Bed apparatus

Abstract

To reduce the number of components in a mechanism that moves a subject.SOLUTION: A bed apparatus of a medical image diagnostic device comprises a top plate, a first frame, a first rail, and at least one first in-wheel motor. A subject is placed on the top plate. The first frame is provided on the lower side of the top plate. The first rail is provided on the first frame along the longitudinal direction of the top plate. The first in-wheel motor is provided on the top plate and moves the top plate along the first rail relative to the first frame.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The embodiments disclosed in this specification and drawings relate to a sleeper apparatus.

[0002] Conventionally, a bed device of a medical image diagnostic device has a transport mechanism for inserting a tabletop on which a subject is placed into an opening of a gantry device, and a movement mechanism for moving the bed device itself in an orthogonal direction when transporting the subject in an orthogonal direction to the insertion direction.

[0003] However, these mechanisms have a large number of parts, which causes problems such as a large size of the bed apparatus, a heavy weight of the bed apparatus, and high manufacturing costs of the bed apparatus. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-201798 A Summary of the Invention [Problem to be solved by the invention]

[0005] One of the problems to be solved by the embodiments disclosed in this specification and the drawings is to reduce the number of parts in the mechanism for moving the subject. However, the problems to be solved by the embodiments disclosed in this specification and the drawings are not limited to the above problem. Problems corresponding to the effects of each configuration shown in the embodiments described below can also be positioned as other problems. [Means for solving the problem]

[0006] The bed device according to the embodiment is a bed device for a medical image diagnostic apparatus, and includes a top plate, a first frame, a first rail, and at least one first in-wheel motor. A subject is placed on the top plate. The first frame is provided below the top plate. The first rail is provided on the first frame along the longitudinal direction of the top plate. The first in-wheel motor is provided on the top plate and moves the top plate relative to the first frame along the first rail. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing an example of the configuration of an X-ray CT apparatus according to the first embodiment. [Diagram 2] FIG. 2 is a perspective view showing an example of a bed apparatus. [Diagram 3] FIG. 3 is a cross-sectional view showing an example of a bed apparatus. [Figure 4] FIG. 4 is a front view showing an example of a drive unit. [Diagram 5] FIG. 5 is a top view of the top plate. [Figure 6] FIG. 6 is a top view of the top plate. [Figure 7] FIG. 7 is a top view of the top plate. [Figure 8] FIG. 8 is a top view of the top plate. [Figure 9] FIG. 9 is a perspective view illustrating an example of a drive unit according to the first modification. [Figure 10] FIG. 10 is a top view illustrating an example of a drive unit according to the first modification. [Figure 11] FIG. 11 is a top view showing an example of a drive unit according to the first modification. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, the bed apparatus according to the present embodiment will be described with reference to the drawings. In the following embodiments, parts with the same reference numerals perform the same operations, and redundant description will be omitted as appropriate.

[0009] (First embodiment) 1 is a diagram showing an example of the configuration of an X-ray CT apparatus 1 according to the first embodiment. As shown in FIG. 1, the X-ray CT apparatus 1 includes a gantry device 10, a bed device 30, and a console device 40.

[0010] 1, the rotation axis of the rotating frame 13 in a non-tilted state or the longitudinal direction of the top board 33 of the bed device 30 is defined as the Z-axis direction. The axial direction that is perpendicular to the Z-axis direction and horizontal to the floor surface is defined as the X-axis direction. The axial direction that is perpendicular to the Z-axis and X-axis directions and perpendicular to the floor surface is defined as the Y-axis direction. For the sake of explanation, FIG. 1 illustrates the gantry device 10 from multiple directions, and shows a case where the X-ray CT device 1 has one gantry device 10.

[0011] The gantry 10 includes an X-ray tube 11, an X-ray detector 12, a rotating frame 13, an X-ray high voltage device 14, a control device 15, a wedge 16, a collimator 17, and a DAS (Data Acquisition System) 18. The gantry 10 is also called a gantry.

