JP5546397B2 - Radiation therapy couch top and radiation therapy couch - Google Patents

Description

  The present invention relates to a top plate of a radiotherapy bed used for setting and fixing a patient at a radiation irradiation position in a radiotherapy device used in cancer treatment.

  The radiation therapy bed is used for setting and fixing a patient at a radiation irradiation position during radiation therapy. It is preferable to use a material having a low radiation absorption rate as a material constituting the top plate of the radiation treatment bed and its support mechanism, and in particular, the structure material that is irradiated with radiation and reaches the radiation irradiation position is made of aluminum. We do not use metals with high radiation absorption such as

  In general, there are two types of radiation therapy couches: a side frame method and a center spine method. In the side frame method, frames made of metal with high radiation absorption such as aluminum are not arranged in the center in the short direction of the radiation treatment couch top, but on both sides in the short direction of the radiation treatment couch top. It is a thing. In the center spine method, a frame made of a metal with high radiation absorption rate such as aluminum is not placed on both sides in the short direction of the radiation treatment bed top, but in the center in the short side of the radiation treatment bed top. It is a thing. According to the radiation irradiation position, the type of the radiation treatment bed top plate was selected and used.

  Patent Document 1 discloses a treatment table of a radiation therapy apparatus that can change between a side frame method and a center spine method. This treatment table is provided with two bar-shaped arms in which the top plate is arranged in parallel in the length direction thereof, and is disposed at both ends of the bar-shaped arm, and supports the two bar-shaped arms. Arm moving means for individually translating the bar-shaped arms along the direction is provided, and the width and position of the top plate opening can be changed by changing the positions of the two bar-shaped arms by the arm moving means. Was configured. The arm moving means of the top plate portion is composed of rack and pinion mechanisms provided at both ends of the rod-like arm.

JP 2000-354638 A (0032 to 0034 stages, FIGS. 8 and 9)

  Although the treatment table of the radiotherapy apparatus described in Patent Document 1 is configured so that the center spine method and the side frame method can be selectively used by moving two rod-shaped arms, the structure of the top plate portion Becomes very complicated, and the connecting part between the movable bar arm and the fixed side of the treatment table is rattled, and the position of the bar arm is displaced depending on the patient's position, the operating angle of the treatment table, etc. There was a risk of displacement of the irradiated part.

  The present invention has been made in order to solve the above-described problems, and has a simple structure that eliminates the movable part that mutually changes between the side frame method and the center spine method. An object of the present invention is to obtain a radiotherapy couch top that suppresses the above.

A fixing plate installed on the radiation therapy bed and a separation plate detachably coupled to the fixing plate are provided. The separation plate can be attached to and detached from the separation plate frame, the separation plate frame having a fixed plate connection portion coupled to the fixation plate so that the front and back sides of the separation plate can be changed, and a rod-shaped arm extending from the fixation plate connection portion in the longitudinal direction of the separation plate. There are a plurality of divided side plates to be connected, and the bar-shaped arm has a center line in the longitudinal direction of the separating plate such that the distances from the center line in the longitudinal direction of the bar-shaped arm to the left and right ends of the separating plate are different. It was arrange | positioned in the position away from the transversal direction of this separation plate.

A top plate for a radiotherapy bed according to the present invention includes a fixed plate installed on the radiotherapy bed and a separation plate detachably coupled to the fixed plate, and the bar-shaped arm of the separation plate is in the longitudinal direction of the bar-shaped arm. Since the distance from the center line in the separation plate to the left and right ends of the separation plate is different from the center line along the longitudinal direction of the separation plate, The position of the bar-shaped arm can be changed by changing the front and back of the separation plate frame, and it has a simple structure that eliminates the movable part that changes between the side frame method and the center spine method, and suppresses the displacement of this movable part. be able to.

