JP5677058B2 - Bed apparatus and diagnostic imaging apparatus - Google Patents

Description

  Embodiments described herein relate generally to a bed apparatus and an image diagnostic apparatus used for image diagnosis.

  Image diagnostic apparatuses such as an X-ray CT apparatus, a nuclear medicine diagnostic apparatus, and an X-ray diagnostic apparatus provide image data generated by imaging a subject and play an important role in medical practices such as image diagnosis and treatment Plays. The circulatory X-ray diagnostic apparatus has an X-ray generator and an X-ray detector disposed opposite to the C-shaped end, and includes an X-ray generator and an X-ray detector. The subject is sent between the vessels (opening) and imaging is performed. Further, an image diagnostic apparatus such as an X-ray CT apparatus or a nuclear medicine diagnostic apparatus includes a gantry having an opening, and performs imaging by sending a subject into the opening. A bed apparatus is disposed in the vicinity of the opening. This bed apparatus has a top plate on which the subject is placed, and moves the top plate in the longitudinal direction to send the subject to a position where imaging can be performed in the opening.

  In recent years, for example, an X-ray CT apparatus of an image diagnostic apparatus is desired to be able to accurately position an object and to image the object over a wide range in accordance with improvement in resolution of the X-ray detector. For this reason, the top plate of the bed apparatus is supported by a bed support section disposed on the lower side via a drive unit in which one end portion in the longitudinal direction is cantilevered, and a part of the lower surface is disposed on the bed support table. Supported by a rotatable roller. Then, the top plate is moved in the direction of the gantry by the drive unit, and the portion of the top plate that protrudes from the bed support portion is inserted into the opening, so that most of the subject can be fed into the opening. .

JP 2002-58667 A

  However, the weight of the subject tends to increase, and the load applied to the top plate on which the subject is placed increases, making it difficult to ensure positional accuracy when the top plate is moved in the longitudinal direction. ing.

  The embodiment has been made to solve the above-described problems, and an object thereof is to provide a bed apparatus and an image diagnostic apparatus capable of improving the position accuracy of the top board.

In order to solve the above problem, the bed apparatus of the embodiment includes a top plate on which a subject is placed,
A roller disposed under the top plate and supporting the top plate; a power source for generating power;
A first power transmission mechanism for transmitting force to move the top plate in a longitudinal direction; and the first power transmission
Second power for rotating the roller in the moving direction of the top plate according to the power transmitted to the mechanism
A long manual drive unit including a transmission mechanism and a bed support unit for supporting the longitudinal drive unit are provided .

1 is a block diagram showing a configuration of an X-ray CT apparatus according to an embodiment. The side view which shows an example of the detail of a structure of the bed which concerns on embodiment. The top view which shows an example of the detail of a structure of the long manual drive part which concerns on embodiment. The side view which shows the deflection | deviation of the top plate which moved to the mount part direction which concerns on embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. The embodiment can be applied to an image diagnostic apparatus such as an X-ray CT apparatus, a nuclear medicine diagnostic apparatus, and an X-ray diagnostic apparatus used for image diagnosis, and a bed apparatus. However, in the embodiment described below, An example of a line CT apparatus will be described.

  FIG. 1 is a block diagram showing a configuration of an X-ray CT apparatus according to the embodiment. The X-ray CT apparatus 100 includes an imaging unit 10 that performs imaging of the subject P, a bed unit 40 that moves the subject P in the direction of the imaging unit 10, and an operation that performs input to operate the imaging unit 10 and the bed unit 40. Unit 50 and a system control unit 51 that controls the photographing unit 10 and the bed unit 40 based on input information from the operation unit 50.

  The imaging unit 10 includes a gantry unit 11 that generates projection data by imaging the subject P, and an image processing unit 30 that processes the projection data generated by the gantry unit 11 to generate image data. The gantry unit 11 includes a cylindrical opening 12 into which the subject P is sent by the bed unit 40 and a rotating unit that rotates around the subject P sent into the opening 12 around the isocenter 12a. 13 and a fixing portion 14 that rotatably supports the rotating portion 13.

