includes a ball bearing. That is, the first direction moving mechanism 31 is a so-called ball screw mechanism.

The first directional movement control portion 41 includes a first directional movement restricting portion 41a and a first directional movement restriction canceling portion 41b. The first direction movement restricting portion 41 a is provided in the driving portion 31 a of the first direction movement mechanism 31 . The first direction movement restricting portion 41a includes, for example, an electromagnetic brake. The first direction movement restricting part 41a is configured not to restrict the relative movement of the imaging part 2 and the bed 1 in the first direction by the moving mechanism 3 when energized. Specifically, the first direction movement restricting portion 41a is maintained in a state capable of driving the driving portion 31a when energized.

Further, the first direction movement restriction release unit 41b is configured to release the restriction on the relative movement of the imaging unit 2 and the bed 1 in the first direction. The first direction movement restriction release portion 41b includes a first contact member 140, a second contact member 141, a biasing member 142, a coil 143, a first housing 144 that holds the holding member 31d, and a second housing 144 that holds the holding member 31d. It includes a second housing 145 holding the contact member 141 and the coil 143 and a base 146 holding the first housing 144 and the second housing 145 . The first contact member 140 is connected to the second driving force transmission member 31c via a biasing member 142. As shown in FIG. The biasing member 142 biases the first contact member 140 toward the second driving force transmission member 31c (X1 direction side). Biasing member 142 includes, for example, a leaf spring. When the first contact member 140 and the second contact member 141 are not in contact with each other, the first contact member 140 and the biasing member 142 rotate together with the second driving force transmission member 31c.

Further, the holding member 31d holds the second driving force transmission member 31c so as to be rotatable. Therefore, when the first contact member 140 and the second contact member 141 are not in contact with each other, the second driving force transmission member 31c idles with respect to the first driving force transmission member 31b.

The second contact member 141 is held by the second housing 145 via the coil 143 . The second contact member 141 is provided on the first contact member 140 side (X1 direction side) of the second housing 145 .

First housing 144 and second housing 145 are connected to base 146 . The first housing 144 and the second housing 145 do not rotate together with the first driving force transmission member 31b. The imaging unit 2 is provided on the base 146, and moves in the first direction (X direction) as the driving unit 31a is driven.

The first direction movement restriction release unit 41b enables relative movement of the imaging unit 2 and the bed 1 in the first direction by the moving mechanism 3 when energized. Specifically, as shown in FIG. 5, the first directional movement restriction release portion 41b is configured to prevent the second driving force transmission member 31c from idling with respect to the first driving force transmission member 31b when energized. is configured to More specifically, when the image diagnostic apparatus 100 is energized, power is applied to the coil 143 . When electric power is applied, the coil 143 functions as an electromagnet to pull the first contact member 140 toward the second contact member 141 and connect the first contact member 140 and the second contact member 141. . As a result, the first direction movement restriction releasing portion 41b prevents the second driving force transmission member 31c from idling with respect to the first driving force transmission member 31b when energized. Therefore, since the driving force of the driving portion 31a is transmitted to the second driving force transmitting member 31c through the first driving force transmitting member 31b, the imaging portion 2 and the bed 1 are relatively moved by the moving mechanism 3.

Further, as shown in FIG. 6, the first direction movement restricting section 41a is configured to restrict the relative movement of the imaging section 2 and the bed 1 in the first direction by the moving mechanism 3 when the energization is stopped. ing. In this embodiment, the first direction movement restricting portion 41a is configured to restrict the operation of the first driving force transmission member 31b when the energization is stopped. Specifically, when the energization is stopped, the first direction movement restricting portion 41a restricts the driving (rotation) of the drive shaft of the driving portion 31a, thereby suppressing the operation of the first driving force transmission member 31b. be done.

