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How do you use a 4D CT to account for hepatocellular carcinoma tumor motion?
When planning SBRT cases for primary liver cancers, it is very difficult to see the tumor on the non-contrast 4D scan. How do you use information from the 4D CT to account for movement in your PTV expansion?
Answer from: Radiation Oncologist at Academic Institution
If your IGRT solution is KV imaging, then implanted fiducals are very important for multiple reasons. However, to take full advantage of having them in place, I recommend using an inspiration breath hold technique as well using the Varian RPM system or gating belt that comes with the True Beam. This...
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Answer from: Radiation Oncologist at Community Practice
This is easiest if you use permanent implanted fiducial markers. I typically ask the radiologists to implant the markers "near" the tumor, and as with all fiducials, they serve as a surrogate for being able to see the tumor. The more fiducials you have in place, the easier time you'll ha...