Commissioning and quality assurance of a commercial stereotactic treatment-planning system for extracranial IMRT

Journal of Applied Clinical Medical Physics
Lu WangCharlie Ma

Abstract

A 3D treatment-planning system (TPS) for stereotactic intensity-modulated radiotherapy (IMRT) using a micro-multileaf collimator has been made available by Radionics. In this work, we report our comprehensive quality assurance (QA) procedure for commissioning this TPS. First, the accuracy of stereotaxy established with a body frame was checked to ensure accurate determination of a target position within the planning system. Second, the CT-to-electron density conversion curve used in the TPS was fitted to our site-specific measurement data to ensure the accuracy of dose calculation and measurement verification in a QA phantom. Using the QA phantom, the radiological path lengths were verified against known geometrical depths to ensure the accuracy of the ray-tracing algorithm. We also checked inter- and intraleaf leakage/transmission for adequate jaw settings. Measurements for dose verification were performed in various head/neck and prostate IMRT treatment plans using the patient-specific optimized fluence maps. Both ion chamber and film were used for point dose and isodose distribution verifications. To ensure that adjacent organs at risk receive dose within the expectation, we used the Monte Carlo method to calculate dose dist...Continue Reading

References

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Citations

Oct 27, 2011·Nihon Hoshasen Gijutsu Gakkai zasshi·Daisaku TatsumiMasako Hosono
May 7, 2020·Journal of Applied Clinical Medical Physics·Justin LeeAnanth Ravi
Aug 8, 2013·Technology in Cancer Research & Treatment·K M GaneshM Ravikumar
Jun 24, 2015·Journal of Applied Clinical Medical Physics·Travis R DentonAaron C Spalding
Aug 22, 2008·Journal of Applied Clinical Medical Physics·Olivia Amanda García-GarduñoMercedes Rodríguez-Villafuerte
May 22, 2009·Journal of Applied Clinical Medical Physics·R Alfredo Siochi

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Software Mentioned

RT2
RT
RIT113
AcQsim
Radionics
EGS4
[UNK]

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