Further, the first direction movement restriction canceling part 41b is in a state in which the relative movement of the imaging part 2 and the bed 1 in the first direction by the moving mechanism 3 is restricted by the first direction movement restriction part 41a when the energization is stopped. As it is, the imaging unit 2 and the bed 1 can be moved relative to each other in the first direction without using the moving mechanism 3 . In the present embodiment, the first direction movement restriction canceling part 41b cancels the movement of the imaging part 2 by the first direction movement mechanism 31 in a state where the movement of the imaging part 2 by the first direction movement mechanism 31 is restricted by the first direction movement restriction part 41a when the energization is stopped. It is configured to allow the imaging section 2 to move in the first direction without using the unidirectional movement mechanism 31 . Specifically, as shown in FIG. 6, when the energization is stopped, the energization of the coil 143 is also stopped, so the first contact member 140 is moved away from the second contact member 141 by the biasing member 142 . It is moved in the direction (X1 direction side). Thereby, the first direction movement restriction release portion 41b is configured to allow the second driving force transmission member 31c to idle with respect to the first driving force transmission member 31b. Since the second driving force transmission member 31c idles with respect to the first driving force transmission member 31b, the operator can manually move the imaging unit 2. As shown in FIG.

(Configuration of second direction movement mechanism and second direction movement control section)
As shown in FIG. 7, the second direction moving mechanism 32 includes a driving portion 32a, a pinion 32b, a driving shaft 32c connecting the driving portion 32a and the pinion 32b, and a rack 32d formed with a groove that meshes with the pinion 32b. and a base 32e provided on the rack 32d. The second direction moving mechanism 32 is configured to move the rack 32d in the second direction and move the imaging unit 2 in the second direction by operating (rotating) the pinion 32b by the drive unit 32a. . The second direction movement mechanism 32 is a so-called rack and pinion mechanism.

In this embodiment, the second directional movement control section 42 (see FIG. 2) is provided in the driving section 32a of the second directional movement mechanism 32. As shown in FIG. The second directional movement control section 42 is configured to enable relative movement of the imaging section 2 and the bed 1 by the second directional movement mechanism 32 when energized. Specifically, as shown in FIG. 7, the second direction moving mechanism 32 makes the drive shaft 32c rotatable when energized. As a result, the rack 32d is moved in the second direction with the rotation of the pinion 32b, so that the imaging unit 2 and the bed 1 can be moved relative to each other by the second direction moving mechanism 32. FIG. In the present embodiment, the second direction movement control section 42 is configured to enable movement of the imaging section 2 by the second direction movement mechanism 32 when energized.

Further, the second direction movement control section 42 is configured to restrict the movement of the imaging section 2 by the second direction movement mechanism 32 when the energization is stopped. Specifically, as shown in FIG. 8, the second direction movement control section 42 is configured to restrict the rotation of the drive shaft 32c when the energization is stopped. Since the operation (rotation) of the pinion 32b is thereby restricted, the movement of the rack 32d in the second direction is restricted, and the relative movement of the imaging section 2 and the bed 1 by the second direction moving mechanism 32 is restricted. The second direction movement control unit 42 is a so-called electromagnetic brake mechanism.

In the present embodiment, the movement of the imaging section 2 is not restricted by the first direction movement restricting section 41a and the second direction movement control section 42 when the power is supplied. and movement in the second direction. Further, when the energization is stopped, the movement of the imaging unit 2 is restricted by the first direction movement restricting unit 41a and the second direction movement control unit 42, so the movement of the imaging unit 2 by the moving mechanism 3 is restricted. . However, the first direction movement restriction releasing portion 41b allows the second driving force transmission member 31c to idle with respect to the first driving force transmission member 31b, and only the manual movement of the imaging unit 2 in the first direction is allowed. becomes possible. Therefore, when the energization is stopped, the operator can manually move the imaging unit 2 in the first direction (head-to-foot direction).

Further, the control unit 8 is configured to restrict the movement of the imaging unit 2 in a direction different from the moving direction while the imaging unit 2 is being moved by the moving mechanism 3 at the time of energization. Specifically, when the moving mechanism 3 moves the imaging unit 2 in the first direction during power supply, the control unit 8 causes the second direction movement control unit 42 to move the imaging unit 2 in the second direction. restrict movement to Further, when the moving mechanism 3 moves the imaging unit 2 in the second direction during power supply, the control unit 8 controls the movement of the imaging unit 2 in the first direction by the first direction movement restricting unit 41a. to regulate.

(Effect of this embodiment)
The following effects can be obtained in this embodiment.

