JPH07250910A - Radiation treatment device - Google Patents

Abstract

PURPOSE:To prevent restriction on the rotating range of a gantry by providing this gantry with a supporting section which is fixed to the rotation supporting shaft of the gantry without being displaced in spite of rotation of the gantry and regulates the displacement of a top plate in the gravity direction at the free end of a top plate. CONSTITUTION:The top plate 7 is provided with a top plate supporting arm 15 for regulating the displacement of the free end generated by placement of a body to be treated on the top plate 7. This supporting arm 15 is supported to the rotation supporting shaft of the gantry 1 to the supporting stand 3. The support is not affected at all by rotation of the gantry 1. Namely, the rotation supporting shaft is provided with the surface base 13 which is held static without rotation even during rotation of the gantry 1. The top plate supporting arm 15 is mounted at this supporting base 13. The top plate supporting arm 15 supports the free end of the top plate 7 via a turn table 16. The top plate 7 is rotated independently around an iso-center to the top plate supporting arm 15 by this turn table 1b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiotherapy apparatus, and more particularly to a so-called stereotactic radiotherapy apparatus.

[0002]

2. Description of the Related Art A so-called stereotactic radiotherapy apparatus is an apparatus for irradiating a lesion of a patient with beam-like radiation from various directions for treatment.

In this apparatus, the radiation is concentratedly applied only to the lesion, and the irradiation can be suppressed to such an extent that it does not harm the organs and the like around it.

As described above, since the focus is irradiated with radiation in a concentrated manner, it is necessary to position the patient so that the focus can be positioned at an accurate position with respect to the irradiation of radiation.

In such a radiotherapy apparatus, the patient is placed with its lesion located at the isocenter, which is the intersection of the extension line of the rotary support shaft of the gantry that is rotationally driven and the radiation emitted from this gantry. It has become.

Thus, by rotating the gantry, the radiation emitted from the gantry is directed to the lesion located at the isocenter while changing its direction.

Furthermore, in order to widen the range of change in the direction of radiation with respect to the lesion, the mounting table on which the patient is mounted is
It can rotate in a horizontal plane about the isocenter.

For this reason, the top plate that directly reclines the patient is
It is arranged so as to extend to the isocenter side from a mounting table that moves along a circle centered on the isocenter, and is in a so-called cantilevered state with respect to the mounting table.

However, in the radiotherapy apparatus thus constructed, as described above, the top plate of the mounting table has a free end because it is cantilevered, and this free end lies on the side of the patient. It was pointed out that it would be displaced in the direction of gravity.

For this reason, for example, when there is a lesion on the head of the patient, a head support provided independently of the top plate is provided, and the lesion is accurately located in the isocenter by this head support. It has been known that a collimator for localization method of a radiation irradiation port is also supported by a support in order to fix the position of the isocenter with high accuracy (Japanese Patent Publication No. 2-503521). .

[0011]

However, in the radiation treatment apparatus described in Japanese Patent Publication No. 2-350321, the support table for supporting the top plate and the collimator for localization method is mounted on the floor. Since it is fixed, its support stand interferes with the rotation of the gantry,
The problem remains that the rotation range of the gantry is narrowed.

Further, the top plate is still deflected by the gravity of the patient, and even if only the head is fixed by the head support, the positional displacement of the patient's body due to the deflection of the top plate is also affected by the head. However, there remains a problem that the lesion is misaligned with respect to the isocenter.

Therefore, the present invention has been made under such circumstances, and an object of the present invention is to provide a radiotherapy apparatus in which the rotation range of the gantry is not restricted at all.

Another object of the present invention is to provide a radiotherapy apparatus which does not cause misalignment of the lesion site with respect to the isocenter.

[0015]

In order to achieve such an object, the present invention is configured by the following means.

Means 1 A gantry having a radiation irradiation port and capable of being driven to rotate, and a treatment site of the patient are positioned at an isocenter, which is an intersection of the extended line of the rotation support shaft of the gantry and the emitted radiation. In a radiotherapy apparatus that cantileverly supports a top plate that directly reclines the patient, the mounting table can be displaced with respect to the rotation support shaft of the gantry regardless of rotation of the gantry. It is characterized in that it is provided with a support member which is fixed without restricting the displacement of the free end of the top plate in the direction of gravity.

Means 2 A gantry having a radiation irradiation port and capable of being rotated, and a treatment site of the patient are placed at an isocenter, which is an intersection of the extended line of the rotation support shaft of the gantry and the emitted radiation. In a radiotherapy apparatus that cantileverly supports a top plate for directly lying down the patient, the mount table is fixed to the gantry and the free end of the top plate is displaced in the direction of gravity. And a support member for restricting the gantry. The support member includes a member fixed to the gantry and a member supporting the top plate, and each of these members is provided on an extension line of the rotation support shaft of the gantry. It is characterized in that they are connected via a rotary shaft.

