JPH07148279A - Chest fixing device for radiation treatment - Google Patents

Abstract

PURPOSE:To improve the reproducibility of tangent irradiation with radiations and to improve treatment efficiency while preventing a side effect and simultaneously to lessen a patient's burden during treatment. CONSTITUTION:The chest of the patient lying supine onto a base plate 11 is fixed by using a shell 20 molded from the shoulder to the costal arch so as to meet the patient's chest. This shell 20 has an approximately OMEGA-shaped section and is so designed as to support the patient's chest from the back side as well and, therefore, the twist of the chest is prevented and simultaneously, the patient's body is gently held. The fixing device is constituted to enable the patient to clamp either part of clamping parts 35 and, therefore, the device is usable even for the patient who has a difficulty in raising the arm without burden.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration of a chest fixing apparatus suitable for tangential irradiation therapy in the treatment of early stage breast cancer.

[0002]

2. Description of the Related Art Breast-conserving therapy for early-stage breast cancer has become popular in recent years. In this therapy, when irradiating the breast, chest wall or lymph gland of a patient, it is important to irradiate the patient's body with high accuracy and reproducibility. When irradiating the chest with radiation, tangential irradiation is used to avoid the effect of radiation on the lungs, but it is necessary to maintain this irradiation position accurately so that irradiation can be performed with reproducibility in repeated treatments. It is important to avoid the side effects of radiation, shorten the treatment time and provide effective treatment, and reduce the burden on the patient.

Therefore, some devices for fixing the chest have been conventionally used. For example, there is a fixing device in which a rod is placed above the head so that both hands can be lifted and grasped while the patient is lying on his back. There is also a fixing device including a jig for holding the head and neck and the arm lifted to the side of the head. When irradiating radiation, such a device is used to keep the patient on the back in the same state as much as possible, and the mark attached to the patient's body is irradiated as a target to improve reproducibility.

[0004]

In recent years, in tangential irradiation using such an apparatus, some problems have been pointed out in order to further improve reproducibility. For example, with a fixation device such as the one described above, the patient would have to grab a rod prepared for the device or extend the arm upwards in line with the jig. Raising the arm according to the device in this manner causes pain for a patient whose arm does not rise so much due to surgery for breast cancer. In addition, reproducibility decreases when the patient moves to avoid this distress.

Further, even if the person lays on his / her back in the same position on the bed, the position of the mark on the body is changed due to the slight twist of the body. Further, due to such a twist, the positional relationship between the mark attached to the body and the lungs also changes, and reproducibility deteriorates. Further, even if the person lays on his / her back so as not to be twisted as much as possible, the position of the mark on the body may change due to the inclination of the breast at that time. Since it takes a very long time to adjust the body orientation and position so that fluctuations due to these factors do not occur as much as possible, the treatment time becomes long and the burden on the patient is heavy.

Further, in the fixing device as described above, since the mark as the irradiation target is directly attached to the patient's body, the patient's mental burden such as making the mark invisible in the normal living environment is also imposed. large. In addition, there is also a problem that treatment with good reproducibility cannot be performed if the marking is faded, such as in summer.

In order to omit marking on the body, a mesh-like thermoplastic shell material may be formed in conformity with the chest, and lead or the like may be used as a weight to cover the chest of a patient lying on the bed. However, in the treatment plan that is performed prior to the irradiation of radiation for marking, the CT image is affected by the metal, which causes a problem that a satisfactory treatment plan cannot be built. Further, merely covering the chest with the shell material does not serve to improve the reproducibility described above.

Therefore, it is an object of the present invention to provide a chest fixing device capable of emitting radiation with good reproducibility, providing efficient treatment and reducing the burden on the patient. Also, for patients with limited vertical arm movement,
It is also an object to provide a chest fixation device that can be easily subjected to radiation therapy. Also, to provide a fixing device that can take time for adjustment such as twisting of the body and tilt of the breast, or can easily fix even a difficult-to-adjust portion, improve reproducibility, improve treatment efficiency, and shorten treatment time. Is also intended. Further, it is an object of the present invention to provide a chest fixing device which can avoid direct marking on the body of a patient and can easily make an accurate treatment plan.

[0009]

A chest fixing device for radiotherapy according to the present invention includes a non-metal substrate whose chest can be set on its back and at least shoulders including the chest of each patient lying on its back. Thermoplastic shell with a cross section of approximately Ω shaped to match the arch of the bone, position adjusting means for adjusting the position of each person's head and neck relative to the chest held by this shell, and both sides of the shell It has a non-metallic elongated fixing means for sandwiching and fixing at least a part of the end portion.