It is a figure which shows the radiation treatment bed by Embodiment 1 of this invention. It is a figure which shows the division | segmentation structure of the division | segmentation type top plate of FIG. It is AA sectional drawing of FIG. It is a figure which shows the division | segmentation side plate of FIG. It is a figure which shows the division | segmentation side plate of FIG. It is a figure explaining irradiation using the radiotherapy bed of the present invention. It is a figure which shows the radiotherapy bed by Embodiment 2 of this invention. It is a figure which shows the division | segmentation structure of the division | segmentation type top plate of FIG. It is a figure which shows the plate by Embodiment 3 of this invention.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a radiation therapy bed according to Embodiment 1 of the present invention. FIG. 1A is a view of the radiation therapy bed 20 as viewed from above, and FIG. 1B is a view of the radiation therapy bed 20 as viewed from the side. FIG. 2 is a diagram showing a division structure of the division type top plate. The radiation therapy bed 20 includes a split-type top plate 15 (hereinafter simply referred to as a top plate) on which the patient 12 is placed and fixed, and the top plate 15 in each of the X-axis direction, the Y-axis direction, and the Z-axis direction. And a driving device 11 that rotates in the θ direction around the X axis, the φ direction around the Y axis, and the ξ direction around the Z axis. The drive device 11 moves the position of the top plate 15. The top plate 15 has a fixed plate 6 fixed to the driving device 11 and a separation plate 9 separated from the fixed plate 6. The separation plate 9 is coupled to the fixed plate 6 so that the front and back sides can be changed. The separation plate 9 includes a separation plate frame 5 and a plurality of division plates that can be attached to and detached from the separation plate frame 5. In FIG.1 and FIG.2, the case where there are four divided end plates 1, divided side plates 2, divided side plates 3, and divided side plates 4 as a plurality of divided plates is shown. The separation plate frame 5 includes a rod-shaped arm 51, a fixed plate connection portion 52, and a divided end plate connection portion 53. The fixing plate connecting portion 52 is provided with a coupling protrusion 19 that is coupled to the coupling groove 18 of the fixing plate 6, and the separation plate 9 is coupled to the coupling groove 18 with a fixing component such as a bolt or a nut. It is fixed to the fixed plate 6. Here, each of the separation plate frame 5, the divided end plate 1, the divided side plate 2, the divided side plate 3, and the divided side plate 4 is 20 kg or less.

  FIG. 3 is a cross-sectional view taken along the line AA of FIG. The separating plate frame 5 of the separating plate 9 extends from the fixed plate connecting portion 52 in the longitudinal direction of the separating plate 9, passes through the center line 13 in the longitudinal direction of the top plate 15 and the center line 13 in the vertical direction of the top plate 15. They are offset from the center line 14 in the left-right direction, which is the short direction of the top plate 15. That is, the separation plate frame 5 is arranged at a position away from the center line 13 in the short direction. The rod-like arm 51 of the separation plate frame 5 is provided with four engagement grooves 7 on both sides of the top plate 15 in the vertical direction. The engagement groove 7 is formed by extending in the longitudinal direction of the separation plate 9 on the front surface 51 a located on the front surface side of the separation plate 9 and the back surface 51 d located on the rear surface side of the separation plate 9.

The engagement groove 7 engages with an engagement protrusion 21 of the divided side plate 2, an engagement protrusion 31 of the divided side plate 3, and an engagement protrusion 41 of the divided side plate 4 described later. The engagement grooves 7 formed on the front surface 51a and the engagement grooves 7 formed on the back surface 51d are arranged so that their positions when projected onto a plane parallel to the separation plate 9 are coincident with each other. The divided side plates 2, 3, and 4 are connected in contact with the respective connecting portions 23, 33, and 34 and both corners of the bar-shaped arm 51 (see FIGS. 4 and 5). 3, the two sides of the corner portions of the rod-like arm 51, a front surface and a side surface.

