2034-2035 / 2953
Gamma analysis considerations
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Local or global dose deviation can be used
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Global: deviation expressed as percentage of maximum or prescribed
dose
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Local: deviation expressed as percentage of local dose
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Global dose deviation more forgiving, especially in low-dose region
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Gamma analysis fails extensively in the low-dose region, but this may not be
of interest: cut-off often applied
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Can be performed in 2D or 3D: slightly better pass rates with 3D
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Adjustment for the linac output of the day?
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Adjust spatial registration of dose distributions for best result?
05/04/2016