Proton beam scanning device and scanning method based on radio frequency deflection cavity technology

Abstract

The invention provides a proton beam scanning device based on a radio frequency deflection cavity technology. The proton beam scanning device comprises a power source system, a radio frequency structure system and a low level system; the radio frequency structure system comprises a waveguide structure and a radio frequency deflection structure; the radio frequency deflection structure has two independent and orthogonal polarization directions and provides two independent and orthogonal transverse deflection forces for the proton beam; and the low level system independently controls the power levels of the two power source systems and simultaneously independently drives two electromagnetic fields in orthogonal polarization directions, and proton beams are emitted to different positions of an object to be scanned through vector superposition of two generated orthogonal transverse deflection forces. The invention further provides a corresponding scanning method. According to the device, through the radio frequency deflection structure with two independent orthogonal polarization directions, deflection at any solid angle is realized; and in combination with the low-level system, the output power level of the pulse microwave power can be rapidly changed by using the low-level system, so that the rapid conversion of the proton beam at any angle is realized.

Description

technical field [0001] The invention belongs to the technical field of proton beam scanning in proton therapy devices, and in particular relates to a proton beam scanning device and scanning method based on radio frequency deflection cavity technology. Background technique [0002] Flash therapy (FLASH) is the most cutting-edge technology in the field of radiotherapy. It is required to irradiate the tumor with a dose of no less than 30Gy within 100 milliseconds, that is, to produce an ultra-high dose rate of no less than 300Gy / s. Under the premise of not reducing the therapeutic effect of the irradiation dose on the target, the damage of the irradiation dose to normal tissues is greatly reduced. Proton therapy technology has the characteristics of remarkable therapeutic effect and wide application range among many radiation therapy methods. It is a treatment method that is being widely promoted in Europe, America, Japan and my country. At the same time, it is actively promot...

AI Technical Summary

Problems solved by technology

[0003] Proton beam scanning technology is the key technology in proton flash therapy devices. The existing proton beam scanning technology uses two scanning magnets with different deflection directions to scan the proton beam in different directions, which has problems such as long response time and hysteresis effect. , unable to meet the needs of flash therapy

At the same time, some proton therapy devices use point-by-point pencil beam scanning, which means that the beam needs to be stopped between two scanning points, so the scanning time of a single layer needs to reach the second level, let alone the multi-layer scanning. Flash therapy dose rate targets for individual treatment plans

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