Abstract
Optimal target definition is crucial in stereotactic radiotherapy (SRT) for stage I lung cancer due to high fraction doses and steep dose gradients. Accurate determination of target volume (TV) in 4DCT can be time-consuming when delineating 10 phase bins, or sub-optimal when using MIP. We compared target definition using (a) MIP with review of end-respiratory phases of the 4DCT scan with (b) contour propagation in all phases of 4DCT using a deformable registration tool.
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