  FIG. 4 is a view showing the divided side plate 2, and FIG. 5 is a view showing the divided side plate 3. The divided side plate 2 includes a plate 2a, a seat 2b, and a divided side plate frame 2c. The split side plate 2 can be separated from the plate 2a. The divided side plate frame 2c has a U-shape that forms the opening 2d, and a plate support portion 22 that supports the plate 2a is provided around the opening 2d. Further, the divided side plate frame 2c has a connection portion 23 connected to the rod-shaped arm 51 of the separation plate frame 5 on the side where the plate 2a is inserted, and this connection portion 23 is connected to the rod-shaped arm 51 of the separation plate frame 5. Engaging protrusions 21 to be engaged are provided. The sheet 2b covers the opening 2d.

  The divided side plate 3 has the same structure as the divided side plate 2. The divided side plate 3 includes a plate 3a, a sheet 3b, and a divided side plate frame 3c. The divided side plate 3 can be separated from the plate 3a. The divided side plate frame 3c has a U-shape that forms an opening 3d, and a plate support 32 that supports the plate 3a is provided around the opening 3d. Further, the divided side plate frame 3c has a connection portion 33 connected to the rod-shaped arm 51 of the separation plate frame 5 on the side where the plate 3a is inserted, and this connection portion 33 is connected to the rod-shaped arm 51 of the separation plate frame 5. An engaging protrusion 31 is provided for engaging. The sheet 3b covers the opening 3d.

  The divided side plate 4 has a connecting portion 43 connected to the rod-shaped arm 51 of the separating plate frame 5 on the side located inside the integrated separating plate 9, and the connecting portion 43 has a rod-shaped arm of the separating plate frame 5. An engagement protrusion 41 that engages with 51 is provided.

The divided end plate 1 includes a divided end plate frame 1c having an opening 1d formed therein and a sheet 1b. Opening 1d of the split end plate 1, when the head of the patient 12 is positioned, sized to split end plate frame 1c does not block the particle beam when irradiating a particle beam from below the split end plate 1 I am doing it. The sheet 1b covers the opening 1d. The divided end plate 1 has an engagement hole that engages with the positioning protrusion 17 provided in the divided end plate connecting portion 53 of the separation plate frame 5. The divided end plate 1 is engaged with the positioning protrusion 17 of the divided end plate connecting portion 53 in the engagement hole, and is fixed to the divided end plate connecting portion 53 with a fixing component such as a bolt or a nut.

  The frame of the separation plate 9 is made of a metal such as aluminum as in the conventional case. A metal such as aluminum has a high radiation absorption rate, but is lightweight, has high workability, and has been conventionally used for a frame of a bed for a radiation therapy apparatus. In the separation plate 9 of the first embodiment, a metal such as aluminum is used for the divided end plate frame 1c, the divided side plate frame 2c, the divided side plate frame 3c, the divided side plate 4, and the separating plate frame 5.

A connecting portion between the divided side plates 2, 3, 4 and the bar-shaped arm 51 of the separation plate frame 5 will be described in detail with reference to FIG. 3. Split side plate 2, the engaging projection 21 engages with the engaging groove 7 of the rod-like arm 51 (upper left side in FIG. 3), the connecting portion 23 is brought into contact with the front surface 51a and the left side surface 51b of the rod-like arm 51 It is detachably connected so that there is no rattling. Dividing plate 4, the engaging projection 41 is engaged with the engaging groove 7 of the rod-like arm 51 (upper right side in FIG. 3), the connecting portion 43 comes into contact with the front surface 51a and the right side surface 51c of the rod-like arm 51 It is detachably connected so that there is no rattling. Dividing plate 3, similar to the split side plates 2, the engaging projection 31 is engaged with the engaging groove 7 of the rod-like arm 51 (upper left side in FIG. 3), the connecting portion 33 and the front surface 51a of the rod-like arm 51 It contacts the left side surface 51b and is detachably connected so as not to rattle.