[0018]

According to the radiation treatment apparatus having the structure of the means 1, since the supporting member is structured to support the free end of the top plate, the lesion of the patient fixed to the top plate is displaced in its position. Can be positioned at the isocenter without causing the displacement, and the misalignment from the isocenter can be eliminated.

Further, since the support member for supporting the top plate is fixed to the rotation support shaft of the gantry and is attached so as not to be displaced despite the rotation of the gantry, the rotation of the gantry is performed by this support member. Will never be disturbed. Therefore, the rotation range of the gantry is not restricted as in the conventional case.

The radiation treatment apparatus having the construction of the means 2 also prevents the displacement of the lesion of the patient due to the above-mentioned reasons.

Since the support member is fixed to the gantry, the support member does not hinder the rotation of the gantry. In this case, in order to prevent the portion of the support member that supports the top plate from cooperating with the rotation of the gantry, the extension line of the gantry rotation support shaft is provided between the gantry and the fixed portion. It is connected via a rotating shaft.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the radiation treatment apparatus according to the present invention will be described below with reference to the drawings.

Embodiment 1 As shown in FIG. 1, there is a support base 3 fixed to the floor,
The gantry 1 is supported on the support base 3. The gantry 1 is rotatable with respect to the support base 3, and radiation from a radiation generating source (not shown) incorporated therein is emitted in the form of a beam from an irradiation head 2.

Despite the rotation of the gantry 1, the radiation from the irradiation head 2 can always pass through a point on the extension line of the rotation axis with respect to the support base 3, which is called the so-called isocenter. The affected part of the treatment body (patient) is located at the position.

On the other hand, a turntable 21 is embedded in the floor surface, and its central axis is located at a perpendicular line passing through the isocenter.

The treatment table base 5 is fixed to the turntable 21,
The treatment table base 5 is guided by the turntable 21 and can move on a circle on the floor centering on the central axis of the turntable 21. In this case, the treatment table substrate 5 has a top plate 7 arranged on the upper surface thereof so as to extend to the isocenter side, and can move without changing the directing direction of the top plate 7 toward the isocenter side. .

As a result, the top plate 7 is supported by the treatment table substrate 5 in a cantilever manner and has a free end on the isocenter side.

The body 4 to be treated is placed on the top plate 7 and, as described above, the affected part is arranged so as to be positioned at the isocenter.

The head of the body to be treated 4 is fixed by a fixing device 10 fixed to the top plate 7 so that the affected area is not misaligned.

By being configured in this way,
Radiation from the irradiation head 2 of the gantry 1 is applied only to the affected part of the body to be treated 4 positioned at the isocenter, and its irradiation direction is rotated with respect to the support base 3 of the gantry 1 or moved relative to the floor of the treatment base 5. It is possible to change variously according to.

In this embodiment, in particular, a top support arm 15 for restricting the displacement of the free end in the direction of gravity caused by the placement of the subject to be treated is provided.

The top plate support arm 15 is supported on a rotary support shaft for the support base 3 of the gantry 1, and this support is not affected by the rotation of the gantry 1. In other words, the top plate support arm 15
Is not displaced with respect to the floor surface regardless of the rotation of the gantry 1.

In this embodiment, the gantry 1 is attached to the rotary support shaft.
It also has a support base 13 that does not rotate itself during rotation of the above and is stationary, and the top plate support arm 15 is attached to this support base.

The top plate supporting arm 15 supports the free end of the top plate 7 from the floor side via a rotary table 16, and the rotary table 16 causes the top plate 7 to move to the top plate supporting arm 15. On the other hand, it can rotate independently around the isocenter.

In this embodiment, the top plate support arm 1
The top support arm 15 is provided with a support base 13 so that the displacement of the top 7 toward the gravitational side can be corrected in an appropriate state by means of 5.
The height can be adjusted by a height adjusting mechanism 14 provided between the two.

The height adjusting mechanism 14 is constructed such that the top plate supporting arm 15 can be vertically moved along a guide rail provided on the supporting base 13 and can be fixed at a predetermined position.

Further, since the height of the top plate can be adjusted by the height adjusting mechanism 14, unnecessary stress is prevented from being generated in the top plate. Alternatively, a connecting portion 12 including a spring or the like is provided.

The connecting portion 12 also has an effect that the top plate can be smoothly rotated with respect to the top plate supporting arm.

Embodiment 2 In FIG. 2, the same reference numerals as those in FIG. 1 have the same structure as that in FIG. The configuration different from that of FIG.
5 is supported on the gantry 1.

