Fixture for radiation treatment

Abstract

Provided is a fixture for radiation treatment to be used with a patient in the supine irradiation position, the fixture for radiation treatment comprising: a back support part that can be placed between a top plate mounted on a bed provided in a radiation treatment system and the back of the patient; and a leg part that can be fixed to the top plate. The back support part is provided with a raised part in the center.

Description

Radiotherapy fixture CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This international application claims priority based on Japanese Patent Application No. 2024-066423, filed with the Japan Patent Office on March 31, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a fixation device for radiotherapy.

[0003] Radiation therapy is a treatment in which radiation is directed at a patient's tumor.

[0004] Radiation therapy generally involves the following process: (1) The patient's irradiation position is determined, an immobilization device is prepared to hold the patient in that irradiation position, and then a simulation is performed using a simulation device such as a CT simulator with the immobilization device in place. Next, (2) a treatment plan is created on a computer called a treatment planning system, and verification is performed. Finally, (3) the desired irradiation position is taken using the immobilization device prepared in (1), and accurate setup and position matching is performed using body surface markers, a laser sight, a light field, an image matching device, etc., before radiation is delivered.

[0005] As such, the main role in maintaining the irradiation position during radiation therapy is played by immobilization devices, which play an important role in increasing the reproducibility of the irradiation position. Because a series of radiation treatments requires multiple irradiations, reproducibility of the irradiation position is important so that radiation can be irradiated in the same way to the same area each time.

[0006] In radiation therapy, there are conventionally used irradiation positions and immobilization devices depending on the type of cancer and the area to be irradiated. For example, in head and neck cancer, a planar thermoplastic shell is used to cover the body surface from the head to the neck. In addition, when performing stereotactic body irradiation for lung cancer, liver cancer, etc., an immobilization device is used to hold the patient in a supine position with both arms elevated.

[0007] For breast cancer, radiation therapy is primarily performed in the supine position with both arms elevated, or prone position with both arms elevated and the breast hanging down, and there are immobilization devices suitable for each position.

[0008] Patent Document 1 discloses a radiation therapy fixation device for use in a supine position, which fixes both upper limbs in an elevated position. To facilitate fixation of the patient's position, the device includes a left arm rest and a right arm rest, on which the lifted upper limbs are placed, and a left hand grip bar and a right hand grip bar located between the arm rests, which are arranged symmetrically. The patient lifts their upper limbs and holds the grip bars to maintain the elevated position.

[0009] Patent No. 5770592

[0010] However, when using a radiotherapy immobilization device such as that described in Patent Document 1, depending on the comorbidities and conditions of each individual patient, it may be difficult to use a conventional irradiation position or immobilization device, and the accuracy of patient immobilization may actually be reduced. For example, a patient may be unable to fully elevate their upper limbs due to various comorbidities such as shoulder joint disease or fractures. In such cases, if radiotherapy is performed using a conventional radiotherapy immobilization device, the upper limbs may interfere with the radiation field, making it difficult to perform radiotherapy.

[0011] An object of the present invention is to provide a technique for solving the above-mentioned problems.

[0012] In order to achieve the above-mentioned object, the radiotherapy fixation device of the present invention is a radiotherapy fixation device used when the patient is in a supine irradiation position, and comprises a back support part that can be placed between the patient's back and a tabletop placed on a bed provided in a radiotherapy system, and legs that can be fixed to the tabletop, and the back support part has a raised part in the center.

[0013] According to the present invention, when the patient's back is placed on the raised portion, the patient's chest is opened on the back support portion. As a result, even if the patient is unable to lift their upper limbs, radiation can be irradiated to the irradiation site in an appropriate irradiation position by extending the shoulder joints dorsally.

[0014] FIG. 4 is a diagram showing the configuration of a radiotherapy fixing device of the present invention. FIG. 5 is a diagram (front view) showing a back support section according to the first embodiment. FIG. 6 is a diagram (side view) showing a back support section according to the first embodiment. FIG. 7 is a diagram (perspective view) showing another example of a back support section according to the first embodiment. FIG. 8 is a diagram showing a patient placed in a supine position on the back support section shown in FIG. 4. FIG. 9 is a diagram (perspective view) showing an example of a lower limb support section according to the first embodiment. FIG. 10 is a diagram showing the configuration of a radiotherapy fixing device according to a second embodiment. FIG. 11 is a diagram showing the configuration of a radiotherapy fixing device according to a third embodiment. FIG. 12 is a diagram showing an example of a lower limb support section according to the third embodiment.