  The length in the longitudinal direction of the separating plate 9 in the divided side plate 4 is slightly shorter than the length between the divided end plate connecting portion 53 and the fixed plate connecting portion 52, and the divided side plate 4 is attached to the separating plate frame 5. It is easy to attach and detach when removing and removing. In the divided side plates 2 and 3, the total length in the longitudinal direction of the separating plate 9 in the divided side plates 2 and 3 is slightly shorter than the length between the divided end plate connecting portion 53 and the fixed plate connecting portion 52. When the divided side plates 2 and 3 are attached to or detached from the separation plate frame 5, they can be easily attached and detached. The divided side plates 2 and 3 and the divided side plate 4 have some allowance between the divided end plate connecting portion 53 and the fixed plate connecting portion 52 in the length direction of the separating plate 9, but the patient 12 has a ceiling. When placed on the plate 15 and fixed, it does not rattle due to the weight of the patient 12.

Next, irradiation using the radiation therapy bed 20 of Embodiment 1 will be described. FIG. 6 is a diagram for explaining irradiation using the radiation treatment bed of the present invention. An example using charged particle beams such as proton beams and heavy particle beams as radiation will be described. The patient 12 fixed to the top 15 is irradiated with the particle beam 62 by the particle beam therapy apparatus 60. Direction is irradiated from the irradiation nozzle 61 of the particle beam 6 2 of a particle beam therapy system 60, the position of the affected part is irradiated target patient 12, an appropriate direction is selected. For example, the irradiation nozzle 61 of the particle beam therapy system 60 is installed in the rotating gantry and can irradiate from any direction of 360 degrees around the patient 12. In FIG. 6, three directions are illustrated. The particle beam 62A is irradiated from right above the patient 12, the particle beam 62B is irradiated from obliquely below the patient 12, and the particle beam 62C is irradiated from directly below the patient 12. It is. The particle beam 62 </ b> A is irradiated from an irradiation nozzle 61 </ b> A of the particle beam therapy apparatus 60 </ b> A disposed immediately above the patient 12. Similarly particle beam 6 2B is irradiated from the irradiation nozzles 61B of the disposed obliquely below the patient 12 a particle beam therapy system 60B, a particle beam 6 2C, the irradiation of the disposed beneath the patient 12 a particle beam therapy system 60C Irradiated from nozzle 61C.

  The top plate 15 of the first embodiment has a structure in which the divided end plate 1 is fixed to the separating plate frame 5 and the divided side plates 2, 3, 4 can be connected as described above. When the radiation irradiation position of the patient 12 is at the position of the divided side plate 3 and the radiation is irradiated from obliquely below the patient 12, the radiation is irradiated from obliquely below the patient 12 after the plate 3a is removed. At this time, since the sheet 3b is affixed to the divided side plate frame 3c, when the plate 3a is removed, the patient 12 can be prevented from sinking into the central portion of the divided side plate frame 3c. The same applies to the case where the radiation irradiation position of the patient 12 is at the position of the divided side plate 2 and the radiation is irradiated obliquely from below the patient 12. Here, the sheet 2b and the sheet 3b are made of a material having a low radiation absorption rate such as a polyester film. By using a material having a low radiation absorption rate, the radiation range is hardly affected. Therefore, even if radiation passes through the sheet 2b and the sheet 3b, the radiation absorption by the sheet 2b and the sheet 3b has no problem, and radiotherapy can be performed. The sheet 1b is also made of a material having a low radiation absorption rate such as a polyester film.

In the top plate 15 of the first embodiment, the bar-shaped arm 51 of the separation plate frame 5 passes through the center line 13 in the longitudinal direction of the top plate 15 and the center line 14 in the vertical direction of the top plate 15 in the left-right direction. They are offset. By arranging the bar-shaped arm 51 offset from the center line 13 in the left-right direction, it is possible to irradiate from directly below the top plate, which is impossible with the conventional center spine top plate. However, as shown in FIG. 3, in order to ensure the rigidity of the separation plate frame 5, it is difficult to offset the rod-shaped arm 51 to the left or right. It may be difficult to accurately irradiate a wide irradiation range from directly below the center line 13 of the top plate. However, the patient 12 can be moved by slightly moving the irradiation position of the patient 12 from the center line 13 in the longitudinal direction of the top plate so that the bar-shaped arm 51 is not located in the irradiation range of the particle beam 62. Specifically, by slightly moving the patient 12, by the drive unit 11 to the positional deviation radiation jig 療寝 base 20 is provided from the isocenter by the movement, by a method such as using a lateral direction drive, adjusting I can do it. Therefore, the top plate 15 of the first embodiment can cover a wider range of the irradiation direction of the particle beam 62 than the conventional center spine top plate.

