Dose delivery system for laser accelerated proton cancer treatment device

Abstract

The invention discloses a dose delivery system for a laser accelerated proton cancer treatment device. A quadrupole magnet focuses and restrains a proton beam generated by a laser plasma accelerator to form a centimeter-level wide beam, a scatterer turntable loaded with proton beams matched with different energies rotates to a corresponding gear (including a neutral gear and a beam blocking gear), and after the proton beams are scattered and transversely expanded, active wide proton beam superposition is implemented by a scanning dipolar magnet. A control module can realize energy modulation in the longitudinal direction by selecting proton beams with different energies and energy scattering in a determined proportion. According to the system, a scheme of combining scatterer beam expansion with wide proton beam superposition is adopted, insufficient radiation field uniformity caused by an overlarge emission angle of a proton beam driven by laser is avoided, scattering of the beam in a dose delivery process is reduced to the greatest extent by utilizing a longitudinal lamination method of actively selecting proton beams with different energies, the utilization rate of large energy scattering and large scattering angle proton beams generated by laser acceleration is improved.

Description

technical field [0001] The invention belongs to the technical field of proton radiotherapy, and in particular relates to a dose delivery system for a laser-accelerated proton cancer therapy device. Background technique [0002] Proton radiotherapy has attracted widespread attention due to its unique dosimetric advantages and relatively good biological effects since it was proposed, and is considered to be one of the most effective radiotherapy methods at present. The use of proton beams produced by a new type of laser plasma accelerator for tumor radiotherapy is a proton radiotherapy technology based on the rapidly developing laser acceleration technology. Since the laser plasma accelerator has an acceleration gradient several orders of magnitude higher than that of the traditional proton accelerator (cyclotron, synchronous or linear), it can greatly improve the compactness of the equipment on the basis of the current proton radiotherapy equipment to solve the problem of the...

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Problems solved by technology

[0004] Considering that the properties of proton beams driven by laser plasma accelerators are quite different from those produced by traditional accelerators (large energy divergence, large divergence angle, etc.), the dose delivery systems currently used in traditional proton radiotherapy devices cannot perform well. In line with the characteristics of laser-accelerated proton beams, the traditional scanning treatment head system requires high quality proton beams, while the traditional scattering treatment head system has limited improvement in the uniformity of the proton beam and faces the problem of low beam utilization. Able to make full use of proton beams with large energy dispersion and large dispersion angle for dose delivery

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