As described above, the image diagnostic apparatus 100 of the present invention has the bed 1 on which the subject 101 is placed and the opening 21a, and the diagnosis target region of the subject 101 placed on the bed 1 is arranged in the opening 21a. The imaging unit 2 that images the diagnostic target region of the subject 101 by detecting the radiation emitted from the diagnostic target region in a state where the radiation is emitted, the first direction that is the head-to-foot direction of the subject 101, and the first direction. By moving at least one of the imaging unit 2 and the bed 1 in a second direction, which is a different direction, the imaging unit 2 and the bed 1 are moved relative to each other, so that the opening 21a is directed in the first direction. A first imaging position 10a, which is an imaging position for imaging a first diagnosis target region of the subject 101 by the imaging unit 2, and a first imaging position 10a of the subject 101, which is a region different from the first diagnosis target region, by the imaging unit 2. a moving mechanism 3 configured to move the imaging unit 2 and the bed 1 relative to each other between a second imaging position 10b, which is an imaging position for imaging the diagnosis target part of the second imaging unit; When the power supply is stopped, the relative movement of the imaging unit 2 and the bed 1 in the second direction is restricted, and the relative movement of the imaging unit 2 and the bed 1 in the first direction is allowed. and a movement control mechanism 4 that enables relative movement of the imaging unit 2 and the bed 1 .

As a result, when the power is supplied, the imaging unit 2 and the bed 1 can be moved relative to each other in the first direction and the second direction. can. Further, when the energization is stopped, the relative movement of the imaging unit 2 and the bed 1 in the second direction different from the first direction is restricted, and the imaging unit 2 and the bed 1 move in the first direction, which is the head-foot direction. Since the bed 1 is configured to be relatively movable, the operator manually moves the imaging unit 2 and the bed 1 relative to each other in the first direction, thereby withdrawing the subject 101 from the opening 21a of the imaging unit 2. be able to. As a result, the subject 101 can be evacuated even when the image diagnostic apparatus 100 is deenergized while the image is being captured with the opening 21a of the imaging unit 2 directed toward the head and feet of the subject 101 . Further, when the energization is stopped, the relative movement of the imaging unit 2 and the bed 1 in the second direction different from the head-foot direction (first direction) is restricted. It is possible to limit the direction of movement in the relative movement to the first direction.

Further, in the above-described embodiment, the following further effects can be obtained by configuring as follows.

That is, in the present embodiment, as described above, the movement control mechanism 4 includes the first direction movement control section 41 that controls the relative movement of the imaging section 2 and the bed 1 in the first direction, and the and a second direction movement control unit 42 that regulates the relative movement of the unit 2 and the bed 1, and the second direction movement control unit 42 controls the moving mechanism 3 to move the image pickup unit in the second direction when the energization is stopped. 2 and the bed 1, and the first direction movement control unit 41 enables the relative movement of the imaging unit 2 and the bed 1 in the first direction when the energization is stopped. is configured to Thereby, when the energization is stopped, the relative movement of the imaging unit 2 and the bed 1 in the first direction is allowed while the relative movement of the imaging unit 2 and the bed 1 in the second direction is restricted. Therefore, when the operator manually relatively moves the imaging unit 2 and the bed 1, the relative movement direction of the imaging unit 2 and the bed 1 can be limited to the first direction (head-foot direction).

Further, in the present embodiment, as described above, the first direction movement control section 41 includes the first direction movement regulation section 41a that regulates the relative movement of the imaging section 2 and the bed 1 in the first direction, and a first direction movement restriction releasing portion 41b that releases the restriction on the relative movement of the imaging portion 2 and the bed 1 to the moving mechanism 3 when the energization is stopped. It is configured to restrict the relative movement of the imaging unit 2 and the bed 1 in one direction. While the relative movement of the unit 2 and the bed 1 is restricted by the first direction movement restricting unit 41a, the imaging unit 2 and the bed 1 can be moved relative to each other in the first direction without using the moving mechanism 3. is configured to As a result, even when the movement of the moving mechanism 3 is restricted by the first direction movement restricting portion 41a, the imaging portion 2 and the bed 1 can be relatively moved in the first direction by the first direction movement restriction canceling portion 41b. Since the state is set, the operator can manually relatively move the imaging unit 2 and the bed 1 in the first direction. As a result, even when the energization is stopped, the operator can manually move the imaging unit 2 and the bed 1 relative to each other in the first direction. can.