[0015] 1, 1A, 1B, 1C Radiotherapy fixture 10, 10A, 10B, 10C Back support section 20, 20A, 20B, 20C Neck support section 30, 30A, 30B, 30C Lumbar support section 40, 40A, 40B, 40C Lower limb support section 50, 50A, 50B, 50C Head support section 60, 60A, 60B, 60C Legs D Bed P Patient S Radiation therapy system T Top plate

[0016] <Radiation Therapy System> The radiation therapy system S includes a radiation therapy device L that irradiates the irradiation site of a patient P with therapeutic radiation and a bed D carrying a table T on which the patient assumes an irradiation position. The radiation therapy system S, including a medical linear accelerator, also includes an aiming device (not shown) such as a laser sight for patient alignment, an image matching device (not shown) that captures an image of the patient P on the table T to evaluate the positional deviation between the patient P in the treatment plan and the actual irradiation, and a movement device (not shown) that enables horizontal and rotational movement of the table T attached to the bed D, allowing for patient position correction based on the data obtained by the image matching device. A respiratory gating system, a moving body tracking system, a body surface monitoring system, etc. (not shown) may also be included. <Radiation Therapy Fixation Device> As shown in FIG. 1 , the radiation therapy fixation device 1 of the present invention is positioned between the patient P and the table T to support the patient P in a supine irradiation position within the radiation therapy system S. It is fixed at a predetermined position on the table T by a holding mechanism (not shown).

[0017] The radiotherapy fixation device 1 of the present invention includes a back support section 10 that supports the back of the patient P, a neck support section 20 that supports the neck of the patient P, a lumbar support section 30 that supports the lumbar region of the patient P, a lower limb support section 40 that supports the lower limbs of the patient P, a head support section 50 that supports the head of the patient P, legs 60 that can be fixed to the tabletop T, and a storage section 70 that allows the patient P to position their upper limbs on the back side of the patient P (FIG. 1).

[0018] The radiotherapy immobilization device 1 of the present invention may be used by being placed on a support table that can be fixed to a tabletop T. The radiotherapy immobilization device 1 is configured to be large enough to be accommodated in a simulation device such as a CT simulator and a radiotherapy system S. The radiotherapy immobilization device 1 may be configured to adjust the height H from the tabletop T and the angle θ of the patient P's upper body so as not to interfere with the gantry and image matching device of the radiotherapy device L. <Back Support Unit> The back support unit 10 includes a back support member 11 that supports the back of the patient P. The back support unit 10 can be positioned between the tabletop T placed on the bed D of the radiotherapy system S and the back of the patient P. The back support member 11 includes a portion that supports the patient P's midline at the shoulders. Therefore, when the patient P is in a supine position on the back support unit 10, the patient P's shoulders can be positioned outside the back support member 11. As a result, by providing the back support member 11 (protruding portion 12), it becomes possible to adduct the scapula, and the patient P can take an appropriate irradiation position.

[0019] The back support unit 10 is provided between the top board T of the bed D and the back of the patient P. Therefore, the patient P is positioned higher than the top board T, and the upper limbs can be moved toward the back of the patient P compared to when the back support unit 10 is not provided. As a result, the degree of freedom in the irradiation position is increased, and an appropriate irradiation position can be taken.

[0020] The back support section 10 is not limited to supporting the area around the shoulders of the patient P, and may also include a mode in which it supports the back of the upper and lower body of the patient P. That is, the back support section 10 may include some or all of the portions of the neck support section 20, lumbar support section 30, lower limb support section 40, and head support section 50, which will be described later, that contact and support the back of the patient P. Therefore, the back support section 10 (back support member 11) may be integrated with the neck support section 20 (neck support member 21), lumbar support section 30 (lumbar support member 31), lower limb support section 40 (lower limb support member 41), and head support section 50 (head support member 51), which will be described later, or each of these may be separate bodies.

[0021] The back support member 11 may also have raised portions 12 or recessed portions 13 to be placed on the back of the patient P. The raised portions 12 and recessed portions 13 are preferably symmetrical, but do not have to be symmetrical. When the back support member 11 has both raised portions 12 and recessed portions 13, the raised portions 12 can be two or more symmetrical raised portions centered on the center of the back.

