Fixture for radiation treatment

Abstract

To provide a fixture for radiation treatment that facilitates extension of the shoulder joint in the dorsal direction in the supine position, and that enables an irradiation site to be irradiated in an appropriate irradiation body position even when the upper limbs cannot be raised.SOLUTION: A fixture for radiation treatment to be used with a patient in the supine irradiation position comprises: 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.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fixation device for radiotherapy. [Background technology] Radiation therapy is a treatment in which radiation is directed at a patient's tumor.

[0002] Radiation therapy generally involves the following process: (1) The patient's irradiation position is determined, and an immobilization device is created to hold the patient in that irradiation position. 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 established using the immobilization device created in (1), and accurate setup and position matching are performed using body surface markers, a laser sight, a light irradiation field, an image matching device, etc., before radiation is delivered.

[0003] 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.

[0004] 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 maintain the patient in a supine position with both arms elevated. 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.

[0005] Patent Document 1 discloses a radiation therapy fixation device for use in 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 lifted position. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5770592 Summary of the Invention [Problem to be solved by the invention]

[0007] 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 conventional irradiation positions and immobilization devices, which may actually reduce the accuracy of patient immobilization. For example, there are cases where a patient is 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.

[0008] An object of the present invention is to provide a technique for solving the above-mentioned problems. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the radiotherapy fixation device of the present invention is a radiotherapy fixation device used with a patient in a supine irradiation position, and is equipped with 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.

[0010] In order to achieve the above-mentioned object, the radiotherapy fixation device of the present invention is a radiotherapy fixation device used in an irradiation position in which a patient is lying on his / her back, and is equipped with a back support part that can be placed between the back of the patient and a tabletop mounted on a bed provided in a radiotherapy system, and a storage part that is positioned between the back support part and the tabletop and can store the upper limbs of the patient. [Effects of the Invention]

[0011] According to the present invention, the shoulder joint can be easily extended in the dorsal direction in the supine position, and even if the upper limbs cannot be raised, radiation can be irradiated to the irradiation site in an appropriate irradiation position. [Brief explanation of the drawings]

[0012] [Figure 1] 1A and 1B are diagrams showing the configuration of a fixation device for radiotherapy according to the present invention. [Figure 2] FIG. 2 is a view (front view) showing a back surface support part according to the first embodiment. [Figure 3] FIG. 2 is a view (side view) showing a back surface support part according to the first embodiment. [Figure 4] FIG. 10 is a view (perspective view) showing another example of the back surface support part according to the first embodiment. [Figure 5] FIG. 5 is a view showing a patient placed in a supine position on the back support shown in FIG. 4. [Figure 6] FIG. 2 is a diagram (perspective view) showing an example of a lower limb support part according to the first embodiment. [Figure 7] FIG. 10 is a view (perspective view) showing another example of the lower limb support part according to the first embodiment. [Figure 8] FIG. 10 is a diagram showing the configuration of a fixing device for radiotherapy according to a second embodiment. [Figure 9] FIG. 10 is a diagram showing the configuration of a fixing device for radiotherapy according to a third embodiment. [Figure 10] 10A and 10B are diagrams showing examples of a lower limb support part according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] <Radiation therapy system> The radiation therapy system S includes a radiation therapy device L that irradiates the irradiation area of ​​a patient P with therapeutic radiation, and a bed D that carries a tabletop T on which the patient assumes an irradiation position. The radiation therapy system S, including a medical linear accelerator, is equipped with an aiming device (not shown) such as a laser aimer used for patient aiming, an image matching device (not shown) that captures an image of the patient P on the tabletop T to evaluate the positional deviation between the patient P in the treatment plan and the patient P during actual irradiation, and a movement device (not shown) that enables the tabletop T attached to the bed D to move horizontally and / or rotationally, and is capable of correcting the patient's position based on the data obtained by the image matching device. A respiratory synchronization system, a moving body tracking system, a body surface monitoring system, etc. (not shown) may also be included.