[0012] The X-ray tube 11 is a vacuum tube having a cathode (filament) that generates thermoelectrons and an anode (target) that generates X-rays upon impact of the thermoelectrons. The X-ray tube 11 generates X-rays to be irradiated onto the subject P by irradiating thermoelectrons from the cathode to the anode upon application of high voltage from the X-ray high voltage device 14. For example, the X-ray tube 11 may be a rotating anode type X-ray tube that generates X-rays by irradiating a rotating anode with thermoelectrons.

[0013] The X-ray detector 12 has a plurality of detection elements that detect X-rays. Each detection element in the X-ray detector 12 detects X-rays irradiated from the X-ray tube 11 and passing through the subject P, and outputs a signal corresponding to the detected X-ray dose to the DAS 18. The X-ray detector 12 has, for example, a plurality of detection element rows in which a plurality of detection elements are arranged in a channel direction (channel direction) along an arc centered on the focus of the X-ray tube 11. The X-ray detector 12 has a structure in which, for example, a plurality of detection element rows in which a plurality of detection elements are arranged in the channel direction are arranged in a row direction (slice direction, row direction).

[0014] For example, the X-ray detector 12 is an indirect conversion type detector having a grid, a scintillator array, and an optical sensor array. The scintillator array has a plurality of scintillators. The scintillator has a scintillator crystal that outputs light with a photon amount corresponding to the amount of incident X-rays. The grid is disposed on the X-ray incident side of the scintillator array, and has an X-ray shielding plate that absorbs scattered X-rays. The grid may also be called a collimator (one-dimensional collimator or two-dimensional collimator). The optical sensor array has a function of converting the amount of light from the scintillator into an electrical signal corresponding to the amount of light, and has an optical sensor such as a photodiode. The X-ray detector 12 may be a direct conversion type detector having a semiconductor element that converts the incident X-ray into an electrical signal.

[0015] The rotating frame 13 is an annular frame that supports the X-ray tube 11 and the X-ray detector 12 facing each other and rotates the X-ray tube 11 and the X-ray detector 12 by the control device 15. For example, the rotating frame 13 is a casting made of aluminum. The rotating frame 13 can further support the X-ray high voltage device 14, the wedge 16, the collimator 17, the DAS 18, and the like in addition to the X-ray tube 11 and the X-ray detector 12. The rotating frame 13 can further support various components not shown in FIG. 1. The various components supported by the rotating frame 13 will be described later. The rotating frame 13 is also referred to as a rotating base, a rotating body, and the like. In the gantry device 10, the rotating frame 13 and a portion that rotates together with the rotating frame 13 are also referred to as a rotating portion.

[0016] X-ray high voltage device 14 has electric circuits such as a transformer and a rectifier, and includes a high voltage generator that generates a high voltage to be applied to X-ray tube 11, and an X-ray control device that controls the output voltage according to the X-rays generated by X-ray tube 11. The high voltage generator may be of a transformer type or an inverter type. X-ray high voltage device 14 may be provided on rotating frame 13 or on a fixed frame. The fixed frame is a frame that rotatably supports rotating frame 13.

[0017] The control device 15 has a processing circuit having a CPU (Central Processing Unit) and the like, and a driving mechanism such as a motor and an actuator. The control device 15 receives an input signal from the input interface 43 and controls the operation of the gantry 10 and the bed 30. For example, the control device 15 controls the rotation of the rotating frame 13, the tilt of the gantry 10, the operation of the bed 30 and the tabletop 33, and the like. As an example, the control device 15 rotates the rotating frame 13 around an axis parallel to the X-axis direction according to input inclination angle (tilt angle) information as a control for tilting the gantry 10. The control device 15 may be provided in the gantry 10 or in the console device 40.

[0018] The wedge 16 is a filter for adjusting the amount of X-rays irradiated from the X-ray tube 11. Specifically, the wedge 16 is a filter that transmits and attenuates the X-rays irradiated from the X-ray tube 11 so that the X-rays irradiated from the X-ray tube 11 to the subject P have a predetermined distribution. For example, the wedge 16 is a wedge filter or a bow-tie filter, which is a filter made of processed aluminum or the like so as to have a predetermined target angle and a predetermined thickness.