Further, in the present embodiment, as described above, the moving mechanism 3 includes the first direction moving mechanism 31 that moves the imaging unit 2 in the first direction. In this case, the movement of the imaging unit 2 by the first direction moving mechanism 31 is restricted by the first direction movement restricting unit 41a, and the imaging unit 2 is moved in the first direction without the first direction moving mechanism 31. configured to allow movement. As a result, even when the energization is stopped, the imaging unit 2 can be moved in the first direction (head-foot direction). 101 can be easily retracted.

Further, in the present embodiment, as described above, the first direction moving mechanism 31 includes the driving portion 31a, the first driving force transmission member 31b connected to the driving portion 31a and transmitting the driving force from the driving portion 31a, A second driving force transmission member 31c that transmits the driving force from the driving portion 31a to the imaging portion 2 via the first driving force transmission member 31b, and the second driving force transmission member 31c is connected to the first driving force transmission member 31b. The first directional movement restricting portion 41a is configured to restrict the operation of the first driving force transmission member 31b when the energization is stopped. The directional movement restriction releasing portion 41b keeps the second driving force transmission member 31c from rotating with respect to the first driving force transmission member 31b when energized, and rotates the second driving force transmission member 31c when the energization is stopped. It is configured to idle with respect to the first driving force transmission member 31b. As a result, the second driving force transmission member 31c idles with respect to the first driving force transmission member 31b when the energization is stopped. Even when the operation of is restricted, the second driving force transmission member 31c can be operated. As a result, since the second driving force transmission member 31c is operable even when the energization is stopped, the operator can manually move the imaging unit 2 in the first direction (head-foot direction).

Further, in the present embodiment, as described above, the movement mechanism 3 includes the second direction movement mechanism 32 that moves the imaging section 2 in the second direction, and the second direction movement control section 42 controls the second direction movement control section 42 when energized. It is configured to enable the movement of the imaging section 2 by the directional movement mechanism 32 and restrict the movement of the imaging section 2 by the second directional movement mechanism 32 when the energization is stopped. As a result, the imaging section 2 can be moved in the second direction by the second direction moving mechanism 32 when the power is supplied. Further, when the energization is stopped, the movement of the imaging unit 2 in the second direction is restricted by the second direction movement control unit 42. Therefore, when the energization is stopped, the imaging unit 2 moves in the second direction ( It is possible to prevent movement in a direction different from the head-foot direction).

Further, in this embodiment, as described above, the position detection unit 5 that detects the position of the imaging unit 2 is further provided, and the moving mechanism 3 detects the position where the position detection unit 5 is provided when the energization is resumed. It is configured to move the imaging unit 2 at the same time. As a result, when the energization resumes, the imaging unit 2 is moved to the position where the position detection unit 5 is provided, so the position where the position detection unit 5 is provided is set as the initial position (origin position). be able to. Therefore, when the operator moves the imaging unit 2 in the first direction after the energization is stopped, regardless of the position of the imaging unit 2 in the first direction, when the energization is resumed. , the imaging unit 2 can be moved to the initial position each time. As a result, when the operator moves the imaging unit 2 in the first direction in order to evacuate the subject 101 when the energization is stopped, it is possible to improve the degree of freedom of the movement position of the imaging unit 2. Therefore, convenience for the operator can be improved.

Further, in the present embodiment, as described above, the first diagnostic target site of the subject 101 is the head 101a of the subject 101, and the second diagnostic target site of the subject 101 is the breast 101b of the subject 101. , the second direction is the vertical direction, the second imaging position 10b is a position where the breast 101b of the subject 101 is imaged with the opening 21a facing the second direction, and the moving mechanism 3 moves the imaging unit 2 to the second direction. By moving in the first direction and the second direction, the imaging position by the imaging section 2 is switched between the first imaging position 10a and the second imaging position 10b. As a result, the head 101a of the subject 101 is imaged in a configuration in which the imaging position of the imaging unit 2 is switched between the first imaging position 10a and the second imaging position 10b, and the head 101a and the breast 101b of the subject 101 are imaged. When the energization is stopped while the subject is being held, the subject 101 can be evacuated from the imaging unit 2 by moving the imaging unit 2 in the first direction. Moreover, since the imaging unit 2 is prevented from moving in the vertical direction, it is possible to prevent the imaging unit 2 from moving due to its own weight. As a result, when the operator manually moves the imaging unit 2 in the first direction, it is possible to prevent the imaging unit 2 from moving in the second direction due to its own weight and preventing the subject 101 from being pinched by the imaging unit 2 . .

