JP2010099362A - Bed apparatus for radiotherapy apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bed apparatus for a radiotherapy apparatus which can be simlified in structure and reduced in an installation space. <P>SOLUTION: The bed apparatus for the radiotherapy apparatus includes: a top board 4 for placing a patient; a parallel movement device for moving the top board 4 in mutually orthogonal triaxial directions; a rotary movement device 8 for rotating the top board 4; and a bed controller 36 for controlling the parallel movement device and the rotary movement device 8. The rotary movement device 8 includes a plurality of rotary arms 9, 10 for supporting the top board 4. The bed controller 36 allows the longitudinal direction of the rotary arms 9, 10 and the longitudinal direction of the top board 4 to be kept in parallel, and allows the rotary arm 9 to be rotated around an axis in parallel with a z-axis being a vertical direction in a plane in parallel with a floor surface. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a medical particle beam irradiation system, and more particularly to a bed apparatus for a radiation therapy apparatus suitable for a radiation therapy apparatus.

  In recent years, in the cancer treatment by radiation, a particle beam irradiation system that irradiates an affected area of a patient with a charged particle beam such as a proton beam or a carbon beam, which is a particle beam, has attracted attention.

  The particle beam irradiation system includes a charged particle beam generator, a beam transport device, and an irradiation nozzle. The charged particle beam generator accelerates a charged particle beam that circulates along a circular orbit to a desired energy. The charged particle beam accelerated to the target energy is transported to the irradiation nozzle through the beam transport device and emitted from the irradiation nozzle.

  In a particle beam irradiation system, a charged particle beam emitted from an irradiation nozzle is irradiated to a patient lying on a treatment bed installed in a treatment room. A charged particle beam has the physical property of releasing most of the energy (forming a black peak) when the charged particle beam comes to a stop. The position where the black peak is formed in the patient depends on the energy of the charged particle beam. By controlling the energy of the charged particle beam emitted from the irradiation nozzle, the irradiation position of the charged particle beam (irradiation position in the depth direction from the body surface) in the patient can be adjusted. By using the particle beam irradiation system, it is possible to perform a treatment that irradiates a charged particle beam intensively to an affected area while minimizing an influence on a normal tissue of a patient.

  In order to accurately irradiate the affected part as an irradiation target with a charged particle beam, it is necessary to accurately position a radiotherapy bed apparatus (hereinafter referred to as a bed apparatus) on which the patient is placed. Patent document 1 is disclosing the positioning system of the bed apparatus which fixes a patient. The positioning system of Patent Document 1 includes a bed device and a positioning device. As shown in FIGS. 10 and 11, the bed apparatus includes a top plate 4a, a parallel movement mechanism (X-axis drive means, Y-axis drive means, Z-axis drive means), a rotary movement mechanism, and a movable bed. . The particle beam therapy system has a rotating gantry for rotatably arranging an irradiation nozzle around a bed apparatus for fixing a patient. A reference point for beam irradiation called an isocenter is located in front of the irradiation nozzle 20a on the central axis of the rotating gantry. The translation device moves the bed device so that the isocenter 3 is installed at the position of the affected part of the patient. Here, the X-axis drive means is fixed to the bottom surface 37 of the pit dug in the floor of the treatment room, and a belt-like moving floor (access floor) 31 is provided on the top surface of the pit. When the bed apparatus is moved in the X-axis direction using this X-axis driving means, the moving bed 31 of the treatment room is also moved at the same time so that the patient and the operator can easily access.

JP-A-11-313900

  In Patent Document 1, the rotational drive mechanism rotationally drives (isocentric rotation) the bed apparatus in the horizontal plane (in the XY plane). The rotational drive shaft (θ-axis) is an axis parallel to the Z-axis and is located away from the isocenter 3. For this reason, when the bed apparatus is rotated in an isocentric manner, as shown in FIG. 11, it is necessary to control the patient so that the affected area of the patient coincides with the isocenter by further moving the bed apparatus in the X-axis and Y-axis directions. It becomes. For this reason, a stroke range becomes larger than a stroke range required for treatment, and the bed apparatus becomes a large size. Further, in order to prevent the treatment staff from falling into the opening of the floor after movement, it is necessary to appropriately install the moving floor 31 and the like in the floor opening. In addition, since it is rotated around one point of the isocenter 3 at the time of isocentric rotation, it is necessary to drive the X axis and the Y axis in conjunction with the θ rotation, and simultaneously move the three motors in conjunction with each other. In order to have complicated control software.