[0019] The collimator 17 is a lead plate or the like for narrowing down the irradiation range of the X-rays transmitted through the wedge 16, and a slit is formed by combining a plurality of lead plates or the like. The collimator 17 may also be called an X-ray aperture. Although FIG. 1 shows a case where the wedge 16 is disposed between the X-ray tube 11 and the collimator 17, the collimator 17 may also be disposed between the X-ray tube 11 and the wedge 16. In this case, the wedge 16 transmits and attenuates the X-rays that are emitted from the X-ray tube 11 and whose irradiation range is limited by the collimator 17.

[0020] The DAS 18 collects X-ray signals detected by each detection element of the X-ray detector 12. For example, the DAS 18 has an amplifier that performs an amplification process on the electrical signal output from each detection element, and an A / D converter that converts the electrical signal into a digital signal, and generates detection data.

[0021] The bed device 30 is a device on which the subject P to be imaged is placed and moved, and includes a base 31, a bed driving device 32, a top plate 33, and a support frame 34. The base 31 is a housing that supports the support frame 34 so that it can move in the vertical direction. The bed driving device 32 is a drive mechanism that moves the top plate 33 on which the subject P is placed, in the longitudinal direction of the top plate 33, and includes a motor, an actuator, etc. The top plate 33, which is provided on the upper surface of the support frame 34, is a plate on which the subject P is placed. Note that the bed driving device 32 may move the support frame 34 in the longitudinal direction of the top plate 33 in addition to the top plate 33.

[0022] The console device 40 has a memory 41, a display 42, an input interface 43, and a processing circuit 44. Although the console device 40 will be described as being separate from the gantry device 10, the gantry device 10 may include the console device 40 or some of the components of the console device 40.

[0023] The memory 41 is realized by, for example, a semiconductor memory element such as a RAM (Random Access Memory), a flash memory, a hard disk, an optical disk, etc. The memory 41 stores, for example, projection data and CT image data. Also, for example, the memory 41 stores a program for enabling a circuit included in the X-ray CT apparatus 1 to realize its function. Note that the memory 41 may be realized by a server group (cloud) connected to the X-ray CT apparatus 1 via a network.

[0024] The display 42 displays various types of information. For example, the display 42 displays various images generated by the processing circuit 44, or displays a GUI (Graphical User Interface) for receiving various operations from an operator. For example, the display 42 is a liquid crystal display or a CRT (Cathode Ray Tube) display. The display 42 may be provided on the pedestal device 10. The display 42 may be a desktop type, or may be configured as a tablet terminal or the like capable of wireless communication with the console device 40 main body.

[0025] The input interface 43 receives various input operations from an operator, converts the received input operations into electrical signals, and outputs the electrical signals to the processing circuitry 44. For example, the input interface 43 receives input operations from the operator, such as reconstruction conditions for reconstructing CT image data and image processing conditions for generating post-processed images from CT image data. For example, the input interface 43 is realized by a mouse, a keyboard, a trackball, a switch, a button, a joystick, a touchpad for performing input operations by touching an operation surface, a touchscreen in which a display screen and a touchpad are integrated, a non-contact input circuit using an optical sensor, a voice input circuit, and the like. The input interface 43 may be provided in the gantry device 10. The input interface 43 may also be configured as a tablet terminal or the like capable of wireless communication with the console device 40 main body. The input interface 43 is not limited to only those having physical operation parts such as a mouse and a keyboard. For example, an electrical signal processing circuit that receives an electrical signal corresponding to an input operation from an external input device provided separately from the console device 40 and outputs the electrical signal to the processing circuitry 44 is also included in the input interface 43.

[0026] The processing circuitry 44 controls the operation of the entire X-ray CT device 1. For example, the processing circuitry 44 has a system control function 440, a scan control function 441, a pre-processing function 442, a reconstruction processing function 443, and a display control function 444. In the embodiment, each processing function performed by the system control function 440, the scan control function 441, the pre-processing function 442, the reconstruction processing function 443, and the display control function 444 is stored in the memory 41 in the form of a program executable by a computer. The processing circuitry 44 is a processor that realizes a function corresponding to each program by reading the program from the memory 41 and executing it. In other words, the processing circuitry 44 in a state in which each program has been read has each function shown in the processing circuitry 44 in FIG. 1.

