Establishing action levels for EPID-based QA for IMRT.

Journal of Applied Clinical Medical Physics
Rebecca M HowellChristie S Jarrio

Abstract

Although portal dosimetry is used to provide quality assurance (QA) for intensity-modulated radiation therapy (IMRT) treatment plans, trends in agreement between the portal dose prediction (PDP) and the measured dose have not been clarified. In this work, we evaluated three scalar parameters of agreement for 152 treatment plans (1152 treatment fields): maximum gamma (gamma max), average gamma (gamma avg), and percentage of the field area with a gamma value greater than 1.0 (gamma % > 1). These data were then used to set clinical action levels based on the institutional mean and standard deviations. We found that agreement between measured dose and PDP was improved by recalculating the fields at lower dose rates. We conclude that action levels are a useful tool for standardizing the evaluation of EPID-based IMRT QA.

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Citations

Apr 28, 2011·Medical Physics·Daniel A LowMark Oldham
Sep 18, 2014·Physics in Medicine and Biology·Mark PodestaFrank Verhaegen
Apr 3, 2016·Medical Physics·Jennifer M Steers, Benedick A Fraass
Mar 20, 2010·Australasian Physical & Engineering Sciences in Medicine·Kathleen J Roxby, Jeffrey C Crosbie
Oct 9, 2009·Medical Physics·Daniel W BaileyMatthew B Podgorsak
Sep 11, 2014·Journal of Applied Clinical Medical Physics·Kiley B PulliamStephen F Kry
Jan 10, 2012·Medical Physics·Sean L BerryCheng-Shie Wuu
Feb 21, 2018·Journal of Applied Clinical Medical Physics·WuiAnn WoonJamsari Khalid
Feb 27, 2018·Medical Physics·Cassandra Stambaugh, Gary Ezzell
Nov 18, 2010·Journal of Applied Clinical Medical Physics·Dayananda Shamurailatpam SharmaSuman Mallik
Dec 25, 2015·Journal of Applied Clinical Medical Physics·Ji-Hye SongTae Suk Suh
Feb 5, 2019·Medical Physics·Lydia J WilsonChristopher W Schneider
Jul 7, 2012·Journal of Applied Clinical Medical Physics·Daniel W BaileyMatthew B Podgorsak
Jul 17, 2010·Medical Physics·Jin Sheng LiChang-Ming Ma
Aug 28, 2019·Reports of Practical Oncology and Radiotherapy : Journal of Greatpoland Cancer Center in Poznań and Polish Society of Radiation Oncology·Niyas PuzhakkalVysakh Raveendran
Jun 7, 2021·Cancer radiothérapie : journal de la Société française de radiothérapie oncologique·T CuiX-F Xing

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Methods Mentioned

BETA
irradiating

Software Mentioned

Portal Vision System
ARIA
MapCHECK
Eclipse
Varian Portal Dosimetry System

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