  An object of the present invention is to provide a radiotherapy bed apparatus having a simple structure.

  The features of the present invention that achieve the above-described object are: a top plate on which a patient is placed; a parallel movement device that moves the top plate in three axial directions orthogonal to each other; and a Z that is up and down in a plane parallel to the floor surface A rotational movement device that rotates the top plate around an axis parallel to the axis, and a bed control device that controls the parallel movement device and the rotational movement device in order to place the top plate at a predetermined position. The bed control device has a plurality of rotating arms that support the top plate, and the bed control device keeps the longitudinal direction of the rotating arms and the longitudinal direction of the top plate in parallel, and the rotating arms are parallel to the Z axis in a plane parallel to the floor surface. Rotate around a special axis.

  According to the present invention, the stroke range of the translation device and the rotation device can be limited to the stroke range necessary for treatment, and the bed device for the radiotherapy device can be miniaturized.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
A particle beam irradiation system which is a preferred embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 1, the particle beam irradiation system 40 of the present embodiment includes a charged particle beam generation device 41, a beam transport device 42, an irradiation nozzle (irradiation device) 20, and a radiotherapy bed device (hereinafter referred to as a bed device) 2. Is provided. A beam transport device 42 connects the charged particle beam generator 41 and the irradiation nozzle 20. The bed apparatus 2 is disposed in the treatment room 52. The bed device 2 includes a bed control device 37. The charged particle beam generator 41 includes an ion source (not shown), a pre-accelerator 43 and a synchrotron 44. A pre-accelerator 43 is connected to the ion source and synchrotron 44. The synchrotron 44 has a high-frequency applying device 45, a quadrupole electromagnet 46, a deflection electromagnet 47, and a high-frequency accelerating cavity 48 serving as a beam accelerator on a circular orbit of the charged particle beam. An exit deflector 50 connects the synchrotron 44 and the beam transport device 42. Ions generated from the ion source (for example, charged particle beams such as proton ions and carbon ions) are emitted to the pre-accelerator 43. The synchrotron 44 receives the charged particle beam accelerated by the pre-accelerator 43 and further accelerates it. This acceleration is performed by applying high frequency power to the high frequency acceleration cavity 48. When the circulating charged particle beam is accelerated to the target beam energy, the excitation currents of the quadrupole electromagnet 46 and the deflection electromagnet 47 are held at the set values. Thereafter, a high frequency power is applied to the output deflector 50, whereby a charged particle beam is emitted from the synchrotron 44.

  The beam transport device 42 includes a beam path 49, a quadrupole electromagnet (not shown), and deflection electromagnets 51 and 22. The irradiation nozzle 20 is installed in the rotating gantry 21 (FIG. 2). The beam path 49 is connected to the irradiation nozzle 20 disposed in the treatment room 52. The rotating gantry 21 has a configuration capable of rotating 360 ° around the bed apparatus 2 that fixes the patient. As the rotary gantry 21 rotates about the rotation axis i (FIG. 3), the irradiation nozzle 20 and the deflection electromagnets 22 and 51 rotate. Since the irradiation nozzle 20 can rotate around the treatment bed apparatus 2, the patient 1 can be irradiated with the charged particle beam from an arbitrary angle. The charged particle beam emitted from the synchrotron 44 reaches the beam transport device 42 via the emission deflector 50. The deflecting electromagnets 51 and 22 change the trajectory of the charged particle beam passing therethrough and transport the charged particle beam along the beam path 49. Thereafter, the charged particle beam reaches the irradiation nozzle 20. The charged particle beam travels along the beam axis m of the irradiation nozzle 20 and is emitted. The charged particle beam emitted from the irradiation nozzle 20 is irradiated to the affected part of the patient 1 fixed to the bed apparatus 2. The irradiation nozzle 20 emits a charged particle beam so as to form an optimal dose distribution according to the affected area of each patient. A configuration in the treatment room 52 including the rotating gantry 21 of the present embodiment will be described. As shown in FIG. 3, the bed apparatus 2 disposed in the treatment room 52 includes a Z-axis drive mechanism 5, a Y-axis drive mechanism 6, an X-axis drive mechanism 7, a θ drive mechanism 8, and a top plate 4. The Z-axis drive mechanism 5, the Y-axis drive mechanism 6, and the X-axis drive mechanism 7 are parallel movement devices, and the θ drive mechanism 8 is a rotational movement device. Here, the Y axis is an axis parallel to the rotation axis i of the rotating body of the rotating gantry 21, as shown in FIG. The X axis is an axis orthogonal to the Y axis. The Z axis is an axis orthogonal to the X axis and the Y axis, and indicates the vertical direction. The X axis, the Y axis, and the Z axis are orthogonal axes. The translation device has a function of moving the top plate 4 in directions of three axes (X axis, Y axis, Z axis) orthogonal to each other. In the drive unit of the bed apparatus 2, a Z-axis drive mechanism 5, a Y-axis drive mechanism 6, an X-axis drive mechanism 7, and a θ drive mechanism 8 are arranged in order from the bottom.