  The rotation unit 13 is disposed on the outer periphery of the opening 12, and an X-ray irradiation unit 16 that irradiates X-rays, a high voltage generation unit 17 that supplies a high voltage to the X-ray irradiation unit 16, and an X-ray that detects X-rays. The detection unit 18, the data collection unit 19 that collects detection signals detected by the X-ray detection unit 18 to generate projection data, and the projection data generated by the data collection unit 19 are output to the image processing unit 30. A rotating frame 21 that rotatably supports the transmitting unit of the data transmission unit 20, the X-ray irradiation unit 16, the high voltage generation unit 17, the X-ray detection unit 18, the data collection unit 19, and the transmission unit of the data transmission unit 20. And.

  The X-ray irradiation unit 16 includes an X-ray tube, generates X-rays by the high voltage supplied from the high voltage generation unit 17, and rotates while rotating with respect to the subject P sent into the opening 12. Irradiate the line. The X-ray detection unit 18 includes an X-ray detection element and is disposed to face the X-ray irradiation unit 16. Then, X-rays transmitted through the subject P by X-ray irradiation from the X-ray irradiation unit 16 are detected and converted into electrical signals, and the converted signals are amplified and output to the data collection unit 19.

  The data collection unit 19 includes an analog / digital conversion circuit and the like, converts an analog signal from the X-ray detection unit 18 into a digital signal, collects the data at every predetermined rotation angle of the rotation frame 21, and outputs projection data of one view. Is generated.

  The data transmission unit 20 includes a transmission unit and a reception unit for transmitting and receiving, for example, using light. A transmission unit is provided in the rotation unit 13 and transmits projection data from the data collection unit 19 to a reception unit provided in the fixed unit 14.

  The fixing unit 14 includes a rotation mechanism control unit 22 that rotates the rotation frame 21 of the rotation unit 13 and a reception unit of the data transmission unit 20. The rotation mechanism control unit 22 includes a rotation mechanism that rotates the rotation frame 21 and a control circuit that controls the rotation mechanism. In addition, the reception unit of the data transmission unit 20 outputs the projection data from the transmission unit to the image processing unit 30.

  The image processing unit 30 reconstructs the projection data output from the data transmission unit 20 of the rotation unit 13 in the gantry unit 11 and the projection data of a plurality of views stored in the storage unit 31 to reconstruct the image. A reconstruction unit 32 that generates data, and a display unit 33 that displays image data generated by the reconstruction unit 32 are provided.

  The bed unit 40 includes a bed 41 on which the subject P is movably mounted, and a bed control unit 42 that controls the movement of the bed 41. Then, the bed 41 moves the subject P to a position where imaging within the opening 12 in the gantry 11 of the imaging unit 10 is possible.

  The operation unit 50 is an interactive interface including an input device such as a keyboard, a trackball, a joystick, and a mouse, a display panel, and various switches, and the subject P placed on the bed 41 in the bed unit 40 is displayed. An input operation for moving, various input operations related to imaging of the subject P, and the like are performed.

  The system control unit 51 includes a CPU and a storage circuit, temporarily stores input information supplied by an input operation from the operation unit 50, and then, based on these input information, the rotation unit in the gantry unit 11 of the photographing unit 10. Control of the entire system is performed, such as rotation of the 13 rotation frames 21, generation of projection data, generation and display of image data, and control related to movement of the subject P in the bed 40.

