864 / 1359
Comparisons between measurement and
calculations
❑
Look at differences: do we use a substraction, a division (or ratio), in gray or in
%?
o
Then, in % of what?
❖
in % of max of beam dose or other “global” point/dose?
❖
in % of “local” dose?
❑
What are the data that we have?
o
point dose values? How many?
o
Curves or measurement along a liner i.e. PDD, profiles…
o
2D distributions e.g. from film or 2D-array system
o
3D distributions?
❑
What are the criteria that we should use?
❑
Should we reject all, if only a few points exceed the criterion in a specified case?
❑
Is it OK with the same criteria for the whole distribution?
❑
Is it reasonable to have the same criteria in simple and in very complex cases?
Dublin 2018
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