[0027] 1, the system control function 440, the scan control function 441, the preprocessing function 442, the reconstruction processing function 443, and the display control function 444 are realized by a single processor, but it is also possible to combine multiple independent processors to configure the processing circuit 44 and have each processor execute a program to realize the function. Also, in FIG. 1, it is described that a single storage circuit such as the memory 41 stores a program corresponding to each processing function, but it is also possible to dispose multiple storage circuits in a distributed manner and have the processing circuit 44 read out the corresponding program from each storage circuit.

[0028] The term "processor" used in the above description refers to a circuit such as a CPU (Central Processing Unit), a GPU (Graphical Processing Unit), an Application Specific Integrated Circuit (ASIC), a programmable logic device (e.g., a Simple Programmable Logic Device (SPLD), a Complex Programmable Logic Device (CPLD), and a Field Programmable Gate Array (FPGA)). The processor achieves its function by reading and executing a program stored in the memory 41. Note that instead of storing a program in the memory 41, the processor may be configured to directly incorporate the program into its circuit. In this case, the processor achieves its function by reading and executing the program incorporated in the circuit.

[0029] The system control function 440 controls various functions of the processing circuit 44 based on input operations received from an operator via the input interface 43 .

[0030] The system control function 440 also controls the movement of the table 33 of the bed device 30. More specifically, the system control function 440 controls a drive unit 331 (see FIG. 2) described later. For example, the system control function 440 controls the rotation speed of an in-wheel motor included in the drive unit 331 and the traveling direction of the in-wheel motor.

[0031] The scan control function 441 executes a scan using X-rays on the subject P. For example, the scan control function 441 controls the scan based on an input operation received from an operator via the input interface 43. Specifically, the scan control function 441 controls the output voltage from the high voltage generator by transmitting a control signal to the X-ray high voltage device 14 based on the input operation. In addition, the scan control function 441 controls data collection by the DAS18 by transmitting a control signal to the DAS18.

[0032] The pre-processing function 442 generates pre-processed data by performing pre-processing on the X-ray detection data transmitted from the DAS 18. Specifically, the pre-processing function 442 generates pre-processed data by performing correction processes such as logarithmic conversion, offset correction, sensitivity correction, and beam hardening correction. Note that the data before pre-processing (X-ray detection data) and the data after pre-processing may be collectively referred to as projection data.

[0033] The reconstruction processing function 443 generates CT image data by reconstructing the projection data generated by the pre-processing function 442 using various reconstruction methods (for example, back projection methods such as FBP (Filtered Back Projection), iterative approximation, etc.). In addition, the reconstruction processing function 443 stores the generated CT image data in the memory 41.

[0034] The display control function 444 causes various images generated by the processing circuitry 44 to be displayed on the display 42. For example, the display control function 444 causes the display 42 to display CT image data generated by the reconstruction processing function 443.

[0035] Next, a transport mechanism for the tabletop 33 in the bed device 30 of the X-ray CT apparatus 1 will be described.

[0036] Fig. 2 is a perspective view showing an example of the bed apparatus 30. Fig. 3 is a cross-sectional view showing an example of the bed apparatus 30. The subject P is placed on the top board 33. The top board 33 is placed on the upper surface of a support frame 34. The top board 33 has an upper surface on which the subject P is placed, which is sunken downward into an arc shape.

[0037] The support frame 34 is provided below the top plate 33. The support frame 34 is an example of a first frame. The support frame 34 has a groove 341 that is approximately parallel to the Z-axis direction at approximately the center of the surface facing the top plate 33. That is, the groove 341 is formed in the front-rear direction in which the subject P is inserted into and removed from the opening of the gantry device 10. The groove 341 also has front-rear rails 342 that are approximately parallel to the groove 341.

[0038] The front-rear rail 342 is provided on the support frame 34 along the longitudinal direction of the tabletop 33. The front-rear rail 342 is an example of a first rail. The front-rear rail 342 guides the transportation of the tabletop 33 in the longitudinal direction of the tabletop 33, i.e., in the Z-axis direction. The front-rear rail 342 has a smooth surface. The front-rear rail 342 slides on the surface of the first clamping unit 332 while being clamped by the first clamping unit 332 described below. In this way, the front-rear rail 342 guides the transportation of the tabletop 33.

