What PTV margins do you use for definitive prostate radiation?

Topics: Radiation Oncology • Genitourinary Cancers

How does it vary by technique (standard fractionation, hypofractionation, or SBRT)? Does your PTV change if you are treating pelvic lymph nodes?

Answer from: Radiation Oncologist at Academic Institution

I tend to follow the RTOG/NRG trials' guidelines for each clinical situation when deciding on margins from CTV to PTV (which use progressively tighter margins based on whether one is doing standard, moderate hypo-, or extreme hypo-fractionation): For conventional fractionation, RTOG 0924 states 0.5...

Comments

Radiation Oncologist at Center for Neurosciences
Do you add a margin to the prostate itself in the ...

Radiation Oncologist at Emory University School of Medicine
When I treat whole pelvis, I boolean Prostate+SV+p...

Answer from: Radiation Oncologist at Academic Institution

In my opinion, the PTV should always be tailored to the situation and the steps that have been taken to minimize intra-fractional motion assuming daily imaging In our department for modest hypofractionation and standard fractionation for an intact prostate, we sim with a 3 mm slice CT , intra...

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