Next, with reference to FIG. 1 thru | or FIG. 3, the detail of a structure of the bed 41 of the bed part 40 is demonstrated.
FIG. 2 is a side view showing an example of the detailed configuration of the bed 41. The bed 41 is disposed in the vicinity of the gantry 11 of the imaging unit 10, a top plate 43 on which the subject P is placed, and a roller that is disposed below the top plate 43 and supports a part of the top plate 43. 44 and the top plate 43 are moved and driven in the direction of the arrow L1 which is the direction of the gantry 11 in the longitudinal direction and the direction of the arrow L2 opposite to the L1 direction, and with respect to the top plate 43 as the top plate 43 moves. The long manual drive unit 45 that rotationally drives the roller 44 at a rolling speed in the rolling direction, the bed support unit 46 that supports the long manual drive unit 45, and the bed support unit 46 are moved up and down to move the top plate 43 in the vertical direction. And a vertically moving drive unit 47 that moves.

  The roller 44 is disposed in the vicinity of the end on the gantry 11 side on the bed support 46. Then, in accordance with the movement of the top plate 43 in the L1 direction, the top plate 43 is rotationally driven at a speed of rolling in the direction of the arrow R1, which is the direction of rolling with respect to the top plate 43. Further, in accordance with the movement of the top plate 43 in the L2 direction, the top plate 43 is rotationally driven at a speed of rolling in the direction of the arrow R2 opposite to the R1 direction that is the direction of rolling with respect to the top plate 43.

  FIG. 3 is a top view showing an example of the detailed configuration of the long manual drive unit 45. The long manual drive unit 45 includes a power source 60 such as a servo motor that generates power, a first power transmission mechanism 61 that transmits power from the power source 60 and moves the top plate 43 in the longitudinal direction, A second power transmission mechanism 62 that transmits the power transmitted to the first power transmission mechanism 61 and rotates the roller 44, and two load sensors 63 that measure the load applied to the roller 44 are provided.

  The power source 60 is fixed, for example, near one end of the bed support 46. Based on the load measured by the load sensor 63, the bed control unit 42 controls torque according to the load on the roller 44.

  The first power transmission mechanism 61 includes a clutch 611 that interrupts power from the power source 60, a drive pulley 612 that rotates by the power from the power source 60 that is transmitted via the clutch 611, and the drive pulley 612. The driven pulley 613, which is disposed in the longitudinal direction of the top plate 43 and has the same radius of rotation as the roller 44, is wound around the driving pulley 612 and the driven pulley 613, and engages with the driving pulley 612 to rotate the driving pulley 612. The belt 614 moves in the longitudinal direction of the top plate 43.

  The first power transmission mechanism 61 is supported by the bed support portion 46 so as to be movable in the longitudinal direction of the top plate 43 via a guide rail, for example, and connects a part of the belt 614 and one end portion of the top plate 43. And a coupling body 615 that moves the top plate 43 as the belt 614 moves. And the motive power of the power source 60 is transmitted to the top plate 43, and the top plate 43 is moved and driven in the longitudinal direction. The driven pulley 613 engaged with the belt 614 transmits the power from the power source 60 to the second power transmission mechanism 62.

  The second power transmission mechanism 62 is disposed in the vicinity of the other end portion of the bed support portion 46, and penetrates the rotation center of the driven pulley 613 and the roller 44 that rotate by the rotation of the driven pulley 613 of the first power transmission mechanism 61. The shaft 621 and two bearings 622 that rotatably support the shaft 621 are configured. Then, the power transmitted from the first power transmission mechanism 61 is transmitted to the roller 44 by the rotation of the shaft 621, and the roller 44 rotates in the same direction as the driven pulley 613 at the same speed. Thereby, the roller 44 is rotationally driven at a speed of rolling in the direction of rolling with respect to the top plate 43.

  The load sensor 43 is disposed on the bearing 622 of the second power transmission mechanism 62 and measures a load applied to the roller 44 supporting the top plate 43 on which the subject P is placed. Then, the measured load is output to the bed control unit 42.