  The Z-axis drive mechanism 5 is a drive mechanism (Z-direction moving device) that can move the bed device 2 (top plate 4) in the vertical direction, which is the direction of gravity. The Z-axis drive mechanism 5 is composed of a linear drive mechanism using a linear guide and a ball screw. The mechanical structure using the linear guide and the ball screw has the same configuration as that of the conventional machine. The stroke (movement amount) is the same as that of the conventional machine.

  The Y-axis drive mechanism 6 is a drive mechanism (Y-direction movement device) that can move the bed device 2 (specifically, the top plate 4) in the gantry cylinder axial direction. The Y-axis drive mechanism 6 is composed of a linear drive mechanism using a linear guide and a ball screw. The mechanical structure using the linear guide and the ball screw has the same configuration as that of the conventional machine. About a stroke, it is the minimum stroke required for a treatment smaller than before. The Y-axis drive mechanism 6 drives the bed apparatus 2 so as to enter and exit the treatment room 52.

  The X-axis drive mechanism 7 is a drive mechanism (X-direction moving device) that can move the bed device 2 (top plate 4) in a direction orthogonal to the Z-axis and the Y-axis. It consists of a linear drive mechanism using a linear guide and a ball screw. The mechanical structure using the linear guide and the ball screw has the same configuration as that of the conventional machine. About a stroke, it is the minimum stroke required for a treatment smaller than before.

The θ drive mechanism 8 is a drive mechanism (rotary moving device) that rotates and moves the bed apparatus 2 (top plate 4) in the XY plane around an axis parallel to the Z axis. The XY plane indicates a plane parallel to the floor surface.
The configuration of the θ drive mechanism 8 will be described with reference to FIGS. 4, 5, and 6. As shown in FIG. 6, the θ drive mechanism 8 includes a base 25, a main rotary arm (first rotary arm) 9, a sub rotary arm (second rotary arm) 10, and a parallel moving body (top plate support member) 17. Have. A base 25 is installed on top of the X-axis drive mechanism 7. Inside the base 25, a bearing portion 11a, a worm gear 12 and a θ-axis drive motor 13 are arranged. A bearing portion 11 a, a worm gear 12, and a θ-axis drive motor 13 are installed at a connection portion between the base 25 and the main rotary arm 9. The θ-axis drive motor 13 is connected to the worm gear 12. The main rotary arm 9 is supported by a support member provided on the base 25, and is fixed to the bearing portion 11a so as to be rotatable in the θ direction. The sub-rotating arm 10 is supported by another support member provided on the base 25. The main rotary arm 9 and the sub rotary arm 10 are supported on the upper surface of the base 25 so as not to interfere with each other when rotated in the θ direction. In the present embodiment, the sub-rotating arm 10 is supported by a recessed portion (concave portion) provided on the upper surface of the base 25, and the bottom surface of the main rotating arm 9 is disposed at a position lower than the upper surface of the sub-rotating arm. The main rotary arm 9 and the sub rotary arm 10 can rotate in the θ direction without interfering with each other. Further, the main rotary arm 9 and the sub rotary arm 10 have the same length in the longitudinal direction.

The parallel moving body 17 is installed on the main rotary arm 9 and the sub rotary arm 10. That is, the main rotary arm 9 and the sub rotary arm 10 support the parallel moving body 17. Inside the parallel moving body 17, bearing portions 11 b and 11 c, sprockets 14 and 15, and a chain 16 are provided. A bearing portion 11 b and a sprocket 14 (second rotation mechanism) are provided at a connecting portion between the parallel moving body 17 and the main rotary arm 9. The top plate 4 is installed on the parallel moving body 17. A bearing portion 11 c and a sprocket 15 (first rotation mechanism) are installed at a connecting portion between the parallel moving body 17 and the top plate 4.
The bearing 11c fixes the top plate 4 on the parallel moving body 17 so as to be rotatable in the θ direction. The sprocket 14 of the main rotary arm 9 and the sprocket 15 of the top plate 4 are connected by a chain 16. The diameter of the sprocket 14 and the diameter of the sprocket 15 of the top plate 4 are the same. The bed control device 37 controls the Z-axis drive mechanism 5, the Y-axis drive mechanism 6, the X-axis drive mechanism 7 and the θ drive mechanism 8 so as to arrange the bed control device 37 at a predetermined position.

