Inverse-planned Respiratory Phase Gating in Lung Conformal Radiotherapy

The standard method of using a fixed respiratory phase, typically end-of-exhale, for respiratory gating does not necessarily result in the best OAR sparing. We use an inverse planning optimization approach and identify the patient-specific optimal gating phase for each beam considering (i) the state of the anatomy at each respiratory phase and (ii) the time spent in each phase.

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