Abstract # 2862 Evaluation of Residual Deviation in Patient Positioning and its Impact on Dose Distribution for Proton Radiotherapy

Presenter: Arjomandy, Bijan

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A total of 592 measurements were done for all patients. The residual deviations were fit to a Gaussian distribution with σ = 0.255 ± 0.007 cm corresponding to 95% confidence level. However, in one case the residual deviation was greater than 2 cm. The dose distribution showed cold and hot spots with complex distributions that were produced based on tumor location relative to bony structures. Different structures received either higher or lower dose up to 15% in some cases.