[0014] <Radiation therapy fixture> The radiotherapy fixing device 1 of the present invention is used by being placed between the patient P and the tabletop T in order to support the patient P in a supine irradiation position within the radiotherapy system S, and is fixed at a predetermined position on the tabletop T by a holding mechanism not shown. The radiotherapy fixation device 1 of the present invention includes a back support section 10 that supports the back of patient P, a neck support section 20 that supports the neck of patient P, a lumbar support section 30 that supports the lumbar region of patient P, a lower limb support section 40 that supports the lower limbs of patient P, a head support section 50 that supports the head of patient P, leg sections 60 that can be fixed to the tabletop T, and a storage section 70 that allows patient P to position their upper limbs on the back side of patient P (Figure 1). The radiotherapy fixing device 1 of the present invention may be used by being placed on a support base that can be fixed on a tabletop T. The radiotherapy fixing device 1 is configured to be large enough to be housed in a simulation device such as a CT simulator and a radiotherapy system S. The radiotherapy fixing device 1 may be configured so that the height H from the tabletop T and the angle θ of the upper body of the patient P are adjustable so as not to interfere with the gantry and image matching device of the radiotherapy device L.

[0015] <Back support part> 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 placed between the back of the patient P and a tabletop T placed on a bed D included in the radiation therapy system S. The back support member 11 includes a portion that supports the midline of the patient P at the shoulders of the patient P. Therefore, when the patient P assumes a supine position on the back support unit 10, the shoulders of the patient P can be positioned outward of the back support member 11. As a result, the back support member 11 (protruding portion 12) allows for adduction of the scapula, enabling the patient P to assume an appropriate irradiation position. The back support part 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 part 10 is not provided. As a result, the degree of freedom in the irradiation position increases, and an appropriate irradiation position can be taken.

[0016] 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. In other words, the back support section 10 may include some or all of the areas where the neck support section 20, lumbar support section 30, lower limb support section 40, and head support section 50, which will be described later, 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 them may be separate.

[0017] 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.

[0018] Furthermore, the back support member 11 is preferably rectangular, but the shape is not particularly limited.

[0019] <Cervical support> The neck support section 20 includes a neck support member 21 that supports the neck of the patient P. The neck support section 20 (neck support member 21) may be integrated with the back support section 10 (back support member 11) and a head support section 50 (head support member 51) described below, or may be separate from them.

[0020] <Lumbar support part> The lumbar support unit 30 includes a lumbar support member 31 that supports the lumbar region of the patient P. The lumbar support unit 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.

[0021] 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) described later, or may be separate from them.

[0022] <Lower limb support section> The lower limb support section 40 includes a lower limb support member 41 that supports the lower limbs of the patient P. The lower limb support member 41 can support or fix the lower limbs of the patient P in an extended or flexed state. The lower limb support member 41 may include a cushion that contacts the area behind the knees of the patient P. The lower limb support section 40 may be integrated with the lumbar support section 30 (lumbar support member 31) or may be a separate member.

[0023] <Head support> The head support unit 50 includes a head support member 51 that supports the head of the patient P. The head of the patient P is supported or fixed on the surface of the head support member 51 of the head support unit 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 unit 50 may be integrated with the neck support unit 20 (neck support member 21) or may be a separate member.

[0024] <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 provided as appropriate on the back support section 10, neck support section 20, lumbar support section 30, lower limb support section 40, and head support section 50 to stably support and fix the radiotherapy fixation device 1 on the tabletop T. The legs 60 can be provided between the back support section 10 and 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 take an appropriate irradiation position.

[0025] The legs 60 preferably include front legs 61 that support the head side of the radiotherapy immobilization device 1 and rear legs 62 that support the tail side of the radiotherapy immobilization device 1, and more preferably, the front legs 61 and the rear legs 62 are provided on the lower limb support section 40 and the head support section 50, respectively, in order to stably support the patient P on the radiotherapy immobilization 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 take an appropriate irradiation position.

