1. Effect of beam profile measurement on arc therapy plan quality assurance: a case study.
- Author
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Kim LH, Malajovich I, Reyhan ML, Xue J, and Park JH
- Subjects
- Radiotherapy Planning, Computer-Assisted, Particle Accelerators, Quality Assurance, Health Care, Radiotherapy Dosage, Radiotherapy, Intensity-Modulated instrumentation, Radiotherapy, Intensity-Modulated methods
- Abstract
We present an example when profile measurement and modeling of an Elekta Agility multileaf collimator (MLC) had a large effect specifically on arc therapy plan quality assurance (QA) results using ArcCheck. ArcCheck absolute dose measurements of these plans were systematically lower than planned by 3-10%. Failing QA results were seen even with unmodulated static and conformal arcs. Furthermore, the effect was found to be dependent on collimator angle, with worse results associated with near-zero collimator angles. In contrast, step-and-shoot QA results were not affected. Changing the beam model to match steeper profile measurements obtained using a different measurement device resolved the problem. This case study demonstrates that conventional gamma index analysis can be sensitive to small profile modeling changes., (© 2017 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine.)
- Published
- 2017
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