In order to reduce the influence on the CT image when making a treatment plan, a non-metallic material such as acrylic or wood is used for the substrate and the fixing means. An acrylic or wooden elongated plate that can sandwich the shell can be used as a fixing means, but a metal fitting for fixing the plate to the substrate can be attached to a place apart from the chest to reduce the influence on the CT image. desirable. The same applies to hinges and the like. When the fixing hardware is arranged in this manner, it becomes difficult to uniformly hold down the shell by the plate. Therefore, in the fixing device according to the present invention, a highly elastic member such as a rubber plate is sandwiched between the plate and the substrate, and the end portion of the shell can be securely fixed via the member. The shape of the plate is generally rectangular, but in order to pinch the end of the shell along the patient's body as long as possible, it is curved along the patient's body, especially as it approaches the armpit. Is effective.

Further, the chest fixing device according to the present invention includes a thermoplastic shell having a substantially Ω-shaped cross section formed to fit the auxiliary arch from at least the shoulder including the chest of each patient lying on his back. ing. The shell according to the present invention is formed so as to have a substantially Ω shape in which both sides of the shell wrap around the back surface of the chest, unlike the conventionally-shaped inverted U-shaped shell. With such a shape, the shell can be held from the front surface to the back surface of the chest, so that the body of the patient lying on his back on the substrate can be prevented from being twisted. Further, by using the shell having a shape that wraps around the back surface, both sides of the shell come into contact with the back surface of the patient, and the front surface of the shell can be brought into close contact with the patient's breast or the like with appropriate pressure. Therefore, the breast can be prevented from tilting and the shape of the patient's body can be maintained in a certain shape. In this case, the patient's body is not pressed more than necessary and the burden on the patient's body is very small. Rather, since a feeling of holding that fits a curved body from the side surface to the back surface is obtained, the degree of fatigue during irradiation or during treatment planning can be reduced.

Furthermore, the marking that is the target of irradiation is
Since it does not have to be attached to the patient's body but to be attached to this shell, the mental burden on the patient for marking can be eliminated. Moreover, since the marking does not disappear, the burden on the therapist can be reduced. Therefore, by using the shell according to the present invention, the twisting of the body and other small body movements can be kept at a position close to the treatment plan any number of times without burdening the patient, and thus reproducibility is significantly improved. it can. Since the degree of fatigue of the patient can be reduced, it is possible to prevent the irradiation position from fluctuating due to movements during irradiation.

Further, since the end portion of the Ω type shell is parallel to the substrate when mounted on the patient, the shell can be easily fixed to the substrate by sandwiching the end portion with the fixing means. Further, since the shell can be formed along the body of the patient even from the shoulder to the base of the arm, radiation treatment can be performed with the hand raised to an angle that does not burden the patient. At that time, it is desirable that the position from the chest to the head can be adjusted. This is to reduce the burden on the patient by keeping the position of the head relative to the chest at the patient's natural position. Further, if the position of the chest and the head is different for each irradiation, the reproducibility is deteriorated due to a change in the height of the chest on the substrate.

In order to adjust the position of the head, for example, a grip which is slid along the substrate and can be grasped in a state of being laid on its back is provided, and the position of the grip grasped by the patient in a natural state is irradiated. It can be reproduced each time and the head can be set accordingly. In order to reproduce the position of the grip, it is effective to provide a measure that marks the position of the grip with respect to the substrate.

Further, a head / neck holding means for supporting the head or neck slidable along the substrate may be used. Also in this case, it is desirable to provide a measure or the like so that the position of the head and neck holding means with respect to the substrate can be reproduced.
Further, if the height of the head and neck can be changed depending on the patient, the burden on the patient can be further reduced. Since the arm of a patient to be exposed to radiation must still be raised above the head, in order to reduce the degree of fatigue of the patient, a slidable head and neck holding means is provided and at the same time a predetermined amount is provided. It is desirable to provide a movable grip that pivots or slides in position so that it can be gripped at the patient's natural position.

Further, in order to improve reproducibility, it is also effective to provide a shoulder fixing means for sandwiching and fixing the end of the portion formed in conformity with the shoulder of the shell with the substrate. Further, if at least one hole is provided at both end portions of the shell and the fixing means has a protrusion penetrating the hole,
The relative position between the shell and the substrate can be easily reproduced.