  Next, consider the case where the radiation irradiation position of the patient 12 is at the position of the divided side plate 4 and the radiation is irradiated from obliquely below the patient 12. 1, the separation plate frame 5 is installed on the fixed plate 6 upside down, the divided end plate 1 is turned upside down, and the arrangement of the divided side plates 2 and 3 and the divided side plate 4 is switched. That is, the position of the bar-shaped arm 51 of the separation plate frame 5 is reversed in the left and right directions in FIG. 1, the divided side plate 4 is arranged on the divided side plates 2 and 3 side in FIG. 1, and the divided side plates 2 and 3 are divided in FIG. Arranged on the side plate 4 side.

  As shown in FIG. 2, the top plate 15 of the first embodiment has a simple structure, and the divided end plates 1 and the divided side plates 2 to 4 can be easily detached from the separating plate frame 5. Since the separation plate frame 5, the divided end plate 1, the divided side plate 2, the divided side plate 3, and the divided side plate 4 are each 20 kg or less, the front and back of the separation plate frame 5 can be replaced manually without any problem. In addition, it can be replaced with another separation plate provided with a connection interface between the fixed plate 6 and the separation plate 9, that is, the coupling protrusion 19 of the separation plate 9 coupled to the coupling groove 18 of the stationary plate 6. Further, the separation plate 9 can be used by being coupled to the radiation therapy bed 20 installed at a different place. By unifying the connection interface between the fixed plate 6 and the separation plate 9, the separation plate 9 can be used with a plurality of radiation treatment beds 20. By in-service, there is no need to store spare members for each radiation treatment bed 20, and maintenance of the top plate 15 can be performed without hindering the use of the radiation treatment bed 20, thereby increasing flexibility and convenience. it can.

  Examples of other separation plates include a separation plate having a short top plate in the longitudinal direction, a separation plate in which the frame of the separation plate 9 or the like is made of carbon fiber for a person with a short height. If the frame of the separating plate 9 is made of carbon fiber, the weight can be further reduced. Since carbon fiber absorbs less radiation than aluminum, the patient 12 is irradiated with radiation so as to pass through the rod-shaped arm 51. Can do.

  Note that the sheets 1b, 2b, and 3b of the divided end plate 1 and the divided side plates 2 and 3 have been described as covering almost all of the openings 2d and 3d. You may apply what covers only. In this case, the irradiation nozzle 61 of the particle beam therapy system 60 can be brought close to the patient 12 to near the boundary of the sheet. In addition, when a part of the sheet 1b of the divided end plate 1 has an opening, the patient 12 can easily breathe even if the patient 12 becomes prone. Therefore, variations in the posture of the patient 12, the position of the irradiation nozzle 61, and the dose in radiation therapy can be varied.

  Further, the engagement groove 7 formed on the front surface 51a and the engagement groove 7 formed on the back surface 51d will be described with an example in which the positions when projected onto a plane parallel to the separation plate 9 coincide with each other. However, it may be substantially the same. When the separation plate 9 is changed between the front and back sides, the divided side plates 2, 3, and 4 do not have to be extremely protruded or dented from the end of the separation plate 9.

As described above, the radiation treatment bed top plate 15 according to the first embodiment includes the fixed plate 6 installed on the radiation treatment bed 20 and the separation plate 9 detachably coupled to the fixed plate 6 . The separation plate 9 includes a separation plate frame 5 having a fixed plate connection portion 52 that is coupled to the fixation plate 6 so that the front and back sides of the separation plate 9 can be changed, and a rod-shaped arm 51 that extends from the fixation plate connection portion 52 in the longitudinal direction of the separation plate 9; A plurality of divided side plates 2, 3, 4 are detachably connected to the separation plate frame 5, and the bar-shaped arm 51 is separated from the center line 13 in the longitudinal direction of the separation plate 9 in the short direction of the separation plate 9. The position of the bar-shaped arm can be changed by changing the front and back of the separation plate frame, and this structure has a simple structure that eliminates the movable part that changes between the side frame method and the center spine method. Suppressing displacement of moving parts Can.