[0026] The leg sections 60 may be formed integrally with the back support section 10, the neck support section 20, the lumbar support section 30, the lower limb support section 40, and the head support section 50. Furthermore, when the back support section 10, the neck support section 20, the lumbar support section 30, the lower limb support section 40, and the head support section 50 are separate from the leg sections 60, the leg sections 60 and these members may be provided so as to be movable relative to each other. In this case, the radiotherapy fixing device 1 has fixing sections that fix these members to the leg sections 60. This configuration makes it possible to move the leg sections 60 to a position on the tabletop T where the patient P can be stably supported, and to fix the leg sections 60 and these members at 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. The number of legs 60 is not limited to two, and may be one, or three or more.

[0027] <Containment Unit> The radiotherapy immobilization device 1 of the present invention includes a housing section 70 in which the patient P can place his or her upper limbs. The housing section 70 is provided on the back or side of the patient P when the patient P is in a supine position in the radiotherapy immobilization device 1. In other words, the housing section 70 is provided to be located between the back of the patient P (back support section 10) and the tabletop T and can house 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.

[0028] The storage section 70 may be provided so that the patient P can fix his / her upper limbs. In this case, the storage section 70 has 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. Also, the storage section 70 may have an upper limb cover for fixing the upper limbs.

[0029] 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.

[0030] The height and width of the accommodation section 70 are not particularly limited as long as it allows the patient to take an appropriate irradiation position and position the upper limbs. The material of the radiotherapy fixing tool 1 of the present invention is not particularly limited, but it is preferable to use a radiotransparent material.

[0031] In the radiotherapy fixing 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 leg section 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 may be separate.

[0032] 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.

[0033] 2 and 3, the back support part 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 part 10 includes the neck support member 20. The back support member 11 includes a raised portion 12A and a recessed portion 13A.

[0034] In this embodiment, the back support part 10A is generally rectangular in shape, with a length direction along the midline of the patient P and a width direction intersecting the length direction. The back support part 10A can be placed on the tabletop T or a support base that can be placed on the tabletop T. Although the back support part 10A and the neck support part 20A are shown as being integrated in FIG. 3, these members may also be configured as separate members.

[0035] The back support member 11 (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.

[0036] The neck support part 20A is provided with 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.

[0037] 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 region (around the spine) of the patient P. Therefore, when the patient P assumes a supine position in the radiotherapy immobilization device 1A, the midline region (around the spine) of the patient P is supported and immobilized, while at least a portion of the patient P's scapulae is not immobilized. This increases the range of motion of the shoulder joint of the patient P, facilitating dorsal extension of the shoulder joint, and allowing the patient P to assume an appropriate irradiation position.

[0038] When the patient P is in a supine position on the back support member 10A, the back of the patient P is supported, the neck is supported and fixed, and the upper limbs of the patient P can be positioned outside the back support member 11A. The back support member 10 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 can move his / her upper limbs toward the back side compared to when the back support member 10 is not provided. As a result, the degree of freedom in the irradiation position is increased, and an appropriate irradiation position can be adopted.

[0039] The raised portion 12A is provided in the center of the back support member 10A. The raised portion 12A has a slope from its apex toward the back support member 11A. When the back of the patient P is placed on the raised portion 12, the patient P opens his / her chest on the back support member 10A. As a result, the patient P can assume an appropriate irradiation position.

[0040] In another example of this embodiment, the rear support portion 10a may include a rear support member 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 member 11a behind the plurality of raised portions 12a has a flat portion 15a, which may be provided with a recess 13a.

[0041] 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.

[0042] In this state, when patient P lies supine on back support part 10a, back support part 10a has multiple protrusions 12a, which allow patient P's own weight to push up around the spine, opening the chest further and allowing patient P to assume an appropriate irradiation position (Figure 5).

[0043] In other embodiments, the back support portion 10a and the neck support portion 20a may be separate bodies.

[0044] 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 strain on the patient.

[0045] As an example of the lower limb support unit 40, the lower limb support unit 40A is provided with a triangular prism-shaped lower limb support member 41A so that the lower limb can be supported and fixed in a bent state (FIG. 6). This supports the lower limb of the patient P and makes it easier to fix the lower limb in a bent state.

[0046] 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. The mold 42a is configured so that the thigh, knee, and calf can fit into the mold. 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.

