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Phantoms for TPS verification and plan QA: use of solid plastics
If the solid plastic material is not water equivalent in the kV beam energy region at
which the CT scan is being performed, then the CT calibration curve will not correctly
represent the relationship between relative density and Hounsfield numbers.
In such a case, it is best to override the material density with the density of the
medium as given by its manufacturer
Use this description of the phantom for dose calculations and comparisons
of these against measurement in the phantom