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May 28, 2019

PTCOG58

Study of parameters and errors affecting performance of Synchrotron-based Proton Beam Scanning System

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position error

minMU

delivered dose distribution

Abstract

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14

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Abstract

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Keywords

position error

minMU

delivered dose distribution

Abstract

Aim: To optimize the overall performance of a Synchrotron-based Proton Beam Scanning System (SPBSS) during the commissioning, spot scanning parameters and errors in beam delivery has been studied extensively. Methods: A synchrotron-based proton therapy system (Shanghai Advanced Proton Therapy project, SAPT) is currently under beam commissioning. A SPBSS simulation platform has been developed to calculate resulting dose distribution in water phantom or patient cases, as well as beam delivery time for specified parameters. Major parameters variations may cause dose error, including spot position error, beam size variation due to slow extraction spill characters and spot weight errors. Based on the GEANT4 Monte Carlo calculations and beam measurements data, a set of data libraries and parameters, which represent the various combination of major performance or error contributors, has been determined and used as base data for the treatment planning system-matRad and SPBSS simulation. Their individual and combined effect against treatment planning spot configuration and optimization method on the dose distribution is quantified. Results: The configuration of SPBSS and treatment planning parameters are trade-offs between the system reliability, treatment efficiency and plan quality. Comprehensive relations between selected parameters are visualized with plots. Conclusions: To speed up the commissioning as well as provide a baseline for machine tuning, the relation between those TPS parameters, imperfections of beam delivery system and resulting dose errors has been studied to find optimal configuration sets for performance optimization of representative treatments.

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© Copyright 2019 Morressier GmbH.
All rights reserved.