Abstract:Purpose:
The shape of a single beam in proton PBS influences the resulting dose distribution. Spot profiles are modelled as two‐dimensional Gaussian (single/ double) distributions in treatment planning systems (TPS). Impact of slight deviations from an ideal Gaussian on resulting dose distributions is typically assumed to be small due to alleviation by multiple Coulomb scattering (MCS) in tissue and superposition of many spots. Quantitative limits are however not clear per se.
Methods:
A set of 1250 deliberate… Show more
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