  A control procedure of the particle beam therapy system 40 in the present embodiment will be described.

  First, a gantry control device (not shown) rotationally drives the rotating gantry 21 based on angle information (information on the direction in which the charged particle beam is irradiated), which is one of the treatment plan information. The rotating gantry 21 rotates about the rotation axis i and is moved so that the beam path in the irradiation nozzle 20 becomes an angle corresponding to the angle information. When the irradiation nozzle 20 is disposed at a predetermined position, the bed control device 37 moves the bed device 2 to the initial position (the X-axis drive mechanism is the central position, the Y-axis drive mechanism is the retracted position (outward direction of the gantry), and the Z-axis. The drive mechanism is disposed at the lowest position, and the θ drive mechanism is disposed at a position where the longitudinal direction of the main rotary arm is parallel to the gantry axis direction.

  The patient 1 is loaded on the top plate 4 of the bed apparatus 2. A medical worker (for example, a doctor) fixes the patient 1 on the top 4 using a patient fixture. The patient fixture is marked with a mark indicating the approximate position of the affected area. Further, a laser marker (not shown) is provided in the treatment room 52. The laser marker draws a laser line in the X, Y, and Z directions and indicates an isocenter in space.

  The laser marker in the treatment room 52 is turned on, moved up in the Z-axis direction and moved in the X-axis, Y-axis, and θ-direction so that the isocenter position indicated by the laser marker coincides with the mark on the patient fixture. When the bed apparatus 2 is positioned so that the isocenter is positioned at the affected area of the patient 1, the charged particle beam generator 41, the beam transport device 49, and the irradiation nozzle 20 are activated to start emission of the charged particle beam. Is done.

  Here, the positioning control of the bed apparatus 2 of the present embodiment will be described. The bed driving device drives each of the X-axis driving mechanism 7, the Y-axis driving mechanism 6, and the Z-axis driving mechanism 5 so that the position of the isocenter indicated by the laser marker in the treatment room 52 coincides with the mark of the patient fixture. To do.

  The bed apparatus 2 is required to rotate around the isocenter 3 according to the treatment plan. Such an operation method of rotating around the isocenter 3 is referred to as isocentric rotation. Note that this isocentric rotation means rotating around an axis parallel to the Z axis in the XY plane.

  The bed control device 37 outputs a command signal and starts activation of the θ-axis drive motor 13. When the θ-axis drive motor 13 is driven, the worm gear 12 connected thereto rotates, and the sprocket 14 of the main rotary arm 9 rotates. The chain 16 is rotated by the rotation of the sprocket 14. As this rotation proceeds, the positions A and B of the chain 16 shown in FIG. 7A move to the positions A ′ and B ′ shown in FIG. 7B. Since the diameter of the sprocket 14 of the main rotary arm 9 and the diameter of the sprocket 15 of the top plate 4 are the same, the sprocket 15 starts rotating in synchronization with the sprocket 14 when the chain 16 rotates. The sub-rotating arm 10 of this embodiment does not have a rotation drive mechanism such as a motor, but the supporting points of the sub-rotating arm 10 and the base 25 and the supporting points of the sub-rotating arm 10 and the parallel moving body 17 are used as axes. It is installed so that it can rotate. For this reason, the sub-rotation arm 10 has a configuration capable of rotating in the θ direction as the main rotation arm 9 rotates. As the main rotary arm 9 and the sub rotary arm 10 rotate in the θ direction, the parallel moving body 17 moves in parallel in the XY plane. The top plate 4 has a configuration that can rotate in the θ direction as the main rotary arm 9 rotates. As described above, when rotating in the θ direction, the longitudinal axes of the main rotary arm 9, the sub rotary arm 10 and the top plate 4 are always kept parallel as shown in FIG. Since the bed apparatus 2 of this embodiment is mechanically connected in this way, there is no need to install electrical components, wirings, or the like inside the parallel moving body 17 and the top plate 4, and the configuration is simplified. Is done. Further, drive control is simplified.

