Framebased-Frameless_DV_2017

Reporting dose

•

PTV or ITV D

95%

does not predict the minimum

dose to the GTV, because the PTV/ITV margin

consists mostly of low-density region.

Therefore, it makes more sense to

report the GTV dose

the PTV prescription does not predict the dose to the GTV.

•

Moreover, GTV dose seems to be a more

robust parameter

for

reporting (independent of delivery method).

•

By the way, usually the PTV margin is in lung tissue, where the

accurate dose calculation is most uncertain,

prescribing and

reporting

dose to this margin seems highly inaccurate!!!

SBRT 2017 - D. Verellen

T. Lacornerie, COL