JPS63315072A - Radiotherapy apparatus - Google Patents

Abstract

PURPOSE:To obtain the effect capable of realizing radiotherapy of every kind by one apparatus, by generating both of electron beam of relatively low energy and electron beam of relatively high energy. CONSTITUTION:The pulse generated from a pulse source 16 is sent to either one of a pulse transformer 14 and a pulse transformer 17 by a pulse change-over device 15. When the pulse is sent to the pulse transformer 14, electron beam is generated from the second electron gun 13 to be driven in an X-ray target 9. Since this electron beam is not accelerated by an accelerator, it is low energy one. The low energy X-rays generated by this low energy electron beam are allowed to irradiate the affected part while filtered by a filter 111. The high energy electron beam generated by the first electron gun 1 and an acceleration tube 3 is deflected by a deflecting electromagnet 8 to irradiate the target 9 and high energy X-rays are generated. In this case, the high energy electron beam is incident to the target 9 in an oblique direction but generates X-rays equivalently same to that in the case vertically incident to a target having the same thickness as that looked in said oblique incident direction.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a radiation therapy device.

[Conventional technology FIG. 2 is a configuration diagram of a conventional radiation therapy apparatus.

(1) is an electron gun, (2) is an electron beam, (3) is an acceleration tube, (
4) is a microwave source, (5) Vi length-curator, (6
) is a four-wave tube, (η is a vacuum duct), (8) is a bending electromagnet, (9) is a target, (10) tf X-ray - (1
1) ti 7 rough) nin9”7 (lul, (12
) d collimator block.

The electron beam (2) generated by the electron gun (1) is generated by the microwave source (4) and sent to the circulator (5) and calyx wave tube (6).
It is accelerated by an electromagnetic field induced in the acceleration tube (3) by the microwaves supplied to the acceleration tube (3) through the .

Accelerated electron, IJ! (2) It is deflected by the deflecting electromagnet (3) through the #i vacuum duct (7), and the X-ray target (9
).

It is converted into an electron beam FiX ray (10) that is emitted by the X-ray target. The generated X-rays (1G) are flattened by a Fi7 rattling filter (IL) and sent to a collimator block (
12) narrows down the irradiation field to the necessary one and provides it for X-ray treatment.

In addition, prior to the X-ray treatment, linac photography Fi is performed to confirm the position of the affected area and the shape of the irradiation field, and a photograph is taken under the same conditions as the X-ray treatment.

[Problem to be Solved by the Invention J] Since the conventional apparatus is configured as described above, it has been difficult to combine various types of radiotherapy in one apparatus. For example, because the energy of X-rays cannot be significantly reduced, the contrast of linac photography is poor, making it difficult to determine the relationship between the shape of the irradiation field and the affected area, and to identify important organs.

This invention Fi was made to solve the above problems, and it is equipped with a separate device that can generate relatively low-energy electron beams, generates low-energy X-rays, and can generate various types of radiation with one device. The purpose is to enable treatment,
Ru.

cMeans for Solving Problems J This invention provides an electron gun that generates low-energy electron beams so that the low-energy X-rays can irradiate the same target as the high-energy X-rays.

[Effect J: In the case of low-energy XaFi due to this emitted qK, the rate of absorption by one human body increases,
A clear projected image is formed on the film.

[Embodiments of the Invention] Fig. 1 shows radiation therapy'! according to the present invention. It is a block diagram which shows one Example of tc direct. (13) is a second electron gun that generates a low-energy electron beam, (14) is a pulse transformer that is the power source for the second electron gun (13), (16) is a pulse source, and (15) #i pulse switching (17) H is the pulse transformer of the first electron gun (1).