[0022] Furthermore, the back support member 11 is preferably rectangular, but the shape is not particularly limited. <Neck Support Section> The neck support member 20 includes a neck support member 21 that supports the neck of the patient P. The neck support member 20 (neck support member 21) may be integrated with the back support member 10 (back support member 11) and the head support member 50 (head support member 51), which will be described later, or may be separate members. <Lumbar Support Section> The lumbar support member 30 includes a lumbar support member 31 that supports the lumbar region of the patient P. The lumbar support member 30 may include a cover 32 on the lumbar support member 31. The cover 32 prevents the patient P from falling off the radiotherapy fixation device 1. The cover 32 may include a cushion that is placed at the lumbar level of the patient P.

[0023] The lumbar support member 31 is preferably rectangular, but the shape is not particularly limited. The lumbar support member 30 (lumbar support member 31) may be integrated with the back support member 10 and the lower limb support member 40 (lower limb support member 41), which will be described later, or may be separate members. <Lower Limb Support Member> The lower limb support member 40 includes lower limb support members 41 that support the lower limbs of the patient P. The lower limb support member 41 can support or fix the patient P's lower limbs in an extended or flexed state. The lower limb support member 41 may include a cushion that contacts the area behind the patient P's knees. The lower limb support member 40 may be integrated with the lumbar support member 30 (lumbar support member 31), or may be separate members. <Head Support Member> The head support member 50 includes a head support member 51 that supports the head of the patient P. The patient P's head is supported or fixed on the surface of the head support member 51 of the head support member 50. As shown in FIG. 1 , the head support member 51 may include a fitting portion 52 into which the head of the patient P fits. The head support member 50 may be integrated with or separate from the neck support member 20 (neck support member 21). <Legs> The radiotherapy fixation device 1 includes legs 60 that can be fixed to the tabletop T by a holding mechanism (not shown). The legs 60 are appropriately provided on the back support member 10, neck support member 20, lumbar support member 30, lower limb support member 40, and head support member 50 to stably support and fix the radiotherapy fixation device 1 on the tabletop T. The legs 60 may be provided between the back support member 10 and the tabletop T. This configuration allows a space (accommodation portion 70) to be provided between the back of the patient P and the tabletop T in which the upper limbs can be accommodated. As a result, the patient P can be positioned appropriately for irradiation. The legs 60 preferably include front legs 61 that support the head side of the radiotherapy fixation device 1 and rear legs 62 that support the tail side of the radiotherapy fixation device 1, and it is more preferable that the lower limb support section 40 and the head support section 50 are each provided with the front legs 61 and rear legs 62 in order to stably support the patient P on the radiotherapy fixation device 1 on the tabletop T. With this configuration, a space (accommodation section 70) that can accommodate the upper limbs can be provided between the back of the patient P and the tabletop T. As a result, the patient P can be positioned appropriately for irradiation.

[0024] The leg sections 60 may be formed integrally with the back support section 10, neck support section 20, lumbar support section 30, lower limb support section 40, and head support section 50. Furthermore, when the back support section 10, neck support section 20, lumbar support section 30, lower limb support section 40, and head support section 50 are separate from the leg sections 60, the leg sections 60 and these components may be movable relative to each other. In this case, the radiotherapy fixation device 1 has fixing sections that fix these components to the leg sections 60. This configuration allows the leg sections 60 to be moved to a position on the tabletop T where the patient P can be stably supported, and the leg sections 60 and these components to be fixed in a position where the patient P can be stably supported, which is preferable because it increases the variety of irradiation positions for the patient P. Note that the number of legs 60 is not limited to two; it may be one, or three or more. <Storage Section> The radiotherapy fixation device 1 of the present invention includes a storage section 70 in which the patient P can place his or her upper limbs. The accommodation section 70 is provided on the back or side of the patient P when the patient P is in the supine position in the radiotherapy fixation device 1. That is, the accommodation section 70 is provided to be positioned between the back of the patient P (back support section 10) and the tabletop T so as to be able to accommodate the upper limbs. With this configuration, the upper limbs do not interfere with the irradiation field, and radiation can be irradiated to the irradiation site in an appropriate irradiation position.

[0025] The storage unit 70 may be provided so that the patient P can fix his / her upper limbs. In this case, the storage unit 70 includes a grip portion or the like that the patient P can hold with the palm of his / her hand. Examples of the grip portion include a handle, a lever, etc. The storage unit 70 may also include an upper limb cover for fixing the upper limbs.