[0047] The head support part 50A may be anything that supports the head of the patient P protruding from the neck support part 20, such as a pillow.

[0048] 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, a storage section 70A capable of storing 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.

[0049] 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 bodies.

[0050] Furthermore, the location of the leg portion 60A is not particularly limited as long as the accommodation portion 70A is provided and the patient P can be stably supported in the supine position. The accommodation portion 70A is not limited to being provided between the table top T and the back support portion 10A, the lumbar support portion 30A, or the lower limb support portion 40A, and may be configured by providing a hole in the leg portion 60A, for example.

[0051] In this embodiment, the back support part 10A may extend further toward the head than the neck cover 22A and include a head support part 50A. The back support part 10A may also extend further toward the lower legs than the raised part 12A or the flat part 15a and include a lower leg support part 40A.

[0052] <Second embodiment> Next, a second embodiment of the present invention will be described, focusing on the configuration that differs from the first embodiment.

[0053] 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 bent 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, so that the patient P can 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.

[0054] In this embodiment, the radiotherapy fixing tool 1 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.

[0055] Head support unit 50B may be integrated with back support unit 10B or may be separate, as long as it supports the head of patient P protruding from neck support unit 20B. The height H and angle θ must be adjustable so that the head of patient P and head support unit 50B do not interfere with the gantry and image matching device of radiation therapy device L.

[0056] 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.

[0057] In FIG. 8, the front legs 61B are not in contact with the top board T and are not supported thereon, but the front legs 61B may be in contact with the top board T and supported thereon.

[0058] The location of the legs 60B is not 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.

[0059] 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 immobilization 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 sections 40B (lower limb supports 41B).

[0060] <Third embodiment> A third embodiment of the present invention will be described below, focusing on the configurations that differ from the first and second embodiments.

[0061] 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.

[0062] Another embodiment of the lower limb support section 40C includes a foot cover 43C for fixing the feet of the patient P (FIG. 10). The foot cover 43C includes a sole support section 44C that contacts the sole of the foot, and a side cover 45C that covers the foot from the sides. This ensures that the soles of the patient P are fixed securely. It also prevents the patient P from falling off the tabletop T.

[0063] The lower limb support portion 40C is a lower limb support material 41C that supports the lower limbs from the dorsal side once the patient P's feet are fixed, and the lower limb cover 42C that fixes the lower limbs from the ventral side is not required, and the lower limb support material 41C may also be used to fix the patient P's lower limbs from the side.

[0064] <Other embodiments> In the first embodiment, the back support portion 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 portion, a lumbar support portion, and a lower limb support portion, and the back support portion may be placed between the head support portion and the lumbar support portion. [Industrial Applicability]

[0065] The fixation device for radiotherapy of the present invention can be used in radiotherapy. [Explanation of symbols]

[0066] 1, 1A, 1B, 1C Radiotherapy fixtures 10, 10A, 10B, 10C Rear support section 20, 20A, 20B, 20C Cervical Support 30, 30A, 30B, 30C Lumbar support 40, 40A, 40B, 40C Lower limb support section 50, 50A, 50B, 50C Head support 60, 60A, 60B, 60C legs D-class sleeper P patient S Radiation Therapy System T Top plate

Claims

1. a radiation therapy fixation device used when a patient is in a supine irradiation position, the fixation device comprising: a back support portion that can be placed between a top board mounted on a bed provided in a radiation therapy system and the back of the patient; and legs that can be fixed to the tabletop.

2. The radiotherapy fixation device according to claim 1 , further comprising a housing portion capable of housing an upper limb of the patient.

3. The radiotherapy fixation device according to claim 2 , wherein a part or all of the accommodation portion is provided between the top plate and the back support portion.

4. The radiotherapy fixation device according to claim 1 , wherein the back support portion has a raised portion in the center.

5. The radiotherapy fixation device according to claim 1 , wherein the back support portion includes a neck support portion that can be stored around at least the neck of the patient.

6. The radiotherapy fixation device according to claim 1 , wherein the back support portion has a recess in the center.

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