[0039] The support frame 34 has a first support portion 343a (see FIG. 5) and a second support portion 343b (see FIG. 5) on a surface facing the top board 33. The first support portion 343a and the second support portion 343b are arranged on the side of the bed device 30 where the gantry device 10 is installed.

[0040] The first support portion 343a and the second support portion 343b are spherical members disposed between the top plate 33 and the support frame 34, and support the top plate 33 so as to be movable in any direction. The first support portion 343a or the second support portion 343b is an example of a support portion. More specifically, the first support portion 343a and the second support portion 343b are realized by a ball roller having a sphere and a support portion that rotatably supports the sphere. The first support portion 343a and the second support portion 343b are disposed so that the sphere comes into contact with the top plate 33. As a result, the first support portion 343a and the second support portion 343b support the top plate 33 so as to be movable in any direction.

[0041] The surface of the top plate 33 facing the support frame 34 has a flat portion that comes into contact with the first support portion 343a or the second support portion 343b. This prevents the top plate 33 from moving upward or downward even when the top plate 33 moves in the X-axis direction.

[0042] The top board 33 has a first driving section 331 a , a second driving section 331 b , a first clamping section 332 , left and right rails 333 , and a second clamping section 334 .

[0043] The first driving unit 331a and the second driving unit 331b are disposed on the opposite side of the table top 33 from the side on which the gantry device 10 is installed, at positions symmetrical with respect to the groove 341. The first driving unit 331a and the second driving unit 331b have an in-wheel motor that supplies power for transporting the table top 33. For example, the in-wheel motor supplies power for transporting the table top 33 to the rotating unit 3311, which is a wheel. Hereinafter, when there is no need to distinguish between the first driving unit 331a and the second driving unit 331b, they will be referred to as driving units 331.

[0044] The first clamping unit 332 clamps the front-rear rail 342 from the width direction of the front-rear rail 342. That is, the first clamping unit 332 holds the front-rear rail 342 so as not to come off the front-rear rail 342. In addition, the surface of the first clamping unit 332 that comes into contact with the front-rear rail 342 is formed smoothly. As a result, when the drive unit 331 rotates in the Z-axis direction, the first clamping unit 332 slides on the surface of the front-rear rail 342, thereby moving along the front-rear rail 342.

[0045] The left and right rails 333 are fixed at approximately the center to the first clamping unit 332. The left and right rails 333 are formed in a direction perpendicular to the front and rear rails 342. The left and right rails 333 are an example of a second rail. The left and right rails 333 guide the transportation of the top board 33 in the short side direction of the top board 33, i.e., in the X-axis direction. The left and right rails 333 have a smooth surface. The left and right rails 333 slide over the surface of the second clamping unit 334 while being clamped by the second clamping unit 334 described below.

[0046] The second clamping portion 334 clamps the left and right rails 333 from the short side direction of the left and right rails 333. That is, the second clamping portion 334 holds the left and right rails 333 so as not to come off the rails. In addition, the surface of the second clamping portion 334 that comes into contact with the left and right rails 333 is formed smoothly. As a result, when the driving portion 331 rotates in the X-axis direction, the second clamping portion 334 slides on the surface of the left and right rails 333 and moves along the left and right rails 333.

[0047] Next, the drive unit 331 will be described in detail.

[0048] 4 is a front view showing an example of the driving unit 331. The driving unit 331 includes a turning unit 3313, a connecting unit 3312, and a rotating unit 3311.

[0049] The turning unit 3313 changes the traveling direction of the top board 33 by rotating. The turning unit 3313 rotates the drive unit 331 about a rotation axis that is approximately parallel to the Y-axis direction. For example, the rotation unit 3311 is realized by a motor such as a servo motor. The turning unit 3313 changes the traveling direction of the top board 33 by rotating the drive unit 331.