[0026] Furthermore, when the radiotherapy fixation device 1 is placed on the tabletop T, the storage section 70 may be formed by the legs 60 between the back support section 10, the lumbar support section 30, or the lower limb support section 40 and the tabletop T. In this case, the storage section 70 becomes a space between the back support section 10, the lumbar support section 30, or the lower limb support section 40 and the tabletop T.

[0027] The height and width of the accommodation section 70 are not particularly limited as long as it allows the patient to assume an appropriate irradiation position and position the upper limbs.

[0028] The material of the radiotherapy fixing device 1 of the present invention is not particularly limited, but it is preferable to use a radiotransparent material.

[0029] In the radiotherapy fixation device 1 of the present invention, the back support section 10 that supports the back of the patient P, the neck support section 20 that supports the neck of the patient P, the lumbar support section 30 that supports the lumbar region of the patient P, the lower limb support section 40 that supports the lower limbs of the patient P, the head support section 50 that supports the head of the patient P, and the legs 60 that can be fixed to the tabletop T may be integrated or may be separate. Also, some of the components may be integrated while the remaining components are separate. <First Embodiment> Next, embodiments of the present invention will be described with reference to the drawings. First, a first embodiment of the present invention will be described.

[0030] As shown in Figures 2 and 3, the back support section 10A of the radiotherapy fixation device 1A includes a back support member 11A that supports the back of the patient P, and a neck support member 20A. That is, the back support member 10A includes the neck support member 20A. The back support member 11A includes a raised portion 12A and a recessed portion 13A. In this embodiment, the back support member 10A is generally rectangular, with a length direction along the midline of the patient P and a width direction intersecting the length direction. The back support member 10A can be placed on a tabletop T or a support base that can be placed on the tabletop T. Although the back support member 10A and the neck support member 20A are shown as being integrated in Figure 3, these members may also be configured as separate members.

[0031] The back support member 11A (protruding portion 12A) has a recess 13A extending longitudinally in the center. When the patient P is placed in a supine position, the recess 13A is positioned so that the midline (spine) of the patient P is aligned with the recess. As a result, the midline of the patient P can be properly fixed. This is particularly preferable as it allows for the positioning of patients with kyphosis, whose spine is tilted forward.

[0032] The neck support part 20A includes neck covers 22A on both sides of the neck support material 21A. The neck covers 22A have a shape that fits the neck of the patient P. This allows the neck of the patient P to be securely fixed by the neck support part 20A.

[0033] A narrow portion 14A is provided between the back support member 11A and the neck support member 20A (neck support member 21A). The narrow portion 14A is narrower in the width direction than the protruding portion 12A and the neck support member 20A and has a constricted shape. The narrow portion 14A has a width sufficient to support at least the midline of the patient P (around the spine). Therefore, when the patient P is in the supine position with the radiotherapy fixation device 1A, the midline of the patient P (around the spine) is supported and fixed, while at least a portion of the patient P's scapulae is not fixed. This increases the range of motion of the shoulder joint, facilitating dorsal extension of the shoulder joint, allowing the patient P to assume an appropriate irradiation position.

[0034] When the patient P is in a supine position on the back support member 10A, the patient P's back is supported, the neck is supported and fixed, and the patient P's upper limbs can be positioned outside the back support member 11A. The back support member 10A is provided between the top plate T of the bed D and the back of the patient P. Therefore, the patient P is positioned higher than the top plate T, and the patient P's upper limbs can be moved toward the back side compared to when the back support member 10A is not provided. As a result, the degree of freedom in the irradiation position is increased, and an appropriate irradiation position can be adopted.

[0035] The raised portion 12A is provided in the center of the back support portion 10A. The raised portion 12A has a slope from the apex toward the back support member 11A. When the back of the patient P is placed on the raised portion 12A, the patient P opens his / her chest on the back support portion 10A. As a result, the shoulder joints are extended in the dorsal direction, allowing the patient P to assume an appropriate irradiation position.

[0036] In another example of this embodiment, the rear support portion 10a may include a rear support material 11a, which may include a plurality of raised portions 12a (FIG. 4). The rear support portion 10a may be placed on a tabletop T or a support base that can be placed on the tabletop T. The rear support material 11a behind the plurality of raised portions 12a has a flat portion 15a, which may be provided with a recess 13a.

