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- W43861337 abstract "In this work, several sets of acceptance criteria for the gamma-index (γ) were investigated for the dose verification of scanned carbon ion therapy. 40 verification measurements were retrospectively analyzed and the resulting measurement acceptance rate was compared to that based on the currently applied action levels for dose deviation to propose action levels for dose deviation to propose action levels for γ as well. Additionally, a correction of the measured dose values was performed and γ was recalculated to estimate acceptance criteria for an improved beam model.Using acceptance criteria of 7% for the dose deviation and 2 mm for the DTA, clinically acceptable results were obtained. Simulations showed that the acceptance criteria can be tightened, if the beam model is improved. To reproduce acceptance rates achieved with current action levels, two requirements for measurement acceptance are suggested for γ First, the mean γ per measurement has to be below one. Second, less than 30% of the individual measurement positions per measurement are allowed to exceed a γ of one.Keywordscarbon ion radiotherapydose verificationgamma-indexacceptance criteriaaction levels" @default.
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- W43861337 date "2009-01-01" @default.
- W43861337 modified "2023-09-25" @default.
- W43861337 title "Investigation of Acceptance Criteria for the gamma-index in Scanned Carbon Ion Radiotherapy" @default.
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- W43861337 doi "https://doi.org/10.1007/978-3-642-03902-7_65" @default.
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