[0050] The connecting portion 3312 connects the turning portion 3313 and the rotating portion 3311. The connecting portion 3312 is formed in a columnar shape. Here, the turning portion 3313 is connected to the top plate 33. That is, the connecting portion 3312 is a columnar member that connects the top plate 33 and the rotating portion 3311 via the turning portion 3313. The connecting portion 3312 is an example of a first connecting portion. The connecting portion 3312 rotatably supports the rotating portion 3311 that rotates about a rotation axis approximately parallel to the X-axis direction. The connecting portion 3312 transmits the rotation of the turning portion 3313 to the rotating portion 3311 by a gear or the like.

[0051] The rotating unit 3311 rotates about a rotation axis substantially parallel to the X-axis direction. For example, the rotating unit 3311 is realized by an in-wheel motor. The rotating unit 3311 is provided on the top plate 33 and moves the top plate 33 relative to the support frame 34 along the front and rear rails 342. The rotating unit 3311 is an example of a first in-wheel motor. The rotating unit 3311 is also provided on the top plate 33 and moves the top plate 33 relative to the support frame 34 along the left and right rails 333. At least one rotating unit 3311 is provided on the top plate 33. More specifically, the rotating unit 3311 has an in-wheel motor inside a wheel the periphery of which is covered by a tire such as rubber. Since the periphery of the rotating unit 3311 is covered by an elastic body such as rubber, it is possible to suppress transmission of vibrations of the in-wheel motor.

[0052] Furthermore, the drive unit 331 is detachably connected to the top board 33. This allows maintenance personnel to remove the drive unit 331 from the top board 33 to perform maintenance.

[0053] Next, the transportation of the tabletop 33 in the bed device 30 will be described.

[0054] Fig. 5 is a top view of the top plate 33 as viewed from above. Fig. 6 is a top view of the top plate 33 as viewed from above. Fig. 7 is a top view of the top plate 33 as viewed from above. Fig. 8 is a top view of the top plate 33 as viewed from above.

[0055] Fig. 5 shows a state in which the tabletop 33 is disposed at an initial position. That is, this shows the initial state in which the driving unit 331 is not moving the tabletop 33. Fig. 6 shows a state in which the tabletop 33 is being moved in the direction of the arrow in Fig. 6. The driving unit 331 moves in the Z-axis direction. Therefore, when the rotating unit 3311 rotates, the first clamping unit 332 slides on the surface of the front-rear rail 342, and the tabletop 33 moves in the direction of the arrow in Fig. 6.

[0056] Fig. 7 shows the state in which the top plate 33 is being moved in the direction of the arrow in Fig. 7. The turning unit 3313 rotates the driving unit 331 by 90 degrees clockwise. This causes the moving direction of the driving unit 331 to be oriented in the X-axis direction. Therefore, when the rotating unit 3311 rotates, the second clamping unit 334 slides on the surfaces of the left and right rails 333, and the top plate 33 moves in the direction of the arrow in Fig. 7.

[0057] Fig. 8 shows a state in which the tabletop 33 is being moved in the direction of the arrow in Fig. 8. The turning unit 3313 rotates the driving unit 331 counterclockwise by 90 degrees. This causes the moving direction of the driving unit 331 to be oriented in the Z-axis direction. Therefore, when the rotating unit 3311 rotates, the first clamping unit 332 slides on the surface of the front-rear rail 342, and the tabletop 33 moves in the direction of the arrow in Fig. 8.

[0058] As described above, the bed apparatus 30 according to the first embodiment includes the support frame 34 provided under the top board 33 on which the subject P is placed, and the front-rear rails 342 provided on the support frame 34 along the longitudinal direction of the top board 33. The top board 33 includes at least one in-wheel motor that moves the top board 33 relative to the front-rear rails 342 along the front-rear rails 342. In this manner, the bed apparatus 30 moves the top board 33 in the Z-axis direction and the X-axis direction by the in-wheel motor. This allows the bed apparatus 30 to have a smaller number of parts than a conventional mechanism for moving the top board 33. That is, the bed apparatus 30 allows the mechanism for moving the subject P to have a smaller number of parts.

[0059] Furthermore, the reduced number of parts reduces the weight of the bed device 30, reducing design and manufacturing costs. Furthermore, the bed device 30 does not use a drive motor or ball screw, which are sources of large vibration and noise, and therefore noise and vibration can be reduced.