As described above, according to the radiation treatment bed 20 of the first embodiment, the radiation treatment bed top 15 on which the patient 12 is placed and the drive device 11 that moves the position of the radiation treatment bed top 15 are provided. , radiotherapy couch for the top plate 15, and the fixing plate 6 installed in the radiotherapy couch 20, detachably provided coupled to the separating plate 9 to the fixed plate 6, the separation plate 9, the front and back to the fixed plate 6 A separation plate frame 5 having a fixed plate connection portion 52 that is variably coupled, and a bar-shaped arm 51 that extends from the fixation plate connection portion 52 in the longitudinal direction of the separation plate 9, and is detachably connected to the separation plate frame 5. A plurality of divided side plates 2, 3, and 4, and the rod-shaped arm 51 is disposed at a position away from the center line 13 in the longitudinal direction of the separation plate 9 in the short direction of the separation plate 9. The couch top is side frame and center With a simple structure that eliminates the movable part that changes between the spine method, the positional deviation of this movable part can be suppressed, the deviation of the radiation irradiation part in radiation therapy can be suppressed, and radiation treatment Can be performed with high accuracy.

Embodiment 2. FIG.
FIG. 7 is a view showing a radiation treatment bed according to the second embodiment of the present invention, and FIG. 8 is a view showing a divided structure of the split top plate according to the second embodiment. The radiation treatment bed 50 of the second embodiment is different from the first embodiment in that the front and back of the separation plate 10 can be exchanged by rotating the separation plate 10 without completely removing it from the fixed plate 8. The radiation treatment bed 50 includes a split-type top plate 16 (hereinafter simply referred to as a top plate) on which the patient 12 is placed and fixed, and the top plate 16 in each of the X-axis direction, the Y-axis direction, and the Z-axis direction. And a driving device 11 that rotates in the θ direction around the X axis, the φ direction around the Y axis, and the ξ direction around the Z axis. The top plate 16 includes a fixed plate 8 fixed to the driving device 11 and a separation plate 10 that can be separated from the fixed plate 8.

  The separation plate 10 is obtained by replacing the separation plate frame 5 of the separation plate 9 of the first embodiment with a separation plate frame 35. The separation plate frame 35 is obtained by replacing the fixed plate connection portion 52 of the separation plate frame 5 with the fixed plate connection portion 54. The fixing plate 8 has an engaging column 26 connected to the fixing plate connecting portion 54 of the separation plate frame 35. The engagement column 26 has a cylindrical shape, and the central axis thereof is located on the center line 13 in the longitudinal direction of the top plate 16 when the top plate 16 is viewed from above. A positioning protrusion 27 that determines the front and back positions of the separation plate 10 is provided at the tip of the engagement column 26. The positioning protrusion 27 has, for example, a quadrangular prism shape, and the central axis of the positioning protrusion 27 coincides with the central axis of the engagement pillar 26. The fixing plate connecting portion 54 of the separation plate 10 has an engaging hole 28 that engages with the engaging column 26 of the fixing plate 8, and a positioning hole that engages with the positioning protrusion 27 at the tip of the engaging hole 28. 29 is provided. The fixing plate connecting portion 54 of the separation plate 10 is provided with a fixing portion 55 that is fixed to the fixing plate 8. The fixing portion 55 is fixed to the fixing plate 8 using fixing parts such as bolts and nuts.