  Thus, when the top plate 43 is driven to move in the longitudinal direction by the first power transmission mechanism 61, the roller 44 rotates at a speed that rolls in the direction of rolling with respect to the top plate 43 in accordance with the movement of the top plate 43. It becomes possible to drive, and the frictional resistance due to the starting friction and the movement friction at the contact portion with the roller 44 when the top plate 43 moves can be reduced more than the frictional resistance when the roller 44 is rotatably provided. it can. Further, the power source 60 can be controlled based on the load applied to the roller 44. Thereby, the position accuracy in the position in the time of a movement when the top plate 43 is moved to a longitudinal direction, or the position where it stopped can be improved.

  Further, since the second power transmission mechanism 62 has a simple configuration, it is possible to prevent an increase in the size of a drive system for rotationally driving the roller 44.

  In addition, when the moving mechanism for moving the already operating top plate in the longitudinal direction is configured in the same manner as the first power transmission mechanism 61, the second power transmission mechanism 62 having a simple configuration can be easily provided to the moving mechanism. Can be attached to. Thereby, the position accuracy of the top plate can be improved.

Hereinafter, an example of the operation of the X-ray CT apparatus 100 will be described with reference to FIGS. 1 to 4.
The top plate 43 of the bed 41 in the bed part 40 is the position farthest from the gantry part 11 in the direction of the arrow L2 and stops at the height at which the subject P can easily get on and off as the home position. When imaging of the subject P is performed, after the subject P is placed on the top plate 43, the operator of the X-ray CT apparatus 100 performs an operation of raising the top plate 43 from the operation unit 50. Then, the system control unit 51 instructs the bed control unit 42 to move the top plate 43. Then, the vertical movement drive unit 47 of the bed 41 moves the top plate 43 on which the subject P is placed up to a height at which the subject P can be fed into the opening 12 of the gantry unit 11.

  When an operation for moving the subject P to the imaging position is performed from the operation unit 50 after the top plate 43 is stopped, the load sensor 63 measures the load applied to the roller 44 and outputs it to the bed control unit 42. The couch controller 42 drives and controls the long manual drive unit 45 based on the load measured by the load sensor 63.

  The long manual drive unit 45 drives the top plate 43 to move in the L1 direction and rotationally drives the roller 44 in the R1 direction. Here, when the power source 60 is operated by the control of the bed control unit 42, the driving pulley 612 is rotated in the R1 direction by the power transmitted from the power source 60 via the clutch 611 of the first power transmission mechanism 61. . The belt 614 moves in the L1 direction by the rotational power of the drive pulley 612. Due to the power that the belt 614 moves, the connecting body 615 moves in the L1 direction and the driven pulley 613 rotates in the R1 direction. And the top plate 43 moves to L1 direction with the motive power which the connection body 615 moves. Further, the shaft 621 of the second power transmission mechanism 62 rotates in the R1 direction by the power that the driven pulley 613 rotates, and the roller 44 rotates in the same direction as the driven pulley 613 at the same speed by the power that the shaft 621 rotates.

  Then, the long manual drive unit 45 drives the top plate 43 to move in the L1 direction, sends the subject P into the opening 12, and stops it at a position where the subject P can be imaged. As shown in FIG. 4, the top plate 43 in the vicinity of the stop position protrudes greatly from the bed support portion 46 and is cantilevered in the vicinity of one end portion. Causes a downward deflection. For this reason, the moment applied to the roller 44 increases, and the contact portion with the top plate 43 due to deflection increases.

  Thus, the roller 44 is driven to rotate at a speed that rolls in the direction of rolling with respect to the top plate 43 in accordance with the movement of the top plate 43, thereby increasing the contact portion with the top plate 43 and increasing the load. Since the frictional resistance of 44 can be reduced more than the frictional resistance when the roller 44 is rotatably provided, the accuracy of the stop position of the top plate 43 can be improved.