[0037] The plurality of protrusions 12a come into contact with the spine and the periphery of the scapulae when the patient P is in a supine position. The head and neck of the patient P are supported by the head support portion 50a and the neck support portion 20a, respectively.

[0038] In this state, when the patient P lies supine on the back support part 10a, the back support part 10a has multiple protrusions 12a, which allow the patient P's own weight to push up around the spine, opening the chest further and allowing the patient P to assume an appropriate irradiation position (Figure 5).

[0039] In other embodiments, the back support portion 10a and the neck support portion 20a may be separate bodies.

[0040] The apexes of the protruding portions 12A and 12a come into contact with the back of the patient P, and therefore can be made of a soft material such as urethane to reduce the burden on the patient.

[0041] As an example of the lower limb support unit 40, the lower limb support unit 40A includes a triangular prism-shaped lower limb support member 41A (FIG. 6) so that the lower limb can be supported and fixed in a bent state. This supports the lower limb of the patient P and makes it easier to fix the lower limb in a bent state.

[0042] Another embodiment of the lower limb support part 40 is shown in Figure 7. The lower limb support part 40A has a lower limb support member 41a, and the lower limb support member 41a has a mold 42a whose slope that comes into contact with the lower limb of the patient P allows the lower limb to fit into the mold 42a. The mold 42a is configured so that the thigh, knee, and calf can fit into the mold 42a. This makes it easier for the lower limb of the patient P to fit into the mold 42a and to fix the lower limb in a flexed state.

[0043] The head support portion 50A may be anything that supports the head of the patient P protruding from the neck support portion 20, such as a pillow.

[0044] The legs 60A include front legs 61A extending from the neck support section 20A to the head support section 50A, and rear legs 62A extending from the lumbar support section 30A to the lower limb support section 40A. As a result, an accommodation section 70A capable of accommodating the upper limbs of the patient P is formed between the table top T and the back support section 10A, the lumbar support section 30A, or the lower limb support section 40A.

[0045] The lower back support section 30A, the lower leg support section 40A, and the head support section 50A may be integrated or may be separate.

[0046] Furthermore, the location of the leg section 60A is not particularly limited as long as the accommodation section 70A is provided and the patient P can be stably supported in the supine position. The accommodation section 70A is not limited to being provided between the table top T and the back support section 10A, the lumbar support section 30A, or the lower limb support section 40A, and may be configured by providing a hole in the leg section 60A, for example.

[0047] In this embodiment, the back support portion 10A may extend further toward the head than the neck cover 22A and include a head support portion 50A. The back support portion 10A may also extend further toward the lower legs than the raised portion 12A or the flat portion 15a and include a lower leg support portion 40A. <Second Embodiment> Next, a second embodiment of the present invention will be described. The following description will focus on the configurations that differ from the first embodiment.

[0048] The back support section 10B of the radiotherapy fixation device 1B according to the second embodiment includes a neck support section 20B, a lumbar support section 30B, and a lower limb support section 40B. That is, the back support section 10B includes the neck support section 20B, the lumbar support section 30B, and the lower limb support section 40B. The lower limb support section 40B includes a triangular prism-shaped lower limb support member 41B so that the lower limbs can be supported and fixed in a flexed state. As shown in FIG. 8 , the back support section 10B is inclined from the neck support section 20B toward the lumbar support section 30B, allowing the patient P to be fixed in a semi-seated position. The angle θ and height H of the back support section 10B may be adjusted by an angle- and height-adjusting mechanism included in the radiotherapy fixation device 1B. Alternatively, the angle θ and height H of the back support section 10B may be predetermined.

[0049] In this embodiment, the radiotherapy fixing device 1B includes a stopper 43B for fixing the buttocks on the tabletop T. This makes it easy to fix the patient P on the tabletop T in a semi-sitting position.

[0050] The head support unit 50B may be integrated with the back support unit 10B or may be separate, as long as it supports the head of the patient P protruding from the neck support unit 20B. The height H and angle θ must be adjustable so that the head of the patient P and the head support unit 50B do not interfere with the gantry and image matching device of the radiation therapy device L.

[0051] Leg section 60B includes front legs 61B provided on neck support section 20B and rear legs 62B extending from lumbar support section 30B to lower leg support section 40B. Back support section 10B is inclined from neck support section 20B toward lumbar support section 30B. A storage section 70B is formed between table top T and back support section 10B.