The pulses generated by the pulse source (16) are transferred to the pulse switch (1
5), pulse transformer (14), lt pulse transformer (
17). When the pulse is sent to the pulse transformer (14), an electron beam is generated from the second electron gun (13) and is shot into the X-ray target (9). This electron beam has low energy because it is not accelerated by an accelerator. Therefore, the X-rays generated by this low-energy electron beam have low energy. Second electron gun (1
The electron beam from 3) is obliquely shot into the target (9), and X-rays are generated in the direction of reflection. In the case of a high-energy electron beam, when the beam is struck perpendicular to the target, the maximum intensity of X-rays is generated in the direction of its transmission, whereas in the case of a low-energy electron beam, when it is struck perpendicularly to the target, the maximum intensity of X-rays is generated in the direction of its transmission. The X-ray intensity F1 becomes weaker. Rather, the intensity of the X-rays generated from the oblique direction to the direction of impact and reflection from the target is greater. For the above reasons, the low-energy electron beam is obliquely implanted into the target (9). In this way, the low energy X @ that does not occur is filtered (ill)
is filtered and irradiated to the affected area. For low-energy X-rays, the 7-rattoning filter (11) for flattening is unnecessary, so the filter (Ill) is removed.
This removes very low energy X-rays.

The high-energy electron beam generated by the first electron gun (1) and acceleration tube (3) is deflected by a deflection electromagnet (8),
The target (9) is irradiated to generate high-energy X-rays. In this case, the high-energy electron beam
9), but the X-rays are incident perpendicularly to a target having the same thickness as seen in the direction of incidence, generating equivalently the same X-rays as in the hypothetical case.

When performing litikography, use a pulse exchanger (1
5) #-i, switched to excite the second electron gun (13); Using low-energy X-rays generated by the low-energy electron beam generated by the second electron gun (13), linac photography is performed to determine the shape of the irradiation field and the positional relationship of the affected area, and to confirm important organs. Since low-energy X-rays are used, quinacography with good contrast can be obtained.

In a place where high-energy X-rays and low-energy X-rays are used in combination to perform radiation therapy over a wide range of energies, the pulse converter (15) is switched to the first electron gun (1) side and the high-energy X-rays are is switched to the second electron gun (13) to generate low energy X-rays.

When performing high-energy X-ray treatment, pulse t/
This is done by replacing the converter (15) with the first electron gun (1) and generating high-energy X-rays.

In the embodiment shown in FIG. 1, the electron beam is deflected by an electromagnet, but a permanent magnet may be used as long as the necessary deflection can be obtained, and the deflection is not necessarily limited to an electromagnet.

Also, in Figure 1, one pulse source (16) is replaced with two electron guns (IL (13)); (1), (1
It may be used exclusively for 3). Furthermore, a short acceleration tube may be provided to accelerate the electron beam generated by the second electron gun (13).

This accelerator tube (3
) must be shorter than

As described above, according to the radiation therapy apparatus shown in Fig. 1, (1) radiotherapy using high-energy X-rays, (2) linacgraphy using low-energy X-rays, and (3) a combination of high-energy X-rays and low-energy X-rays are used. Both radiotherapy and radiotherapy can now be performed with one device. Moreover, the above (υ~(3)) can be realized under the geometric condition of j-1.

[Young fruit of invention]

This invention is designed to generate both relatively low-energy electron beams and relatively high-energy electron beams, so it is possible to perform various types of radiotherapy with one device.

[Brief explanation of drawings]

Section @1 is a block diagram showing an embodiment of the radiation therapy apparatus according to the present invention, and FIG. 2 is a block diagram of a conventional radiation therapy apparatus. In the figure, (1) is @l's electron gun, (Shu is electron beam, (
3) is an accelerating tube, (4) is a microphone A-wave source, (8) is a bending electromagnet, (9) is an X-ray target, (10) is an X-ray,
(11) is a 7-rattoning filter, (12) is a collimator block, (13) #-1 second electron gun,
(14) + (17) IIi pulse transformer,
(15) #-j pulse switch; (16) is a pulse source; (ill) is a filter. The same reference numerals 8Fi in each figure indicate the same or equivalent parts.

Claims (2)

[Claims] (1) An acceleration tube that accelerates the electron beam generated by the first electron gun into a high-energy electron beam, and a deflection magnet that deflects the high-energy electron beam and irradiates the X-ray target to generate high-energy X-rays. and a second electron gun that irradiates the X-ray target with a low-energy electron beam to generate low-energy X-rays. (2) The radiation therapy apparatus according to claim 1, wherein the low-energy electron beam is obliquely incident on the X-ray target, and the resulting X-rays are generated in the reflected direction.