Radiation therapy system

Abstract

The invention provides a radiation therapy system which comprises a radiation source, a bracket, two X-ray bulb tubes, two detectors, a couch and a top plate. The top plate is fixedly connected with a ceiling and is provided with a circular guide groove A. The upper part of the bracket is connected with the inside circular guide groove A through a slider, and can rotate along the circular guide groove A. The bracket is provided with an arc-shaped guide groove A with a downward opening. The system further comprises a telescopic device. The upper end of the telescopic device is connected with the inside arc-shaped guide groove A. The lower end is fixedly connected with a radiation source. The X-ray bulb tubes are fixedly connected with the bracket and can rotate with the bracket. Two X-ray bulb tubes and a radiation therapy isocenter are in the same vertical plane. The detectors are located underneath the couch, and can synchronously rotate on a horizontal plane with the rotation of the X-ray bulb tubes. The radiation therapy system provided by the invention has the advantages of simple structure, easy control, wide range of non-coplanar radiation therapy and small radiation attenuation. Rays emitted by an image guide device are not blocked.

Description

technical field [0001] The invention relates to a radiotherapy medical device, in particular to a radiotherapy system. Background technique [0002] The latest data show that cancer has been called a major killer of human health. Radiation therapy (hereinafter referred to as radiotherapy), as an important means of treating cancer, has been developed continuously and rapidly, and various radiotherapy equipments have appeared accordingly. However, most of the current radiotherapy equipment has defects such as complex structure and small range of non-coplanar radiotherapy. [0003] The Cyberknife system developed by Accurary Corporation of the United States is a major advancement in radiotherapy equipment. The system uses two sets of X-ray tubes and detectors to form an image guidance device to obtain the position of the target area, so as to track the target area during radiotherapy. The electronic linear accelerator is installed on the manipulator, and the manipulator drive...

AI Technical Summary

Problems solved by technology

The shortcomings of the Cyberknife system are: 1. The X-ray tube is fixed on the ceiling. During radiotherapy, the manipulator and accelerator will block the rays emitted by the image guidance device, which will affect imaging and tracking; 2. The system cannot monitor the target area. Rotating drawn arc radiotherapy, the efficiency of radiotherapy needs to be improved. 3. The system uses manipulators, because the manipulators are multi-stage joints connected in series and have a cantilever structure. The current manipulators can only grab X-band electron linear accelerators of about 200kg at most, and the weight is up to The 400kg C-band electron linear accelerator is powerless, and the C-band electron linear accelerator has the advantages of good stability, easy processing of the accelerating tube, and low cost, and has been developed rapidly.

This method solves the problem that the X-rays emitted by the image guidance device are blocked. However, this is at the expense of the radiation incident range of non-coplanar radiotherapy, because this structure is different when the imaging system and the radiation source rotate. The trajectory essentially forms a cylindrical surface. If the angle of revolution is too large, there will be problems of interference between the imaging system and the ray source and the treatment bed

[0005] The application number is 95102563.5 Chinese authorized patent discloses a stereotactic radiotherapy device, the device includes a treatment head and a moving frame, and the moving frame includes a sequentially connected vertical telescopic mechanism, a vertical rotary mechanism, a horizontal moving guide mechanism and a horizontal fixed guide Composed of mechanisms, the device has the advantages of simple structure and convenient control. The disadvantages are: 1. It is impossible to perform rotating arc radiotherapy on the target area, and the radiotherapy efficiency is not high; 2. Multiple mechanisms are connected in sequence, which will cause the error of the mechanism to accumulate. The mechanical error of the whole device is relatively large; 3. The radiotherapy device does not have an image-guided device, so IGRT (image-guided radiotherapy) cannot be implemented, resulting in low radiotherapy accuracy

However, the distance from the ray source to the lesion in the current radiotherapy equipment is fixed, which will reduce the intensity of the ray after reaching the lesion. At the same time, the ray will collide with the air after leaving the ray source and scatter, resulting in damage to normal tissue damage

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