ESTRO 2024 - Abstract Book

S4191

Physics - Intra-fraction motion management and real-time adaptive radiotherapy

ESTRO 2024

Results:

For the homogeneous PMMA phantom, the spot-wise PGI range shifts comparing the fan-beam CT (reference) to the CBCT, corrected CBCT and virtual CT were close to zero with mean range shifts of 0.37, 0.25, -0.08 mm and standard deviations (2σ) of 0.29, 0.18 and 0.21 mm, respectively. Compared to the reference fan-beam CT data, the observed deviations in PGI simulations on the CBCT data followed very closely the deviations of the corresponding IDD calculations (correlation ρ=0.90).