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Dose in ICRU83
Reporting of absorbed dose
Why not D
100%
and D
0%
(the earlier definition of min and max
absorbed dose)?
E.g. PTV of 0.5 litres (radius 49.2 mm).
radius changed by less than 0.2 mm =>
1% change in volume
D98% and D2% serve the purpose to report
an absorbed dose that is not reliant on a
single computation point.