How do you typically prescribe dose to a PTV for standard IMRT plans?

Each PTV has three constraints:

>/= 95% of PTV receives 100% of RX dose

Max hot spot </=110%

>/=99% of PTV receives >/= 93% of Rx Dose

For the top dose level:

95% of the PTV receives 100% of the dose

100% of the PTV receives 95% of the dose

0% of the PTV receives >105% of the dose

For patients with gross disease, additionally ask for 100% of the GTV to receive 100% of the dose.

For newer dose calculation algorithms, e.g., monte car...

Technically, ICRU 83 is supposed to be of guidance here.

In reality, no one I know strictly hews to the ICRU 83. We're all a bit rogue.

And remember that the PTV is strictly a geometric, non-clinical construct designed to give adequate doses to GTVs/CTVs.

Re: "When you write a prescription dose for an ...