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Title: SU-F-T-165: Daily QA Analysis for Spot Scanning Beamline

Abstract

Purpose: The dosimetric results of our daily quality assurance over the last 8 years for discrete pencil beam scanning proton therapy will be presented. Methods: To perform the dosimetric checks, a multi-ion chamber detector is used, which consists of an array of 5 single parallel plate ion chambers that are aligned as a cross separated by 10cm each. The Tracker is snapped into a jig, which is placed on the tabletop. Different amounts of Solid Water buildup are added to shift the dose distribution. The dosimetric checks consist of 3 parts: position check, range check and volume dose check. Results: The average deviation of all position-check data were 0.2±1.3%. For the range check, the average deviation was 0.1%±1.2%, which also corresponds to a range stability of better than 1 mm over all measurements. The volumetric dose output readings were all within ±1% with the exception of 2 occasions when the cable to the dose monitor was being repaired. Conclusion: Morning QA using the Tracker device gives very stable dosimetric readings but is also sensitive to mechanical and output changes in the proton therapy delivery system.

Authors:
; ; ; ;  [1]
  1. MD Anderson Cancer Center, Houston, TX (United States)
Publication Date:
OSTI Identifier:
22642406
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 43; Journal Issue: 6; Other Information: (c) 2016 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
07 ISOTOPES AND RADIATION SOURCES; BEAM SCANNERS; IONIZATION CHAMBERS; PARTICLE TRACKS; PROTON BEAMS; QUALITY ASSURANCE; RADIATION DOSE DISTRIBUTIONS

Citation Formats

Poenisch, F, Gillin, M, Sahoo, N, Martin, C, and Zhu, X. SU-F-T-165: Daily QA Analysis for Spot Scanning Beamline. United States: N. p., 2016. Web. doi:10.1118/1.4956301.
Poenisch, F, Gillin, M, Sahoo, N, Martin, C, & Zhu, X. SU-F-T-165: Daily QA Analysis for Spot Scanning Beamline. United States. doi:10.1118/1.4956301.
Poenisch, F, Gillin, M, Sahoo, N, Martin, C, and Zhu, X. Wed . "SU-F-T-165: Daily QA Analysis for Spot Scanning Beamline". United States. doi:10.1118/1.4956301.
@article{osti_22642406,
title = {SU-F-T-165: Daily QA Analysis for Spot Scanning Beamline},
author = {Poenisch, F and Gillin, M and Sahoo, N and Martin, C and Zhu, X},
abstractNote = {Purpose: The dosimetric results of our daily quality assurance over the last 8 years for discrete pencil beam scanning proton therapy will be presented. Methods: To perform the dosimetric checks, a multi-ion chamber detector is used, which consists of an array of 5 single parallel plate ion chambers that are aligned as a cross separated by 10cm each. The Tracker is snapped into a jig, which is placed on the tabletop. Different amounts of Solid Water buildup are added to shift the dose distribution. The dosimetric checks consist of 3 parts: position check, range check and volume dose check. Results: The average deviation of all position-check data were 0.2±1.3%. For the range check, the average deviation was 0.1%±1.2%, which also corresponds to a range stability of better than 1 mm over all measurements. The volumetric dose output readings were all within ±1% with the exception of 2 occasions when the cable to the dose monitor was being repaired. Conclusion: Morning QA using the Tracker device gives very stable dosimetric readings but is also sensitive to mechanical and output changes in the proton therapy delivery system.},
doi = {10.1118/1.4956301},
journal = {Medical Physics},
number = 6,
volume = 43,
place = {United States},
year = {Wed Jun 15 00:00:00 EDT 2016},
month = {Wed Jun 15 00:00:00 EDT 2016}
}