Method and device for tumor treatment by using rotary scanning magnet to diffuse proton beam

Abstract

The invention relates to a method and a device for tumor treatment by using a rotary scanning magnet to diffuse a proton beam. The method comprises the steps as follows: firstly, converging a divergent proton beam (10) through a focusing element (1); secondly, diffusing the converged proton beam (10) through a rotary scanning magnet (3), and making the diffused proton beam rotate periodically about the proton center to form a large-range uniform beam (11); and thirdly, passing the uniform beam (11) through a collimator (9) at the front end of a tumor to get a uniform beam spot (12) of the same shape as the tumor. By using the treatment method and the treatment device of the invention, a beam spot with a large radiation field of vision and high uniformity can be obtained, the beam spot is consistent with a patient's tumor area, and the patient's normal tissues are protected to the maximum extent. The method greatly reduces the difficulty in construction and control, and is not sensitive to position shift of tumors.

Description

technical field [0001] The invention belongs to the field of medical technology, and in particular relates to a method and a device for treating tumors by using a rotating scanning magnet to diffuse proton beams. Background technique [0002] Proton therapy mainly uses an accelerator to generate proton beams with a certain energy, and transmits the beams to the target area through various electromagnetic components to bombard tumor cells to achieve therapeutic effects. Since the energy loss of protons in substances presents a sharp Bragg peak, it can kill cancerous cells while protecting normal tissues to the greatest extent, which makes proton therapy one of the most advanced methods for treating malignant tumors in the world. [0003] Traditional proton therapy devices use treatment heads in two basic ways: scattering and scanning. Among them, the scattering method is to use multiple small-angle elastic Coulomb scattering of protons when passing through the scattering pla...

AI Technical Summary

Problems solved by technology

Among them, the scattering method is to use multiple small-angle elastic Coulomb scattering of protons when passing through the scattering plate to achieve the purpose of lateral beam expansion. The disadvantage of this device is that it is difficult to obtain a large irradiation field and a high uniformity of proton beams, and the structure Complicated, causing the rotating frame to be too bulky; the scanning method is to install a pair of scanning magnets on the treatment head, and obtain a uniform irradiation field by controlling the magnetic field changes of the scanning magnets. The disadvantage of this device is that it is sensitive to the displacement of the tumor itself and difficult to control Big

Images