Tumor treatment method and device employing variable voltage rotational scanning magnet to diffuse proton beam

Abstract

The invention relates to a tumor treatment method and device employing a variable voltage rotational scanning magnet to diffuse a proton beam. The method comprises the following steps: a diverged proton beam (10) is converged via a focusing element (1), the converged proton beam (10) is diffused via the variable voltage rotational scanning magnet (3) so as to enable the diffused proton beam to periodically rotate around a proton center, and there for a large-scope uniform beam (11) with a different diameter is formed, and the uniform beam (11) is adjusted via a collimator (9) arranged on a front segment of a tumor; a part, positioned outside a tumor zone, of the proton beam is blocked, and a uniform beam spot (12) which has the same shape as the tumor is obtained. Via use of the proton treatment method and device disclosed in the invention, the beam spot which is large in irradiation visual field and high in uniformity can be obtained, an area of the beam spot is consistent with an area of the tumor zone of a patient, a dosage applied to the tumor can be adjusted conveniently, normal tissue of the patient can be protected to a maximum degree, control difficulty can be greatly lowered via the method, and the proton treatment method and device are not sensitive to position change of the tumor.

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 variable voltage rotating scanning magnets 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 th...

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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

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