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A beam range monitor based on scintillator and multi-pixel photon counter arrays for heavy ions therapy

Nuclear Science and Techniques 2022年第10期33卷 11-21页

作者： Wei Wang Xiao-Xiao Yuan Xiao-Hong Cai Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

Fast beam range measurements are required to maximize the time available for patient treatment, given that the beam range requires verification with respect to quality assurance to maintain accelerator commissioning standards and ensure patient safety. A novel beam range monitor based on a plastic scintillator and multi-pixel photon counter (MPPC) arrays is therefore proposed in this paper. The monitor was constructed using 128 plastic scintillator films with a thickness of 1 mm and an active area of 50 × 50 mm^(2). A customized MPPC array read the scintillation light of each film. The advantage of dividing the active detector volume into films is that it intercepts the particle beam and enables direct differential light yield measurement in each film, in addition to depth-light curve generation without the need for image analysis A GEANT4 simulation, including scintillator quenching effects, was implemented, and the results revealed that Birks’ law exhibited a slight little influence on the position of the beam range, only changing the shape and absolute normalization of the Bragg curve, which is appropriate for the calculation of the beam range using the depth-light curve. The performance of the monitor was evaluated using a heavy-ion medical machine in Wuwei City, Gansu Province, China. The beam range measurement accuracy of the monitor was 1 mm, and the maximum difference between the measured and reference ranges was less than0.2%, thus indicating that the monitor can meet clinica carbon ion therapy requirements.

关键词： beam range Scintillator Multi-pixel photon counter(MPPC) Depth-light curve

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Pixelated prompt gamma imaging detector for online measurement of proton beam: Monte Carlo feasibility study by FLUKA

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Radiation Detection Technology and Methods 2018年第1期2卷 25-31页

作者： Jin-Long Wang LAlberto Cruz Michael Lu School of Astronomy and Space Science Nanjing UniversityNanjingChina NewRT Medical systems Inc.WuxiChina Peak Physics Consulting LLC.GuangzhouChina

Increased accuracy of proton beam delivery provides additional benefits to the patients undergo the treatment.A prompt gamma imaging detector can provide additional information during the treatment,as the prompt gammas produced by the interactions between protons and human tissues are related to the range and profile of the beam in the *** paper makes a Monte Carlo feasibility study for a pixelated prompt gamma imaging detector which can not only measure the proton range but also merge the beam profile and 3D beam image inside the *** simulation result shows that this detector can reduce background noise and measure the range and beam profile by using of grated shielding material,vertical gammas selection and a 5MeV energy window.

关键词： Proton therapy beam range Prompt gamma FLUKA

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