Abstract:4D treatment plans are optimized to compensates for a patient's individual respiratory motion. However, changes in the time spent in the each respiratory state may render a 4D plan invalid. We introduced and evaluate two robust treatment planning approaches to compensate for respiratory motion variations. Robust 4D plans can be designed either using an average pdf approach or a worst case pdf approach. We tested these approaches on two motion variation scenarios and compared them with nominal 4D optimization a… Show more
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