  The rotation angle of the top plate 4 can be obtained by measuring the rotation angle of the main rotary arm 9 (specifically, the rotation angle of the worm gear 12 or the drive amount of the θ-axis drive motor 13). An angle detector that detects the rotation angle of the worm gear 12 (or a measuring device that measures the drive amount of the θ-axis drive motor 13) is installed, and the bed control device is based on angle information from the angle detector. The bed apparatus 2 (specifically, the top plate 4) is rotated until it reaches a predetermined angle. FIG. 9 is a diagram showing a state of rotation of the bed apparatus 2, and the angles (θ) between the longitudinal axis of the top plate 4 and the Y axis are 0 °, 15 °, 30 °, 45 °, 60 °. , 75 ° and 90 ° are shown in FIG. The position where the axis l and the axis m intersect is the isocenter. When the bed apparatus 2 of the present embodiment is used, the position of the isocenter 3 relative to the top 4 (or the patient 3) does not change even if the top 4 is rotated in the θ direction (FIGS. 8 and 9). . According to the present embodiment, the drive mechanism can be simplified because the X-axis and the Y-axis can be rotated without isocentric rotation. Further, the time required for positioning the bed apparatus 2 is shortened. Thereby, the particle beam therapy system can be efficiently operated.

  On the other hand, in the case of the conventional radiotherapy bed apparatus (bed apparatus) 30, when the isometric rotation (θ-axis rotation), the top plate 4a is moved in the X-axis direction and the Y-axis direction accordingly. Therefore, in order to perform isocentric rotation without changing the position of the isocenter with respect to the top 4 (or the patient 3), as shown in FIG. 11, the X-axis movement amount 32 and the Y-axis movement amount are accompanied by the θ rotation. It is necessary to move to the X and Y axes by 33. Moreover, in the case of the conventional bed apparatus 30, since an opening is made in the floor when the X-axis movement is moved to the stroke end, the opening can be moved laterally together with the X-axis movement so that the treatment staff does not fall. It is necessary to provide a movable floor 31. According to the present embodiment, since the X-axis stroke range 18 and the Y-axis stroke range 19 in the bed apparatus 2 are smaller than the X-axis stroke range 34 and the Y-axis stroke range 35 of the prior art, a moving floor is not required and installed. A device with a small space can be provided. Moreover, according to this embodiment, since the stroke range of the bed apparatus 2 becomes small, the particle beam irradiation system 40 reduced in size can be provided.

  When the top plate 4 is rotated and arranged at a desired angle, the bed control device 37 stops the rotation of the main rotary arm 9. When positioning of the bed apparatus 2 is completed, emission of the charged particle beam is started.

  In the present embodiment, the example in which the bed apparatus 2 is isocentric rotated before starting the charged particle beam emission to the patient 1 has been described. However, isocentric rotation is effective in the case of multi-port irradiation. Multi-port irradiation means that when a charged particle beam is irradiated to an affected area of one patient 1, the irradiated area is irradiated with a beam from a certain direction (first irradiation direction), and after irradiation from the first irradiation direction is completed, This is a method of irradiating a beam from several directions such as irradiating the affected part with a beam from a direction different from the first irradiation direction (second irradiation direction). The bed apparatus 2 operates such that, after the irradiation of the beam from the first irradiation direction is completed, the patient 1 is rotated in an isocentric direction to change the direction of the patient 1 and the charged particle beam is irradiated from the second irradiation direction. .

  In the present embodiment, the synchrotron 44 has been described as an example of the accelerator of the charged particle beam generator 41. However, the present embodiment can also be applied to a cyclotron, a linear accelerator, or the like.

  In the present embodiment, the particle beam therapy system 40 using a charged particle beam has been described as an example, but the present invention can also be applied to a radiation irradiation system such as an X-ray.

  In the present embodiment, the configuration in which the sprocket 14 and the sprocket 15 of the bed apparatus 2 are connected by the chain 16 is shown, but a belt may be used instead of the chain 16.

  In the present embodiment, the drive unit of the bed apparatus 2 has a configuration in which the Z-axis drive mechanism 5, the Y-axis drive mechanism 6, the X-axis drive mechanism 7, and the θ drive mechanism 8 are arranged from the bottom in this order. It is not limited to.

  In the present embodiment, the configuration in which the θ drive mechanism 8 has two rotating arms (the main rotating arm 9 and the sub rotating arm 10) is shown, but three or more rotating arms may be provided.

  In the present embodiment, the particle beam irradiation system 40 having a rotating gantry has been described as an example. However, the bed apparatus 2 of the present embodiment can also be employed in the case of fixed irradiation in which the irradiation nozzle 20 is fixed. For example, when the affected area of a patient is prostate cancer, it is effective because multiple portal irradiation is often performed.