[0017]

【Example】

[Embodiment 1] FIG. 1 shows a chest fixing device according to Embodiment 1 of the present invention in a developed state. Further, FIG. 2 shows a state in which the patient's chest is fixed by this device. And FIG.
FIG. 3 shows a side view of the device so that the cross section of the shell used in this device can be seen.

First, the chest fixing device 10 of this example comprises a substantially rectangular base plate 11 to which the shell 20 and the head / neck support 30 are attached. The substrate 11 of the device 10 of this example is C
Although a transparent acrylic plate material is used to reduce the influence on the T image, a non-metal member such as wood can be used instead. A head / neck support portion 30 is slidably attached to the substrate 11 above the substrate 11 where the head is located when the patient lies on his / her back on the substrate 11. The head-and-neck part 30 of this example includes a substantially rectangular support substrate 31 made of acrylic, and a groove 32 is formed at one end thereof so as to be movable along the substrate 11. From the substrate 11 through the groove 32 to the supporting substrate 3
Using the fixing fittings 33 such as screws protruding on the surface of 1,
The support substrate 31 of the head / neck support portion 30 can be fixed to the substrate 11. In addition, marks 34 such as a measure with a graduation are attached at regular intervals along the groove 32 or the end of the support substrate 31. This mark 34
Is used, the positional relationship between the support substrate 31 and the substrate 11 can be accurately reproduced.

A substantially inverted U-shaped grip portion 35 is attached above the support substrate 31 of the head and neck support portion 30. The portion for attaching the grip portion 35 to the support substrate 31 gradually widens to secure the attachment strength, but this portion 36
By dividing the grip into two parts, the patient can freely grip either the upper part or the lower part of the grip part 35. Therefore, the grip 35 and the part 3 to which it is attached
6 is used as a grip. Note that the bifurcated portion 36 is not limited to such a shape and may be, for example, a rod-shaped one as long as it can support the gripping portion 35 and can be gripped by the patient. Further, an acrylic piece 37 having the same thickness as that of the substrate 11 is attached to the upper back surface of the support substrate 31 to prevent the head and neck support portion 30 from tilting or wobbling so that the patient's body can be stably held. . Further, the pillow 38 is placed at an appropriate position on the support substrate 31 so that the patient can hold the head and neck in a comfortable posture.

On both sides of the lower side 13 of the substrate 11, the shell 2 is provided.
Fixing plates 14a and 14 for fixing 0 to the substrate 11
b is attached to the substrate 11 via a hinge 15. The fixing plates 14a and 14b of this example are substantially rectangular acrylic plates extending along the side edges of the substrate 11, and the hinge 15 is attached below these fixing plates 14a and 14b as much as possible. Also,
Locking metal fittings 16 that can be locked to the board 11 by pressing the fixing plates 14a and 14b from above are attached to the lower ends of the fixing plates 14a and 14b of the board 11, respectively. Since most of the hinges 15 and the lock fittings 16 that are commercially available are made of metal, the fitting of these fittings below the substrate 11 minimizes the influence on the CT image. Therefore, since the fixing plates 14a and 14b are configured to be fixed mainly from below the substrate 11, it is difficult to uniformly hold down the shell 20 by the entire elongated fixing plates 14a and 14b. Therefore, the rubber plate 1 is provided on the back surface 17 of the fixing plates 14a and 14b facing the substrate 11.
8 is attached so that the end of the shell 20 is pressed as evenly as possible. Instead of the rubber plate, a plate member having high elasticity such as sponge can be used.

The shell 20 is formed by heating a mesh-shaped plate to fit the chest of the patient. An example of the thermoplastic mesh sheet forming the shell 20 is a shell sheet manufactured by Orfit Co. Such a mesh-shaped sheet has a small amount of radiation absorption and a small amount of reduction after being shaped to fit the patient's body, and can be repeatedly worn on the patient's body with minimal burden on the patient. It is a thing. Shell 20 of this example
Is used to secure the patient's chest with the arch 2 of the lower chest.
It is shaped so as to match the shape from 1 to the shoulder 22, and further shaped to cover the front surface 23 to a portion 24 of the back surface of the patient. Therefore, when the cross section of the shell 20 is seen, both sides 25a, 25b of the shell wrap around inward so as to contact a part of the back surface. Further, since both ends 26a and 26b of the shell are extended to the outside so that they can be inserted into the fixing plates 14a and 14b of the substrate 11 and fixed to the substrate 11, the overall cross section is approximately Ω type. Further, since it is necessary to take a posture in which the patient's arm is extended upward when irradiating with radiation, both sides of the shoulder 22 of the shell 20 are molded 27 from the base of the patient's arm slightly along the arm. Further, the chest of the shell 20 is provided with a mark 28 as a target for irradiating radiation, so that the mark need not be directly attached to the patient's body.