Further, in the present embodiment, as described above, the moving mechanism 3 includes the rotation mechanism 33 that rotates the imaging unit 2, and the rotation mechanism 33 moves the imaging unit 2 at the switching position 10c for switching the orientation of the imaging unit 2. configured to rotate. As a result, when imaging the head 101a of the subject 101, the imaging unit 2 is rotated by the rotation mechanism 33 at the switching position 10c so that the imaging unit 2 is moved to the first direction with the opening 21a facing the first direction. By moving in the first direction and the second direction, the subject's 101 head 101a can be easily imaged. When imaging the breast 101b of the subject 101, the imaging unit 2 is rotated by the rotation mechanism 33 at the switching position 10c so that the imaging unit 2 is rotated in the first direction while the opening 21a faces the second direction. and the second direction, the breast 101b of the subject 101 can be easily imaged.

[Modification]
It should be noted that the embodiments disclosed this time should be considered as examples and not restrictive in all respects. The scope of the present invention is indicated by the scope of claims rather than the description of the above-described embodiments, and includes all modifications (modifications) within the scope and meaning equivalent to the scope of claims.

For example, in the above-described embodiment, an example was shown in which the bed and the imaging unit are moved relative to each other by moving the imaging unit with the movement mechanism in order to move the relative position between the bed and the imaging unit. is not limited to this. For example, by moving the bed, the bed and the imaging unit may be moved relative to each other. Alternatively, the bed and the imaging unit may be configured to move relative to each other by moving both the bed and the imaging unit.

Further, in the above-described embodiment, when the energization is stopped and the second driving force transmission member is brought into a state of idle rotation with respect to the first driving force transmission member, the first direction movement restricting portion is controlled by the first driving force. Although an example of the configuration for restricting the operation of the transmission member has been shown, the present invention is not limited to this. For example, when the first movement direction movement restricting section causes the second driving force transmission member to idle with respect to the first driving force transmission member when the energization is stopped, the first direction movement restriction canceling section , the operation of the first driving force transmission member may not be restricted.

Further, in the above-described embodiment, an example of a configuration in which the movement control mechanism enables the movement of the imaging unit in the first direction when power supply is stopped has been described, but the present invention is not limited to this. For example, the movement control mechanism may be configured to allow movement of the bed in the first direction when de-energized.

[Aspect]
It will be appreciated by those skilled in the art that the exemplary embodiments described above are specific examples of the following aspects.

(Item 1)
a bed on which the subject is placed;
An opening is provided, and radiation emitted from the diagnosis target region of the subject placed on the bed is detected in a state in which the diagnosis target region is arranged in the opening, thereby detecting the diagnosis target region of the subject. an imaging unit for imaging the
By moving at least one of the imaging unit and the bed in a first direction that is the head and foot direction of the subject and a second direction that is different from the first direction, the imaging unit and a first imaging position, which is an imaging position for imaging the first diagnosis target region of the subject by the imaging unit with the opening facing the first direction by relatively moving the bed; a movement mechanism configured to relatively move the imaging unit and the bed between a second imaging position that is an imaging position for imaging the second diagnosis target region of the subject by the imaging unit; ,
Relative movement of the image capturing unit and the bed in the first direction and the second direction is allowed when the current is applied, and relative movement of the image capturing unit and the bed in the second direction when the current is stopped. and a movement control mechanism that allows relative movement of the imaging unit and the bed in the first direction.

(Item 2)
The movement control mechanism includes a first direction movement control section that controls relative movement of the imaging section and the bed in the first direction, and a control of relative movement of the imaging section and the bed in the second direction. a second directional movement control unit;
The second direction movement control unit is configured to restrict relative movement of the imaging unit and the bed in the second direction by the moving mechanism when the energization is stopped,
The image diagnostic apparatus according to item 1, wherein the first direction movement control section is configured to enable relative movement of the imaging section and the bed in the first direction when power supply is stopped. .