  Here, when the operator needs to urgently retract the top plate 43 to the position farthest from the gantry 11 by manual operation, the operator operates the clutch 611 to separate the power source 60 and the drive pulley 612. . Next, the belt 614 moves in the L2 direction by the power that moves the connecting body 615 in the L2 direction by the manual operation of pulling or pushing the top plate 43 in the L2 direction, for example. The driven pulley 613 rotates in the R2 direction by the power that the belt 614 moves. The shaft 621 rotates in the R2 direction by the rotating power of the driven pulley 613. The roller 44 rotates in the same direction as the driven pulley 613 at the same speed by the rotating power of the shaft 621.

  As described above, the manual operation of urgently retracting the top plate 43 enables the roller 44 to be rotationally driven at a speed of rolling in the direction of rolling with respect to the top plate 43 in accordance with the movement of the top plate 43. The starting frictional resistance and the kinetic frictional resistance at the contact portion with the roller 44 when the roller moves can be reduced more than the frictional resistance when the roller 44 is rotatably provided. Thereby, the burden of the operator who retracts the top plate 43 by manual operation can be reduced.

  According to the embodiment described above, by providing the long manual drive unit 45, the top plate 43 is driven to move in the longitudinal direction, and the roller 44 is rotated in the direction of rolling with respect to the top plate 43 in accordance with the movement of the top plate 43. It can be rotationally driven at a rolling speed. Thereby, the frictional resistance in a contact part with the roller 44 when the top plate 43 moves can be reduced. Further, the power source 60 can be controlled based on the load applied to the roller 44. As described above, the positional accuracy when the top plate 43 is moved in the longitudinal direction can be improved.

  In addition, the roller 44 can be driven to rotate at a speed of rolling in the direction of rolling with respect to the top plate 43 in accordance with the movement of the top plate 43 by the manual operation of retracting the top plate 43. As a result, it is possible to reduce the frictional resistance at the contact portion with the roller 44 when the top plate 43 moves, compared to the frictional resistance when the roller 44 is rotatably provided, and the top plate 43 can be manually operated. The burden on the operator to be evacuated can be reduced.

  Further, the long manual drive unit 45 is provided with a second power transmission mechanism 62 having a simple configuration for transmitting the power for moving the top plate 43 of the first power transmission mechanism 61 to the roller 44, thereby rotating the roller 44. An increase in the size of the drive system for driving can be prevented.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

P subject 11 gantry part 12 opening 40 bed part 41 bed 42 bed control part 43 top plate 44 roller 45 long manual drive part 46 bed support part 47 vertical movement drive part

Claims (6)

A top plate on which the subject is placed;
A roller disposed under the top plate and supporting the top plate;
A power source for generating power, and a first motion for transmitting the power and moving the top plate in the longitudinal direction.
In accordance with the power transmitted to the force transmission mechanism and the first power transmission mechanism in the moving direction of the top plate
A long manual drive unit comprising a second power transmission mechanism for rotating the roller ;
A bed apparatus comprising a bed support section for supporting the longitudinal drive section. The first power transmission mechanism includes a driving pulley that rotates by power from the power source, a belt that engages with the driving pulley and moves in the longitudinal direction of the top plate by rotation of the driving pulley, and the belt A connecting body that connects a part of the top plate and one end in the longitudinal direction of the top plate and moves the top plate by moving the belt,
The second power transmission mechanism includes a driven pulley that engages with the belt and rotates by the movement of the belt, the driven pulley that rotates by the rotation of the driven pulley, and a shaft that passes through the rotation center of the roller. And a bearing that supports the shaft.
The bed apparatus according to claim 1 . The bed apparatus according to claim 2 , wherein the driven pulley and the roller have the same rotation radius. The drive pulley is disposed near one end of the bed support part,
The roller according to claim 2, characterized in that it is arranged in the vicinity of the other end of the bed supporting part
Or the bed apparatus of Claim 3 . Load sensor for measuring a load applied to the roller, and claims 1 to請 characterized by having a control means for controlling the power source based on the load measured by the load sensor
The bed apparatus according to any one of claims 4 . An image diagnostic apparatus using the bed apparatus according to claim 1 to move the subject toward the imaging apparatus.

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