[0060] (Variation 1) In the driving unit 331 according to the first embodiment, the rotating unit 3311 is disposed on the extension line of the rotation axis of the turning unit 3313. In the rotating unit 3311 according to the first modification, the rotating unit 3311 is disposed at a position deviated from the extension line of the rotation axis of the driving unit 331.

[0061] Fig. 9 is a perspective view showing an example of a drive unit 331 according to Modification 1. Fig. 10 is a top view showing an example of a drive unit 331 according to Modification 1. Fig. 11 is a top view showing an example of a drive unit 331 according to Modification 1. Fig. 11 also shows a state rotated 90 degrees counterclockwise from Fig. 10.

[0062] The connecting portion 3312 is formed in an L-shape. The connecting portion 3312 is an example of a second connecting portion. The connecting portion 3312 is connected to the rotating portion 3311 from the side. The connecting portion 3312 is an L-shaped member that connects the top plate 33 and the rotating portion 3311 via the turning portion 3313. The connecting portion 3312 according to the first embodiment needs to be larger than the radius of the rotating portion 3311 in order to rotatably support the rotating portion 3311 from above. However, the connecting portion 3312 according to the first modification is connected to the rotating portion 3311 from the side. Therefore, it is sufficient that the length in the Y-axis direction of the turning portion 3313 and the connecting portion 3312 combined is larger than the radius of the rotating portion 3311. Therefore, the driving portion 331 according to the first modification can narrow the gap between the top plate 33 and the support frame 34 more than the driving portion 331 according to the first embodiment.

[0063] (Variation 2) The bed device 30 may include a first detector that detects the current position of the tabletop 33 on the front-rear rails 342, and a second detector that detects the current position of the tabletop 33 on the left-right rails 333. The first detector and the second detector are realized by, for example, a linear encoder.

[0064] For example, the first detection unit is provided in the first clamping unit 332. The front-rear rail 342 has a scale that is read optically or magnetically. The first detection unit detects the position of the tabletop 33 on the front-rear rail 342 by reading the scale on the front-rear rail 342. Similarly, the second detection unit is provided in the second clamping unit 334. The left-right rail 333 has an optical or magnetic scale. The first detection unit detects the position of the tabletop 33 on the left-right rail 333 by reading the scale on the left-right rail 333. Note that the bed device 30 is not limited to having both the first detection unit and the second detection unit, and may have either one of them.

[0065] (Variation 3) In the bed apparatus 30 according to the first embodiment, the first driving unit 331a and the second driving unit 331b each have one in-wheel motor. However, the bed apparatus 30 is not limited to having two in-wheel motors, and may have one in-wheel motor. In other words, either the first driving unit 331a or the second driving unit 331b may not have an in-wheel motor. Furthermore, the bed apparatus 30 may have three or more in-wheel motors.

[0066] (Variation 4) The rotating unit 3311 of the driving unit 331 according to the first embodiment is formed in an annular shape. That is, the rotating unit 3311 is formed in a tire shape. The rotating unit, which is an in-wheel motor according to the fourth modification, may be housed in a wheel formed in a spherical shape. The in-wheel motor rotates in the X-axis direction and the Z-axis direction. This allows the driving unit to change its traveling direction without being turned by the turning unit 3313.

[0067] (Variation 5) The driving unit 331 according to the first embodiment moves the top board 33 in the X-axis direction or the Z-axis direction. The driving unit 331 according to the fifth modification may move the top board 33 in an oblique direction between the X-axis direction and the Z-axis direction.

[0068] (Variation 6) The driving unit 331 according to the first embodiment moves the top board 33 in the X-axis direction or the Z-axis direction. The driving unit 331 according to the sixth modification may move the top board 33 in the Z-axis direction. In other words, the driving unit 331 may not move the top board 33 in the X-axis direction. More specifically, the top board 33 may not have the second clamping unit 334 and the left and right rails 333.

[0069] (Variation 7) The driving unit 331 according to the first embodiment moves the top board 33 in the X-axis direction or the Z-axis direction. The driving unit 331 according to the seventh modification may move the top board 33 in the X-axis direction. In other words, the driving unit 331 may not move the top board 33 in the Z-axis direction. More specifically, the top board 33 may not have the first clamping unit 332 and the front-rear rails 342.

