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What is the appropriate target volume for SBRT to a non-vertebral osseous metastasis?
Does your volume change based on fractionation (high-dose single fraction vs. 3-5 fractions)? Do you treat the entire circumference of long bones? What proximal/distal expansion? Are there situations where you treat only the GTV or GTV+small PTV expansion?
Answer from: Radiation Oncologist at Academic Institution
For non spine bone metastases, I usually treat the GTV with a 1 cm expansion of continguous bone to CTV + 0.3-0.5 cm margin in all dimensions to PTV. With this amount of contiguous bone, I will usually treat the entire circumference of the long bone. I rarely treat GTV + a small PTV expansion as ane...
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