  A method for replacing the front and back of the separation plate 10 will be described. The fixing component is removed from the fixing plate connecting portion 54 of the separating plate 10 so that the separating plate 10 can be rotated from the fixing plate 8. The division side plates 2 to 4 are removed from the separation plate frame 35, and the engagement between the positioning protrusions 27 and the positioning holes 29 is released in a direction away from the fixing plate 8 in the central axis direction of the engagement column 26. Move to. The separation plate frame 35 is rotated so that the front and back sides thereof are interchanged. The separating plate frame 35 is moved in the direction approaching the fixed plate 8 in the central axis direction of the engaging column 26 so that the positioning protrusion 27 and the positioning hole 29 are engaged. The fixing plate connecting portion 54 of the separation plate 10 is provided with a fixing portion 55 that is fixed to the fixing plate 8. The fixing portion 55 is fixed to the fixing plate 8 using fixing parts such as bolts and nuts.

  After changing the front and back of the separation plate frame 35, as described in the first embodiment, the divided end plate 1 is turned upside down, and the arrangement of the divided side plates 2 and 3 and the divided side plate 4 is switched.

  The top plate 16 of the second embodiment can change the front and back of the separation plate 10 without completely separating the separation plate 10 from the fixed plate 8. Since the separation plate 10 is not completely separated from the fixed plate 8, it can be easily changed with a smaller force than in the first embodiment. The radiation therapy bed 50 of the second embodiment can easily change the separation plate 10 of the top plate 16 with a smaller force than that of the first embodiment. Therefore, the front and back of the separation plate 10 can be changed in a shorter time than in the first embodiment. As a result, the radiation therapy bed 50 can be brought into a predetermined state for each patient 12 in a short time, and the total time required for radiation therapy can be shortened.

  In addition, although the center axis | shaft of the engagement pillar 26 demonstrated in the example located on the center line 13 in the longitudinal direction of the top plate 16 at the time of seeing the top plate 16 from the top, the case where it corresponds substantially may be sufficient. When the separation plate 9 is changed between the front and back sides, the divided side plates 2, 3, and 4 do not have to be extremely protruded or dented from the end of the separation plate 9.

Embodiment 3 FIG.
FIG. 9 is a diagram showing a plate of the divided side plate according to the third embodiment of the present invention. FIG. 9A shows an example in which a metal sphere 24 is embedded in or on the surface of the plate 2a (3a) of the divided side plate 2 (3). FIG. 9B is an example in which the metal plate 25 is embedded or stuck inside or on the surface of the plate 2a (3a) of the divided side plate 2 (3). The metal sphere 24 and the metal plate 25 constitute an X-ray attenuation unit that attenuates X-rays. As shown in FIG. 9, since the X-ray attenuation part of the metal ball 24 and the metal plate 25 is provided on the plate 2a (3a) of the divided side plate 2 (3), the radiation when the patient 12 is fixed to the radiation treatment bed. Even when the irradiation position plate 2a (3a) is forgotten to be extracted, the metal sphere 24 and the metal plate 25 are reflected in the X-ray image when the irradiation position is confirmed by X-ray imaging that is normally performed in radiation therapy. It is possible to confirm that (3a) is forgotten. Therefore, it is possible to prevent forgetting to remove the plate 2a (3a) of the divided side plate 2 (3) during radiation therapy.

  The plate of the divided side plate according to the third embodiment can be applied to both the radiation treatment bed 20 of the first embodiment and the radiation treatment bed 50 of the second embodiment.

  In addition to the metal sphere 24 and the metal plate 25, the same effect can be obtained by embedding or pasting the plate 2 a (3 a) using a material that greatly differs from the plate 2 a (3 a) and the human body. can get.

  In Embodiments 1 to 3, the division structure of the division plate to be attached to the separation plate frame 5 (35) has been described with four cases. However, the division arrangement may be other cases, and the number of divisions may be reduced or increased. You may do it.

  Further, the rod-shaped arm 51 has been described as an example of a quadrangular column parallel to the front and back surfaces of the separation plate 9, but other shapes such as a quadrangular column that is not parallel to the front and back surfaces of the separation plate 9, a cylinder, and an elliptic column. It does not matter. The engaging groove 7 formed on the front surface 51a and the engaging groove 7 formed on the back surface 51d are arranged so that their positions when projected onto a plane parallel to the separating plate 9 are coincident with each other. 9 (10) when the front and back sides are changed, that is, when the front and back sides of the rod-shaped arm 51 are changed, the connecting portions 23, 33, and 43 of the divided side plates 2 to 4 can be connected to the front and back surfaces exactly. it can.