Referring to FIG. 2, the chest fixing device 10 of this example.
The manner in which the chest of a patient is fixed by using will be described. First,
The chest fixing device 10 of this example is placed on the bed 1 or the like on which the patient lies when receiving radiation treatment. The head and neck holding unit 30 slidably attached to the substrate 11 is used as a measure 3
4 is used to slide to a predetermined position determined for each patient, and fixed by the metal fitting 33. The patient is laid on his / her back on the substrate 11, and the arm is extended upward in a comfortable posture so that one of the grips 35 and 36, which is substantially determined by the patient, is grasped. Then, the patient's head is pillowed 38
Support by. The grips 35 and 36 are the support substrate 3
The place 36 attached to 1 is also divided into two parts, so that the patient can grasp at any place, so that even a patient who has difficulty raising his arm due to surgery or the like can grasp an appropriate place in a comfortable posture. . Next, shell 2 the patient's chest
0 and cover both ends 26a and 26b of the fixing plate 14
It is fixed to the substrate 11 with a and 14b. Shell 20
From the patient's shoulder 22 and base of the arm 27 to the arch 2
Since it covers up to 1, it is possible to reproducibly fix the body part of the patient, which is important in reproducing the shape of the chest such as the shape of the arm and the inclination of the breast. Therefore, by irradiating radioactive rays toward the mark on the shell 20, the reproducibility of tangential irradiation can be greatly improved and the treatment efficiency can be increased.

Further, as shown in FIG. 3, the shell 2 of this embodiment is used.
Since 0 is molded into a substantially Ω type, both sides 25a of the shell,
b can be wrapped around the back of the patient. Therefore, since the shell 20 of the present example holds the body 2 of the patient lying on the back of the substrate 11 so as to wrap it, it is possible to prevent the body 2 from being twisted and a slight positional deviation relative to the substrate 11.
Moreover, since the patient's chest is sandwiched between the front surface 23 of the shell 20 and both sides 25a, 25b, the front surface 23 of the shell 20 formed to fit the chest is pressed against the patient with an appropriate pressure to shape the patient's chest. be able to. Furthermore, since the shell 20 holds the patient not only from the front of the chest but also from the back, a comfortable fit can be obtained, and the burden and fatigue during treatment can be reduced. Since the shell of this example does not simply press the patient's body against the substrate 11 from the front side, less pressure is applied to the patient's body.

In addition, the chest fixing device of the present example is very reproducible and the posture of the patient can be adjusted by fixing the shell molded according to the patient to the substrate at two places, so that the therapist can very easily perform this. A chest fixation device can be handled. Therefore, when the number of therapists is small, the shape of the chest of the patient can be easily reproduced even by one person, and efficient treatment can be performed.

As described above, by using the chest fixing device of this example, the burden on the patient can be reduced and the reproducibility of tangential irradiation can be improved. Therefore, it is possible to easily improve the treatment efficiency while preventing side effects on the lungs, etc., and shorten the treatment time and reduce the burden on the patient. In addition, the patient can take a comfortable posture such as the position of the arm, and the shell that supports from the back allows the patient to receive treatment while obtaining a comfortable and comfortable fit, thus minimizing fatigue. It is possible to perform stable and highly reliable radiotherapy, because the patient is less likely to move during the irradiation due to fatigue such that the reproducibility of the tangential irradiation is reduced.

Further, since the mark 28 is provided on the shell 20, it is not necessary to provide the mark on the patient's body, and the mental burden on the patient's daily life can be reduced. At the same time, since the mark does not disappear, the burden on the therapist can be reduced and there is an advantage in shortening the treatment time.