It is a figure showing the whole particle beam therapy system composition which is an embodiment of the present invention. It is a front view which shows the structure in the treatment room containing the rotation gantry of the particle beam therapy apparatus which is embodiment of this invention. It is a side view which shows the structure of the treatment room containing the rotation gantry of the particle beam therapy apparatus which is one Embodiment of this invention. It is a bird's-eye view of the bed apparatus which is one embodiment of the present invention. It is the top view which looked at the bed apparatus which is one Embodiment of this invention from the upper part. It is a block diagram which shows the bed apparatus which is one Embodiment of this invention. It is a figure which shows arrangement | positioning of the bed apparatus at the time of isocentric rotation in one Embodiment of this invention, (a) is an arrangement | positioning drawing when (theta) is 45 degrees, (b) is arrangement | positioning when (theta) is 60 degrees. FIG. It is a figure which shows arrangement | positioning of the bed apparatus at the time of isocentric rotation in one Embodiment of this invention, (a) is an arrangement drawing when (theta) is 0 degree, (b) is an arrangement when (theta) is 45 degrees. FIG. 4C is a layout diagram when θ is 90 °. It is the top view which looked at the bed apparatus which is one Embodiment of this invention from the upper part, (a) is a top view when (theta) is 0 degree, (b) is a top view when (theta) is 15 degrees, (c ) Is a plan view when θ is 30 °, (d) is a plan view when θ is 45 °, (e) is a plan view when θ is 60 °, and (f) is when θ is 75 °. (G) is a plan view when θ is 90 °. It is a front view which shows the structure in the treatment room containing the rotation gantry in the particle beam therapy apparatus of a prior art example. It is a layout view showing a bed apparatus at the time of isocentric rotation of a conventional example, (a) is a layout diagram when θ is 0 °, (b) is a layout diagram when θ is 45 °, (c) is a layout diagram. FIG. 6 is a layout diagram when θ is 90 °.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Patient 2 Radiotherapy bed apparatus 3 Isocenter 4 Top plate 5 Z-axis drive mechanism 6 Y-axis drive mechanism 7 X-axis drive mechanism 8 θ drive mechanism 9 Main rotation arm 10 Sub rotation arm 11 Support bearing 12 Worm gear (worm reduction gear) )
13 θ-axis drive motor 14 Sprocket A
15 Sprocket B
16 Chain 17 Parallel moving body 18 X-axis stroke range 19 Y-axis stroke range 20 Irradiation nozzle 21 Rotating gantry 22 Bending electromagnet 23 Gantry support part 30 Radiation therapy bed device 31 Moving bed 32 X-axis moving amount necessary for isocentric rotation 33 Y-axis travel required for isocentric rotation 34 X-axis stroke range for conventional treatment table 35 Y-axis stroke range for conventional treatment table

Claims (4)

A top plate to put the patient
A translation device for moving the top plate in three axial directions orthogonal to each other;
A rotational movement device for rotating the top plate around an axis parallel to the Z axis which is the vertical direction in a plane parallel to the floor surface;
A bed control device for controlling the parallel movement device and the rotary movement device in order to place the top plate at a predetermined position;
The rotational movement device has a plurality of rotating arms that support the top plate,
The bed control device is characterized in that the longitudinal direction of the rotary arm and the longitudinal direction of the top plate are kept parallel to rotate the rotary arm around an axis parallel to the Z axis in the plane. Radiotherapy bed device. The rotational movement device is
A first rotation arm having rotation driving means and driven to rotate around an axis parallel to the Z axis in the plane by the rotation driving means;
A second rotating arm that rotates when the first rotating arm is driven to rotate;
The first rotating arm, the second rotating arm, and the top plate are rotated while the longitudinal axes of the first rotating arm, the second rotating arm, and the top plate are maintained in parallel. Radiotherapy bed device. A top plate support member supported by the first rotary arm and the second rotary arm and rotatably supporting the top plate;
The first rotation mechanism provided at the connecting portion between the top plate support member and the parallel moving body rotates in conjunction with the second rotation mechanism provided at the connecting portion between the first rotating arm and the parallel moving body. The bed apparatus for a radiotherapy apparatus according to claim 2, wherein the bed apparatus is a radiotherapy apparatus.   The bed apparatus for a radiotherapy apparatus according to claim 3, further comprising a belt or a chain connecting the first rotation mechanism and the second rotation mechanism.

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