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Shortening the delivery time of proton therapy by real-time compensation method with raster scanning

Nuclear Science and Techniques 2022年第6期33卷 62-74页

作者： Xiang-Shang Sun Yong-Jiang Li Jun-Ya Liu Wen-Tao Liao Chao Wu Yue-Hu Pu Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Shanghai APACTRON Particle Equipment Co. LtdShanghai 201800China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China Medical Equipment Innovation Research Center West China HospitalSichuan UniversityChengdu 610041China

Among the various scanning techniques, spot and raster scanning are the most frequently adopted. raster scanning turns off the beam only when each isoenergy slice irradiation is completed. This feature intrinsically solves the leakage dose and frequent beam-switching problems encountered during spot scanning. However, to shorten the delivery time of raster scanning, a sophisticated dose control strategy is required to guarantee dose *** this study, a real-time compensation method with raster scanning for synchrotron systems was designed. It is characterized by a small spot-spacing planning strategy and real-time subtraction of the transient number of particles delivered between two planning-spot positions from the planned number of particles of the subsequent raster *** efficacy of the compensation method was demonstrated by performing accurate raster scanning simulations with an in-house simulation code and accurate final dose evaluations with a commercial treatment planning *** the similar dose evaluation criteria under a practical high scanning speed, compared with the spot scanning method, the total delivery time of the compensated raster scanning method was significantly shortened by 53.3% in the case of irradiating a cubical target and by 28.8% in a pelvic case. Therefore, it can be concluded that real-time compensated raster scanning with a fast scanning configuration can significantly shorten the delivery time compared to that of spot scanning. It is important to reduce the pressure on patients caused by prolonged immobilization and to improve patient throughput capacity at particle therapy centers.

关键词： Proton therapy raster scanning Delivery time scanning simulation

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Selection of Acquisition Scan Methods in Intersatellite Optical Communications

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Chinese Journal of Lasers 2002年第5期11卷 45-49页

作者：于思源高惠德马晶董蕴华马祖光 Harbin Institute of Technology National Key Laboratory of Tunable Laser Technology Harbin 150001 Harbin Institute of Technology National Key Laboratory of Tunable Laaer Technology Harbin 150001

In this paper, a theoretical model of the acquisition in intersatellite optical communications (IOC) is founded with the assumption that beacon pointing errors could be modeled as Gaussian random variables. An optimal scan method should be chosen according to the average acquisition time under a certain acquisition probability. With analysis of the most common scan methods during the establishment of IOC, the raster spiral scanning can substitute the spiral scanning is found. The raster scanning and raster spiral scanning are simulated using Monte Carlo method and the result shows the first one is optimal for acquisition in IOC.

关键词： intersatellite optical communications raster scanning spiral scanning raster spiral scanning

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