Further, the substrate 11 and the fixing plate 14, etc.
The member located near the chest is made of non-metal such as acrylic or wood to prevent the CT image used for treatment planning from being affected. Further, a metal fitting 16 or the like for locking the fixing plate 14 is also attached as far as possible from the chest to minimize the influence on the CT image. Therefore, a highly accurate treatment plan can be easily planned with the chest fixed using the chest fixing device of this example. In this respect as well, by using the chest fixing device of the present example, it is possible to shorten the treatment time and reduce the burden on the patient and the therapist.

[Embodiment 2] FIG. 4 is an exploded view of a chest fixing device according to a different embodiment of the present invention. Further, FIG. 5 shows a state in which these are assembled. Further, in the chest fixing device 10 of this example, the same parts as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The fixing device 10 of this embodiment is provided with an acrylic substrate 11 as in the first embodiment, and is formed with a groove 45 having a slightly wider width in a portion which abuts on the head of a patient. Substrate 11 of this example
Is a relatively wide plate member that can be set on the back from the arch of the patient's bone to the head, and is a groove 45 provided above the plate member 12.
Measure 4 with graduations in the approximate center of the
The mark such as 6 is attached. The groove 45 allows the head / neck holding member 40, which can hold the patient's head and neck, to be slidably fitted therein. Then, by setting the position of the head / neck holding member 40 in accordance with the measure 46, to a predetermined position corresponding to the body of each patient,
The head and neck holding member 40 can be installed with good reproducibility. Also, by preparing several types of head and neck holding members having different heights, the head can be supported at a position that matches the posture of the patient.

On the upper end portion 12 of the substrate 11, a grip portion 50 of this example is attached. The grip portion 50 of the present example includes a wide arch-shaped handle 51, and a short pole 52 that rotatably attaches the handle 51 to the substrate 11. The patient can handle the handle 51 until it can be grasped in its natural position.
You can turn and grab.

Groove 4 for mounting head and neck holding member 40
The base plates 11 on both sides of 5 are provided with metal fittings 60a and 60b for locking the shoulder portion 22 of the shell 20. These metal fittings 60a, 60b are made of acrylic and have a substantially square plate 61 at the portion sandwiching the shell 20, so that the substrate 11 can be sandwiched as wide as possible.

As in the first embodiment, fixing plates 14a and 14b are provided on both sides of the lower side 13 of the substrate 11 of this embodiment, and the lower end of the fixing plates 14a and 14b can be locked by a metal fitting 16. The upper ends 19 of the fixing plates 14a and 14b of this example are the substrate 1
1 extends from the inside to the outside in a curved shape. Therefore, since the fixing plates 14a and 14b can be set along the armpit of the patient, a long range along the base plate 11 of the end portions 26a and 26b of the shell 20 can be fixed as compared with the first embodiment.

Further, the end portion 26a of the shell 20 of this example,
Two holes 75 arranged vertically are provided in the lower part of b. Further, each of the fixing plates 14a and 14b is provided with a hole 72 at a position corresponding to the hole 75 at the end of the shell 20. Then, two protrusions 71 are provided at both ends of the substrate 11 at positions corresponding to the holes 72 provided in the fixing plates 14a and 14b. Therefore, when attaching the shell 20 to the substrate 11,
The hole 57 prepared at the end of the shell 20 is inserted into the protrusion 71 protruding from the substrate 11, and the fixing plate 14a is inserted from above.
The shell 20 can be attached to the substrate 11 so that the position of the shell 20 with respect to the substrate 11 becomes constant by pressing the shell 20 with b.

As shown in FIG. 5, when the apparatus of this example is assembled and the chest of the patient is fixed, first, the head and neck of the patient can be set at a predetermined position with good reproducibility using the head and neck holding member 40. Further, since the shoulder 22 of the shell 20 can be fixed to the substrate 11, the movement of the part of the patient from the shoulder to the arm can be fixed. Further, the shoulder portion 22 of the shell 20
Since it can be molded by turning it to the back side as well as to the side of the chest, it can be reproducibly fixed even when the patient's shoulder is slightly raised from the base plate. Therefore, the patient can be fixed in a natural state in which the patient is less tired. You can also get a fit on the shoulders. Since the handle 51 can be moved over a wide range, the arm extended by the patient guided by the shell 20 can be secured at a position where the burden is small.

When the shell 20 is also attached to the substrate 11 by the fixing plates 14a and 14b, the position of the shell 20 relative to the substrate 11 can be reproduced more accurately than the protrusion 71. Therefore, in addition to being able to accurately reproduce the position of the head and neck holding member 40, it can be set on the substrate 11 so as to more accurately reproduce the shape of the patient's chest.