(Item 3)
The first direction movement control section includes a first direction movement regulation section that regulates relative movement of the imaging section and the bed in the first direction, and a relative movement of the imaging section and the bed in the first direction. a first direction movement restriction release unit that releases the restriction of
The first direction movement restricting unit is configured to restrict relative movement of the imaging unit and the bed in the first direction by the moving mechanism when the energization is stopped,
The first direction movement restriction canceling section is configured so that when the energization is stopped, relative movement of the imaging section and the bed in the first direction by the moving mechanism is restricted by the first direction movement restriction section. 3. The diagnostic imaging apparatus according to item 2, wherein the imaging unit and the bed can be moved relative to each other in the first direction without using the moving mechanism.

(Item 4)
The movement mechanism includes a first direction movement mechanism that moves the imaging unit in the first direction,
The first direction movement restriction releasing section is configured to release the first direction movement mechanism in a state in which movement of the imaging section by the first direction movement mechanism is restricted by the first direction movement restriction section when energization is stopped. 4. The diagnostic imaging apparatus according to item 3, wherein the imaging unit is configured to be movable in the first direction without intervening.

(Item 5)
The first direction movement mechanism includes a driving section, a first driving force transmission member connected to the driving section and transmitting a driving force from the driving section, and a driving force from the driving section via the first driving force transmission member. a second driving force transmission member that transmits the driving force of to the imaging unit; and a holding member that holds the second driving force transmission member to be rotatable with respect to the first driving force transmission member,
The first directional movement restricting portion is configured to restrict the operation of the first driving force transmission member when energization is stopped,
The first directional movement restriction canceling portion maintains the second driving force transmission member in a state in which it does not idle with respect to the first driving force transmission member when energized, and when energization is stopped, the second driving force transmission is performed. 5. The diagnostic imaging apparatus according to item 4, wherein the member is configured to idle with respect to the first driving force transmission member.

(Item 6)
the moving mechanism includes a second direction moving mechanism for moving the imaging unit in the second direction;
The second direction movement control section enables movement of the imaging section by the second direction movement mechanism when energized, and restricts movement of the imaging section by the second direction movement mechanism when energization is stopped. The diagnostic imaging apparatus according to any one of items 3 to 5, which is configured as follows.

(Item 7)
Further comprising a position detection unit that detects the position of the imaging unit,
The image diagnosis according to any one of items 1 to 6, wherein the movement mechanism is configured to move the imaging unit to a position where the position detection unit is provided when the energization is resumed. Device.

(Item 8)
The first diagnosis target site of the subject is the subject's head,
The second diagnosis target site of the subject is the breast of the subject,
the second direction is a vertical direction;
The second imaging position is a position for imaging the breast of the subject with the opening directed in the second direction,
The moving mechanism is configured to switch an imaging position of the imaging unit between the first imaging position and the second imaging position by moving the imaging unit in the first direction and the second direction. The diagnostic imaging apparatus according to item 7, wherein

(Item 9)
The moving mechanism includes a rotating mechanism that rotates the imaging unit,
9. The diagnostic imaging apparatus according to item 8, wherein the rotation mechanism is configured to rotate the imaging unit at a switching position for switching the posture of the imaging unit.

1 Bed 2 Imaging Unit 3 Moving Mechanism 4 Movement Control Mechanism 5 Position Detecting Unit 10a First Imaging Position 10b Second Imaging Position 20d Switching Position 21a Opening 31 First Direction Moving Mechanism 31a Driving Unit 31b First Driving Force Transmission Member 31c Second Driving force transmission member 31d Holding member 32 Second direction movement mechanism 33 Rotation mechanism 41 First direction movement control unit 41a First direction movement regulation unit 41b First direction movement regulation releasing unit 42 Second direction movement control unit 100 Diagnostic imaging apparatus 101 Subject 101a head (first diagnostic target part)
101b breast (second diagnostic target site)

