Dose Course 2018_Flipping book

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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