ATP Barcelona 2017

Range uncertainty

Energy (statistic) Patient positioning (statistic)

Adapted from Lomax T. (AAPM Summer School 2015)

Inherent CT uncertainties, e.g beam hardening, calibration (systematic)

Increase of potential magnitude

Distal end RBE enhancements (systematic)

CT artifacts (systematic)

Changes in patient anatomy (systematic & statistic)

Estimated sum of range uncertainties: ~3 - 5% Range uncertainties are likely to be systematic.

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