Claims (9)

a bed on which the subject is placed;
An opening is provided, and radiation emitted from the diagnosis target region of the subject placed on the bed is detected in a state in which the diagnosis target region is arranged in the opening, thereby detecting the diagnosis target region of the subject. an imaging unit for imaging the
By moving at least one of the imaging unit and the bed in a first direction that is the head and foot direction of the subject and a second direction that is different from the first direction, the imaging unit and a first imaging position, which is an imaging position for imaging the first diagnosis target region of the subject by the imaging unit with the opening facing the first direction by relatively moving the bed; a movement mechanism configured to relatively move the imaging unit and the bed between a second imaging position that is an imaging position for imaging the second diagnosis target region of the subject by the imaging unit; ,
Relative movement of the image capturing unit and the bed in the first direction and the second direction is allowed when the current is applied, and relative movement of the image capturing unit and the bed in the second direction when the current is stopped. and a movement control mechanism that allows relative movement of the imaging unit and the bed in the first direction. The movement control mechanism includes a first direction movement control section that controls relative movement of the imaging section and the bed in the first direction, and a relative movement of the imaging section and the bed in the second direction. a second directional movement control unit;
The second direction movement control unit is configured to restrict relative movement of the imaging unit and the bed in the second direction by the moving mechanism when the energization is stopped,
2. The diagnostic imaging according to claim 1, wherein said first direction movement control section is configured to enable relative movement of said imaging section and said bed in said first direction when energization is stopped. Device. The first direction movement control section includes a first direction movement regulation section that regulates relative movement of the imaging section and the bed in the first direction, and a relative movement of the imaging section and the bed in the first direction. a first direction movement restriction release unit that releases the restriction of
The first direction movement restricting unit is configured to restrict relative movement of the imaging unit and the bed in the first direction by the moving mechanism when the energization is stopped,
The first direction movement restriction canceling section is configured so that when the energization is stopped, relative movement of the imaging section and the bed in the first direction by the moving mechanism is restricted by the first direction movement restriction section. 3. The diagnostic imaging apparatus according to claim 2, wherein said imaging unit and said bed can be moved relative to each other in said first direction without intervening said moving mechanism. The movement mechanism includes a first direction movement mechanism that moves the imaging unit in the first direction,
The first direction movement restriction releasing section is configured to release the first direction movement mechanism in a state in which movement of the imaging section by the first direction movement mechanism is restricted by the first direction movement restriction section when energization is stopped. 4. The diagnostic imaging apparatus according to claim 3, configured to allow movement of said imaging unit in said first direction without intervening. The first direction movement mechanism includes a driving section, a first driving force transmission member connected to the driving section and transmitting a driving force from the driving section, and a driving force from the driving section via the first driving force transmission member. a second driving force transmission member that transmits the driving force of to the imaging unit; and a holding member that holds the second driving force transmission member to be rotatable with respect to the first driving force transmission member,
The first direction movement restricting portion is configured to restrict the operation of the first driving force transmission member when the energization is stopped,
The first directional movement restriction canceling portion maintains the second driving force transmission member in a state in which it does not idle with respect to the first driving force transmission member when energized, and when energization is stopped, the second driving force transmission is performed. 5. The diagnostic imaging apparatus according to claim 4, wherein the member is configured to idle with respect to the first driving force transmission member. the moving mechanism includes a second direction moving mechanism for moving the imaging unit in the second direction;
The second direction movement control section enables movement of the imaging section by the second direction movement mechanism when energized, and restricts movement of the imaging section by the second direction movement mechanism when energization is stopped. The diagnostic imaging apparatus according to any one of claims 3 to 5, which is configured as follows. Further comprising a position detection unit that detects the position of the imaging unit,
7. The image according to any one of claims 1 to 6, wherein the moving mechanism is configured to move the imaging unit to a position where the position detection unit is provided when power supply is resumed. diagnostic equipment. The first diagnosis target site of the subject is the subject's head,
The second diagnosis target site of the subject is the breast of the subject,
the second direction is a vertical direction;
The second imaging position is a position for imaging the breast of the subject with the opening directed in the second direction,
The moving mechanism is configured to switch an imaging position of the imaging unit between the first imaging position and the second imaging position by moving the imaging unit in the first direction and the second direction. 8. The diagnostic imaging apparatus of claim 7, wherein: The moving mechanism includes a rotating mechanism that rotates the imaging unit,
9. The diagnostic imaging apparatus according to claim 8, wherein said rotation mechanism is configured to rotate said imaging unit at a switching position for switching the orientation of said imaging unit.

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