2,3,4 ... split side plates, 2a, 3 a ... plate, 2b, 3 b ... sheet, 2c, 3 c ... divided side frames, 2d, 3 d ... opening, 5 and 35 ... separation plate frame, 6, DESCRIPTION OF SYMBOLS 8 ... Fixed plate, 7 ... Engagement groove, 9, 10 ... Separation plate, 11 ... Drive apparatus, 12 ... Patient, 13 ... Center line, 15, 16 ... Top plate, 20, 50 ... Radiation treatment bed, 21, 31 , 41 ... engaging projection, 23, 33, 43 ... connecting portion, 24 ... metal balls, 25 ... metal plate, 26 ... engaging post, 28 ... engaging hole, 51 ... rod-like arm, 51a ... front surface, 51d ... back face, 52, 54 ... fixing plate connection.

Claims (9)

A top plate for a radiation therapy bed used for a radiation therapy bed for placing a patient during radiation therapy and setting the patient to a radiation irradiation position,
A fixed plate installed on the radiation treatment bed, and a separation plate detachably coupled to the fixed plate,
The separation plate is
A separation plate frame having a fixed plate connection portion coupled to the fixed plate so as to be front and back changeable, and a rod-like arm extending from the fixed plate connection portion in the longitudinal direction of the separation plate;
A plurality of split side plates detachably connected to the separation plate frame;
The bar-shaped arm has a lateral direction from the center line in the longitudinal direction of the separation plate so that distances from the center line in the longitudinal direction of the bar-shaped arm to the left and right ends of the separation plate are different from each other. A top plate for a radiation therapy bed, which is arranged at a position separated from each other. The fixed plate has an engagement column connected to the fixed plate connecting portion of the separation plate,
The separation plate has an engagement hole that engages with the engagement column in the fixed plate connection portion,
2. The engaging column according to claim 1, wherein the engaging column is disposed so that a center axis thereof is substantially coincident with a center line in a longitudinal direction of the fixing plate when the fixing plate is viewed from above. Radiation therapy couch top. The bar-shaped arm has engagement grooves formed on the front surface of the separation plate and the rear surface of the separation plate on the rear surface side, extending in the longitudinal direction of the separation plate,
The engagement grooves formed on the front surface and the engagement grooves formed on the back surface are arranged so that the positions when projected onto a plane parallel to the separation plate are substantially coincided with each other,
The divided side plate has a connection portion connected to the rod-shaped arm,
The top plate for a radiotherapy bed according to claim 1 or 2, wherein an engagement protrusion that engages with the engagement groove is provided in the connection portion.   The top plate for a radiotherapy bed according to claim 3, wherein the bar-shaped arm has two parallel engaging grooves on each of the front surface and the back surface.   The at least one of the divided side plates includes a divided side plate frame in which an opening is formed, a sheet that covers the opening, and a plate that is detachably installed in the opening. The top plate for a radiation therapy bed according to any one of 4.   The top plate for a radiotherapy bed according to claim 5, wherein the plate has an X-ray attenuation unit that attenuates X-rays.   The top plate for a radiotherapy bed according to claim 5 or 6, wherein the sheet covers a portion of the opening that is connected to the rod-shaped arm of the divided side plate. The top plate for a radiotherapy bed according to any one of claims 5 to 7, wherein the material of the sheet is a material having a radiation absorption rate lower than that of aluminum . A radiotherapy bed that places a patient during radiotherapy and sets the patient to a radiation irradiation position,
A radiotherapy couch for placing the patient;
A drive device for moving the position of the radiation therapy couch top;
The radiation treatment bed according to any one of claims 1 to 8, wherein the radiation treatment bed top plate is a radiation treatment bed top plate.

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