[0070] (Variation 8) The bed apparatus 30 according to the eighth modification does not need to have the left and right rails 333 and the second clamping unit 334 between the top board 33 and the support frame 34. The bed apparatus 30 may have a drive unit between the base 31 and the support frame 34 for moving the support frame 34 in the X-axis direction.

[0071] More specifically, the base 31 supports the support frame 34. The base 31 is an example of a second frame. The bed device 30 has a straight rail between the base 31 and the support frame 34, the straight rail being perpendicular to the front-rear rail 342. For example, the straight rail is provided on the base 31. The support frame 34 has a rotating unit 3311 which is at least one in-wheel motor that moves the support frame 34 along the straight rail. The rotating unit 3311 is an example of a second in-wheel motor. For example, the support frame 34 has at least one driving unit 331 between the base 31 and the support frame 34 that moves the support frame 34 along the straight rail.

[0072] (Variation 9) The bed device 30 according to the first embodiment may be a bed for a medical image diagnostic device other than the X-ray CT device 1. The other medical image diagnostic device may be various medical image diagnostic devices such as an MRI (Magnetic Resonance Imaging) device, a SPECT (Single Photon Emission Computed Tomography) device, a PET (Positron Emission computed Tomography) device, a SPECT-CT device in which a SPECT device and an X-ray CT device are integrated, and a PET-CT device in which a PET device and an X-ray CT device are integrated.

[0073] According to at least one of the embodiments described above, the number of parts in the mechanism for moving the subject can be reduced.

[0074] Although some embodiments have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, modifications, and combinations of embodiments can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope of the invention and its equivalents as described in the claims, as well as in the scope and spirit of the invention. [Explanation of symbols]

[0075] 1 X-ray CT device 10 Mounting device 11 X-ray tube 12 X-ray detector 13 Rotating Frame 14 High voltage X-ray device 15 Control device 16 Wedge 17 Collimator 18 DAS(Data Acquisition System) 30 Sleeping device 31 Foundation 32 Bed drive unit 33 Tabletop 34 Support frame 40 Console device 41 Memory 42 Display 43 Input Interface 44 Processing circuit 331 Drive unit 331a First Drive Unit 331b Second Drive Unit 332 First clamping part 333 Left and right rails 334 Second clamping part 341 Groove 342 Front and rear rails 343a 1st support part 343b Second support part 3311 Rotating part 3313 Turning Section 3312 Connection section 440 System Control Functions 441 Scan control function 442 Pre-processing function 443 Reconstruction Processing Function 444 Display control function P Subject

Claims

1. A bed device for a medical image diagnostic device, comprising: A top plate on which a subject is placed; A first frame provided under the top plate; a first rail provided on the first frame along a longitudinal direction of the top plate; at least one first in-wheel motor provided on the top plate and configured to move the top plate relative to the first frame along the first rail; A sleeping device comprising:

2. Further comprising a second rail perpendicular to the first rail, The first in-wheel motor moves the top plate along the second rail. The sleeper apparatus according to claim 1 .

3. a first connecting portion formed in a column shape connecting the top plate and the first in-wheel motor, The sleeper apparatus according to claim 1 .

4. a second connecting portion formed in an L-shape to connect the top plate and the first in-wheel motor, The sleeper apparatus according to claim 1 .

5. The first in-wheel motor is housed in a spherical wheel. The sleeper apparatus according to claim 1 .

6. The apparatus further includes a spherical support portion disposed between the top plate and the first frame and configured to movably support the top plate. The sleeper apparatus according to claim 1 .

7. The surface of the top plate facing the first frame is formed flat. The sleeper apparatus according to claim 6.

8. A second frame supporting the first frame; a second rail between the first frame and the second frame, the second rail being perpendicular to the first rail; at least one second in-wheel motor that moves the first frame along the second rail; The sleeper apparatus according to claim 1 .

9. Further comprising a detection unit that detects a current position of the tabletop on the first rail. The bed apparatus according to any one of claims 1 to 8.

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