That is, the top plate supporting arm 15 is provided on a member fixed at a position adjacent to the irradiation head 2 of the gantry 1 via the rotary table 13. The rotary table 13 is arranged such that its central axis is located at an extension line of the rotary support shaft with respect to the support base 3 of the gantry 1.

With the rotary table 13, the top plate supporting arm 15 on the side supporting the top plate 7 can be held in a state of not being displaced with respect to the floor surface even if the gantry 1 is rotated.

In this embodiment as well, as in the first embodiment, the height adjusting mechanism 14 for adjusting the height of the top supporting arm is provided on the side of the rotary table 13 which supports the top. There is.

Embodiment 3 FIG. 3 is a block diagram showing another embodiment of the radiotherapy apparatus according to the present invention.

In the figure, those having the same reference numerals as those in FIG. 1 have the same structure. The part different from FIG. 1 is the mounting structure of the top plate support arm 15, and the shaft 18 which is rotatably supported with respect to the support base 3 of the gantry 1 projects from the gantry 1 to the top plate side. The shaft 18 is fixed to the support base 3 in a state where it does not rotate despite the rotation of the gantry 1.

The top plate supporting arm 15 is attached via the height adjusting mechanism 14.

Embodiment 4 FIG. 4 is a block diagram showing another embodiment of the radiotherapy apparatus according to the present invention.

This drawing is obtained by further improving the structure shown in FIG. 2, for example, and in particular, the localization method collimator 19 attached to the irradiation head 2 can be accurately positioned according to the position of the top plate 7. It is equipped with a mechanism.

That is, the support arm 20 is extended from the portion of the top plate support arm 15 fixed to the gantry 1 side,
The localization method collimator 19 is supported by this extending portion.

The localization method collimator 19 is inserted into the collimator coupling 22 shown in FIG. 5, and the central axis of the collimator coupling 22 can be freely curved. Therefore, the pointing direction of the localization method collimator 19 can be arbitrarily changed by finely moving the support arm 20 that directly supports the collimator coupling 22, and the radiation irradiation direction can be changed. It becomes possible to adjust so as to exactly match the lesions of No. 4.

FIG. 5 is an external view of the collimator coupling 22. A spiral groove 22A is formed on the surface of the collimator coupling 22 so that it can be curved.

According to the radiotherapy apparatus described above, since the support member is configured to support the free end of the top plate, the lesion area of the patient fixed to the top plate is displaced. In addition, it can be positioned at the isocenter and the misalignment from the isocenter can be eliminated.

Further, since the support member for supporting the top plate is fixed to the rotation support shaft of the gantry and is attached so as not to be displaced despite the rotation of the gantry, the rotation of the gantry is performed by this support member. Will never be disturbed. Therefore, the rotation range of the gantry is not restricted as in the conventional case.

[0053]

As is apparent from the above description,
According to the radiotherapy apparatus according to the present invention, it is possible to eliminate the misalignment of the lesion with respect to the isocenter without restricting the rotation range of the gantry at all.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a radiotherapy apparatus according to the present invention.

FIG. 2 is a configuration diagram showing another embodiment of the radiotherapy apparatus according to the present invention.

FIG. 3 is a configuration diagram showing another embodiment of the radiotherapy apparatus according to the present invention.

FIG. 4 is a configuration diagram showing another embodiment of the radiotherapy apparatus according to the present invention.

5 is a perspective view showing an embodiment of a collimator coupling used in the radiotherapy apparatus shown in FIG.

[Explanation of symbols] 1 gantry 4 treated body 7 top plate 15 top plate support arm

Claims (2)

[Claims] 1. A gantry equipped with a radiation irradiation port and capable of being driven to rotate, and a treatment site of the patient is placed at an isocenter, which is an intersection of an extension line of a rotation support shaft of the gantry and irradiation radiation, and the patient is placed on the isocenter. And a mounting table that
In this radiotherapy apparatus, which is cantilever-supported with a top plate for directly lying down the patient, the mounting table is fixed to the rotation support shaft of the gantry without being displaced despite the rotation of the gantry, and A radiation treatment apparatus comprising: a support member that restricts displacement of a free end of the top plate in the direction of gravity. 2. A gantry having a radiation irradiation port and capable of being driven to rotate, and a treatment site of the patient is placed at an isocenter which is an intersection of an extension line of a rotation support shaft of the gantry and the irradiation radiation, and the patient is placed on the isocenter. And a mounting table that
In this radiotherapy apparatus, which is cantilever-supported with a top plate for directly lying down the patient, the mounting table includes a support member that is fixed to the gantry and restricts displacement of a free end of the top plate in the direction of gravity. The support member includes a member fixed to the gantry and a member supporting the top plate, and these members are connected to each other via a rotary shaft provided in an extension line of the rotary support shaft of the gantry. The radiation treatment apparatus characterized by the following.