As described above, the chest fixation device according to the present embodiment is a device that can easily enhance the reproducibility of tangential irradiation with less burden on the patient and the therapist, similarly to the chest fixation device according to the first embodiment. And since the reproducibility of the positions of the shell and the head and neck holding member can be further improved, the efficiency is further improved,
Radiation therapy with less burden on the patient is possible.

The number of holes and protrusions provided in the shell and the fixing plate is not limited to two, and may be one or more. Of course, other than acrylic, the substrate and the fixing plate may be made of non-metal.

[0038]

As described above, the chest fixing device according to the present invention is suitable for tangential irradiation in breast-conserving treatment of breast cancer, and is a fixing device capable of greatly improving reproducibility of tangential irradiation. . Therefore, side effects on the lungs and the like can be prevented, and the treatment efficiency can be improved. Further, the chest fixation device according to the present invention does not employ means for increasing the burden on the patient such as pressing the chest of the patient in order to improve reproducibility. On the other hand, by using a shell to hold the patient in the widest area possible from the chest to the back, the body is restrained from twisting and the fit is increased to reduce fatigue. It is also possible to reduce the burden on the. Further, even a patient who has difficulty in extending his / her arm up due to surgery or the like can ensure a stable posture with a minimal burden. As described above, by using the chest fixing device according to the present invention, the treatment efficiency can be enhanced patient-friendly.

Furthermore, the patient can be easily set on the chest fixing device according to the present invention, and the metal portion can be separated from the chest as much as possible to obtain a clear CT image without causing artifacts. The chest fixing device according to the invention is configured so that the burden on the therapist side can be reduced over the entire radiation treatment from the time of planning the treatment. Further, the chest fixing device according to the present invention has many effects as disclosed above, such as reducing the burden on the patient and the therapist without attaching the irradiation mark to the patient's body.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an outline of a chest fixing device according to a first embodiment of the present invention.

FIG. 2 is an explanatory view showing a state in which a patient is fixed using the chest fixing device shown in FIG.

FIG. 3 is a side view (a) of the chest fixing device shown in FIG. 1 for showing a cross-sectional structure of the shell, and an enlarged view (b) of a portion for fixing the shell.

FIG. 4 is an exploded perspective view showing an outline of a chest fixing device according to a second embodiment of the present invention.

5 is a perspective view showing an assembled state of the chest fixing device shown in FIG. 4. FIG.

[Explanation of symbols]

 1 ... Bed 2 ... Patient's body 10 ... Chest fixing device 11 ... Board 12 ... Above board (the part that touches the patient's head) 13 ... Below board 14 ... Fixing plate 15 ... Hinge 16 ..Locking fittings 17..Back side of fixing plate 18..Rubber plate 20..Shell 21..Shell side of shell 22..Shell shoulder side 25..Shell sides 26..Shell ends 27 ..Part corresponding to arm of shell 28..Mark 30..Head and neck support 31..Support substrate 33..Metal fitting 34 for fixing support substrate..Measure 35, 50..Grip 40 .. Member 51 .. Handle 60 .. Metal fitting for locking the shoulder portion of the shell 75 .. Fixing hole provided at the end of the shell

Claims (5)

[Claims] 1. A heat having a non-metal substrate whose chest can be set on its back and a cross section of approximately Ω shaped to fit the rib arch from at least the shoulder including the chest of each person lying on its back. A plastic shell, position adjusting means capable of adjusting the position of each person's head and neck with respect to the chest held by the shell, and at least a part of both side ends of the shell are sandwiched and fixed along the substrate. A chest fixing device for radioactive therapy, which is made of metal and has an elongated fixing means. 2. The chest fixing device for radiotherapy according to claim 1, wherein the position adjusting means is a grip that is slidable along the substrate and can be grasped in a state of being laid on its back on the substrate. 3. The radiotherapy chest fixing device according to claim 1, wherein the position adjusting means is a head and neck holding means slidable along the substrate. 4. The chest for radiotherapy treatment according to claim 1, wherein at least one hole is provided at both ends of the shell, and the fixing means has a protrusion capable of penetrating the hole. apparatus. 5. The method according to any one of claims 1 to 4,
The fixing means includes a non-metal plate and a metal fixing bracket that fixes the end of the plate away from the chest to the substrate, and has an elastic member between the plate and the substrate. A chest fixing device for radiation therapy, which is characterized in that: