JPH02228973A - Radiation treatment apparatus - Google Patents

Abstract

PURPOSE:To perform opposed two-gate irradiation at the same time by a single radiation treatment apparatus and to also perform opposed tow-gate irradiation, multiple-gate irradiation and revolving irradiation at the same time by a different kind of rays and different energies by mounting the first and second gantries supported in opposed relation to each other by a stand so as to hold an isocenter between the two. CONSTITUTION:An electron beam scattering body 15 is inserted in place of a target 3 at the time of electronic treatment and an X-ray flat filter 4 is removed. A dose monitor 5 measures the intensity of X-rays or that of electron beam. A pair of collimator upper blocks and a pair of collimator lower blocks determine the radiation field dimension of an isocenter 19. An ion pump 10 forms a high electric field in an electron gun 1 or an acceleration tube 2. A stand 12 receives various power supplies of a pulse modulator or the like. By this method, opposed two-gate irradiation by the combination of different energies of a different kind of rays (X-rays or electron beam) or the same of rays can be performed with respect to a central part by the first and second gantries 8A1, 8A2.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a radiation therapy device, and more specifically, an electron linear accelerator for treating malignant tumors using radiation such as X-rays and electron beams. The present invention relates to a radiation therapy device consisting of the following.

[Prior art] Figure 3 is from "Accelerator Science" Volume 1, No. 1 (1984,
April) This is a radiation therapy device consisting of a conventional small electron linear accelerator described on pages 29-39. A flattening filter (4), a dose monitor (5), a pair of collimator upper blocks (6), a pair of collimator lower blocks (7a) (7b), etc. are included in the gantry (radiation generating part).
(8B). (9) is the gantry (8B)
isocenter, which means the center of rotation of The ion bomb (10) is for maintaining the electron gun (1) and the acceleration tube (2) in a vacuum. (11) is a magnetron. Various power sources are housed in the stand (12).

(16) is the counter waist.

FIG. 4 shows a radiation therapy apparatus consisting of a conventional large-scale electron linear accelerator described in the above-mentioned document, and a stand (12
) is installed the Talaistron (13). The gantry (8A) is provided with a deflection magnet (14) at the exit of the acceleration tube (2). (15) is an electron beam scatterer, which has a structure that replaces the target (3).

The same reference numerals as in FIG. 3 indicate the same or corresponding parts of the pond.

Next, the operation of the one shown in FIG. 3 will be explained. A compact electron linear accelerator is a radiation therapy device that accelerates electrons to the speed of light using a microwave electric field to generate high-energy X-rays, thereby treating malignant tumors. A small electron linear accelerator is a dedicated X-ray machine that generates HIV X-rays or LMV X-rays. The electrons generated in the electron gun (1) are transferred to the acceleration tube (2).
) is accelerated by the electric field of the microwave, and the target (3
).

X-rays are generated from this target (3). The X-rays generated at this time have strong directivity toward the front. Therefore, in order to flatten this, an X-ray flattening filter (
4) is used. The dose monitor (5) is for measuring X-ray intensity.

A pair of collimator upper blocks (6) and a pair of collimator lower blocks (7a) (7b) are connected to a gantry (8B).
This is to determine the size of the irradiation field at the isocenter (9), which is the center of rotation. The ion pump (lO) is a vacuum pump for maintaining vacuum in the electron gun (1), acceleration tube (2), etc. The magnetron (11) is a high power microwave generator for creating a high electric field in the accelerator tube (2).

The gantry (8B) has the above codes (1) to (7), (1
0) and (11) are mounted on the rotating pedestal. The counterweight (16) is attached to the gantry (8
B) and are installed to balance the rotation. The stand (12) houses 74 different sources such as pulse modulators. The gantry (8B) rotates, but the stand (
12) is fixed.

During radiotherapy, the patient's affected area is set at the isocenter (9), and the Gantt U (8B) is set at an arbitrary angle or rotated to irradiate X-rays.

Similarly, the operation of the one shown in FIG. 4 will be explained.

A large electron linear accelerator is a radiation therapy device that accelerates electrons to the speed of light using a microwave electric field to generate high-energy X-rays and electron beams, thereby treating malignant tumors. While a small electron linear accelerator is a dedicated machine for X-ray therapy, a large electron linear accelerator is a machine that uses both X-rays and electron beams. The X-ray energy used is mainly 4MV, 6MV or 1OMv, but recently there are also models with two-stage X-ray switching. The electron beam energy is usually switched in several stages from 4 MeV to 20 MeV. The electrons generated in the electron gun (1) are transferred to the acceleration tube (2).
), the beam is accelerated by the electric field of the microwave, then deflected by the deflection magnet (14) and incident on the target (3). X-rays are generated from this target (3). The X-rays generated at this time have strong directivity toward the front. Therefore, an X-ray flattening filter (4) is used to flatten this. During electron beam therapy, the target (3
), an electron scatterer (15) is inserted, and the X-ray flattening filter (4) is removed. The dose monitor (5) measures X-ray intensity or electron beam intensity. A pair of collimator upper blocks (6) and a pair of collimator lower blocks (7)
a) (7b) determine the irradiation field size at the isocenter (9), which is the center of rotation of the gantry (8A). The ion pump (lO) is a vacuum pump for maintaining vacuum in the electron gun (1), acceleration tube (2), etc. Talaistron (13)
) is a high power microwave amplifier for applying a high electric field to the accelerator tube (2).The gantry (8A) has the above code (1).
)~(7), (1,0), (11), (14),
This is a rotating pedestal on which the part shown in (15) is mounted. The counterweight (16) balances the rotation with the country (8A). The stand (12) houses various power supplies such as a pulse modulator. The gantry (8^) rotates, but the stand (12) is fixed.

[Problems to be Solved by the Invention] Conventional radiation therapy equipment is configured as described above, so when performing two facing irradiation (irradiation from above and below or from the left and right) or multi-field irradiation, the gantry must be moved for the number of times of irradiation. There must be. Furthermore, it was not possible to simultaneously treat patients with different types of radiation (X-rays or electron beams) or with different energies using a single radiation therapy device.

This invention was made to solve the above-mentioned problems, and it is possible to simultaneously irradiate two opposing beams with a single radiation therapy device, and simultaneously irradiate two opposing beams with different radiation types and different energies. The purpose of this invention is to obtain a radiation therapy device that can perform multifield irradiation and rotational irradiation.

[Means for Solving the Problems 1] In the radiation therapy apparatus according to the present invention, a second gantry is disposed at a position facing the first gantry.

In order to widen the treatment range, it is conceivable to use a large-sized electron linear accelerator as the first gantry, and use the same or a small-sized electron linear accelerator as the first gantry as the second gantry.

[Function] In this invention, the gantry faces 2f[i! 1
Therefore, a single radiotherapy device can perform irradiation with two opposing fields at the same time, as well as irradiate two facing fields with different radiation types and energies, multi-field irradiation, and roughly rotational irradiation.

[Embodiment 1] Figure 1 shows an embodiment of the present invention, in which one stand (
12) in common and the first one across the isocenter (9). A second gantry (radiation generating unit) (8A, ) and (8A*) are rotatably mounted and disposed facing each other. Gantry (8^1) and (8Ax) are similar to the gantry (8^) shown in FIG. However, a counterweight is not required.

In addition, the same reference numerals as in FIG. 4 indicate the same or corresponding parts.

Next, the operation will be explained. A large electron linear accelerator is a machine that uses both X-rays and electron beams, and the electron beam energy can be switched in several stages, making it possible to perform radiotherapy over a wide range of areas.

The electrons generated by the electron gun (1) are accelerated by the electric field of the microwave in the acceleration tube (2), and then deflected by the deflection magnet (14).
) and enters the target (3). X-rays with strong forward direction are generated from this target (3). Therefore, an X-ray flattening filter (4) is used to flatten this. During electron beam therapy, an electron beam scatterer (15) is inserted in place of the target y+- (3), and the X-ray flattening filter (4) is removed. The dose monitor (5) measures X-ray intensity or electron beam intensity. A pair of upper collimator blocks (6) and a pair of lower collimator blocks (7a, 7b) determine the field size at the isocenter (9). The ion pump (10) is the electron gun (1)
A high electric field is applied to the accelerating tube (2).The stand (12) houses various power supplies such as a pulse modulator.

With the above configuration, the first gantry (1!A, ) and the second gantry (8At) have different lines F! with respect to the center. (X-rays or electron beams), it is possible to irradiate two opposing beams by combining different energies of the same radiation type. For example, a combination such as 6 MV X-rays from the first gun (8^1) and 20 MeV electron beams from the second gun (8^ha) is possible. Because it can be done simultaneously, the treatment time for the same purpose is 172 times longer than before.
become.

FIG. 2 shows another embodiment. This is the first Gantt'J
(8A) or the second Gantt 1.1 with a large electron linear accelerator
(8B) is a combination of small electron linear accelerators. The same reference numerals as in FIGS. 3 and 4 indicate the same or corresponding parts of the pond.

The above configuration produces the same effect as the one in Figure 1, but the small electronic linear acceleration 1g (8B) is for an AMV X-ray dedicated machine and emits only one type of radiation, and the embodiment in Figure 1 The treatment range is narrower compared to

[Effects of the Invention] As described above, according to the present invention, the second gantry is mounted opposite to the first gantry, and both are structurally inclined, so that the structure is simple and the device is easy to use. can be done at low cost and can provide highly accurate radiation therapy in a short time.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of one embodiment of the present invention, FIG. 2 is a side sectional view of another embodiment, and FIGS. 3 and 4 are side sectional views of a conventional radiation therapy apparatus. (1) Electron gun, (2) Accelerator tube, (3) Target, (4) X-ray flattening filter, (5) Dose monitor, (6) Collimator upper part, (7a
)(7b)...Collimator lower block, (8^)(8
B) (8^1) (8A2)... Gantry, (9)... Isocenter, (11)... Magnetron, (12)...
Stand, (13)... Talaistron, (14)...
Deflection magnet, (15)...electron beam scatterer. In each figure, the same reference numerals indicate the same or corresponding parts. Figures 8A1, 8A2: 9: 12: Gantry Isosenfusgund Figure

Claims (1)

[Scope of Claim] A radiation therapy apparatus in which a gantry, which is a radiation generating section, is rotatably provided, comprising: a fixed stand; and a second stand supported by the stand and facing each other across an isocenter. 1. A radiation therapy apparatus comprising: the second gantry;