Dosimetric Characteristics of Clinical Photon Beams

Characterizing Clinical Photon
Caveats (continued):
Beams in 3DRTPS
� One can always use a set of beam modeling parameters
to get the best agreement between the computed and
measured beam data in a phantom phantom. .
�However, that would not be a sufficient condition for robust and
accurate beam modeling .
� The value or function used to describe a parameter
should have some physical meaning.
�each parameter used in the dose calculation algorithm should
model the physical reality it represents even if there is less than
perfect agreement between measure and computed data.
� The observed differences often reflect limitations of the dose
computation algorithm