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논문 기본 정보

자료유형
학술저널
저자정보
Hosang Jin (University of Oklahoma Health Sciences Center) Fredrick B. Jesseph (University of Oklahoma Health Sciences Center) Salahuddin Ahmad (University of Oklahoma Health Sciences Center)
저널정보
한국의학물리학회 의학물리 의학물리 제25권 제2호
발행연도
2014.6
수록면
65 - 71 (7page)
DOI
http://dx.doi.org/10.14316/pmp.2014.25.2.65

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초록· 키워드

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A Varian Portal Dosimetry system was compared to an isocentrically mounted MapCHECK 2 diode array forvolumetric modulated arc therapy (VMAT) QA. A Varian TrueBeam STx with an aS-1000 digital imaging panelwas used to acquire VMAT QA images for 13 plans using four photon energies (6, 8, 10 and 15 MV). TheEPID-based QA images were compared to the Portal Dose Image Prediction calculated in the Varian Eclipsetreatment planning system (TPS). An isocentrically mounted Sun Nuclear MapCHECK 2 diode array with 5 cmwater-equivalent buildup was also used for the VMAT QAs and the measurements were compared to a compositedose plane from the Eclipse TPS. A γtest was implemented in the Sun Nuclear Patient software with 10%threshold and absolute comparison at 1%/1 mm (dose difference/distance-to-agreement), 2%/2 mm, and 3%/3mm criteria for both QA methods. The two-tailed paired Student’s t-test was employed to analyze the statisticalsignificance at 95% confidence level. The average γpassing rates were greater than 95% at 3%/3 mm usingboth methods for all four energies. The differences in the average passing rates between the two methods werewithin 1.7% and 1.6% of each other when analyzed at 2%/2 mm and 3%/3 mm, respectively. The EPID passingrates were somewhat better than the MapCHECK 2 when analyzed at 1%/1 mm; the difference was lower for8 MV and 10 MV. However, the differences were not statistically significant for all criteria and energies (p-values>0.05). The EPID-based QA showed large off-axis over-response and dependence of γpassing rate on energy,while the MapCHECK 2 was susceptible to the MLC tongue-and-groove effect. The two fluence-based QAtechniques can be an alternative tool of VMAT QA to each other, if the limitations of each QA method (mechanicalsag, detector response, and detector alignment) are carefully considered.

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