[0052] In FIG. 8, the front legs 61B are not in contact with the top plate T and are not supported thereon, but the front legs 61B may be in contact with the top plate T and supported thereon.

[0053] The location of the legs 60B is not particularly limited as long as the accommodation section 70B is provided and the patient P can be stably supported and fixed in a semi-sitting position. The accommodation section 70B is not limited to being provided between the table top T and the back support section 10A or the lumbar support section 30A, and may be configured by providing holes in the legs 60B, for example.

[0054] Furthermore, in this embodiment, the rear legs 62B extending from the lumbar support section 30B to the lower limb support section 40B are not an essential component. In this case, the front legs 61B are supported and fixed on the tabletop T to support the upper body of the patient P. Furthermore, by providing the rear legs 62B on the lumbar support section 30B, the radiotherapy fixation device 1B can be stably fixed on the tabletop T. The buttocks of the patient P may be placed on the tabletop T of the bed D, and in this case, the lower body of the patient P is supported and fixed on the tabletop T by the stoppers 43B and the lower limb support section 40B (lower limb support members 41B). <Third Embodiment> A third embodiment of the present invention will be described. Note that the following description will focus on configurations that differ from the first and second embodiments.

[0055] A lower limb support section 40C of a radiotherapy fixing device 1C according to the third embodiment includes lower limb supports 41C that support the lower limbs of a patient P from the dorsal side, as well as lower limb covers 42C that fix the lower limbs from the ventral side ( FIG. 9 ). This ensures that the feet of the patient P are fixed securely.

[0056] Another embodiment of the lower limb support unit 40C includes a foot cover 43C for securing the feet of the patient P (FIG. 10). The foot cover 43C includes a sole support unit 44C that contacts the sole of the foot and a side cover 45C that covers the side of the foot. This ensures that the soles of the patient P are secured in place. It also prevents the patient P from falling off the tabletop T.

[0057] The lower limb support section 40C may be a lower limb support member 41C that supports the lower limbs from the dorsal side once the feet of the patient P are fixed, and the lower limb cover 42C that fixes the lower limbs from the ventral side is not essential, and the lower limb support member 41C may fix the lower limbs of the patient P from the sides. <Other Embodiments> In the first embodiment, the back support section 10A may be placed on a support base that can be placed on the tabletop T. In this case, the support base may include a head support section, a lumbar support section, and a lower limb support section, and the back support section may be placed between the head support section and the lumbar support section.

[0058] The fixation device for radiotherapy of the present invention can be used in radiotherapy.

Claims

1. A radiation therapy fixation device used when a patient is in a supine irradiation position, the radiation therapy fixation device comprising: a back support section that can be positioned between the patient's back and a tabletop mounted on a bed provided in a radiation therapy system; and legs that can be fixed to the tabletop, the back support section having a raised section in the center.

2. A radiation therapy fixation device used when a patient is in a supine irradiation position, the radiation therapy fixation device comprising: a back support part that can be placed between the patient's back and a tabletop mounted on a bed provided in a radiation therapy system; and legs that can be fixed to the tabletop, the back support part having a recess in the center.

3. A radiation therapy fixation device used when a patient is in a supine irradiation position, the radiation therapy fixation device comprising: a back support section that can be positioned between the patient's back and a tabletop mounted on a bed provided in a radiation therapy system; and legs that can be fixed to the tabletop, the back support section having a narrow section with a width that supports the area around the patient's spine.

4. A radiotherapy fixation device according to any one of claims 1 to 3, comprising a housing portion capable of housing the patient's upper limbs, the housing portion being partly or entirely provided on the back or side of the patient.

5. A radiotherapy fixation device according to any one of claims 1 to 3, wherein the back support section is provided with a neck support section that can accommodate at least the circumference of the patient's neck.

6. A radiotherapy fixation device used when a patient is in a supine irradiation position, the radiotherapy fixation device comprising: a back support section that can be positioned between the patient's back and a tabletop mounted on a bed provided in a radiotherapy system; a lumbar support section or a lower limb support section that can be positioned between the tabletop and the patient's lower back or lower limbs; legs that can be fixed to the tabletop; and a storage section that can store the patient's upper limbs, with part or all of the storage section being provided between the tabletop and the lumbar support section or the lower limb support section.

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