ESTRO 2024 - Abstract Book

S3517

Physics - Dose prediction, optimisation and applications of photon and electron planning

ESTRO 2024

Dmean (P<0.001). The only association was observed in the bladder volume that moderately correlated with bladder Dmean (R2 = 0.58) and bladder D40% (R2 = 0.61).

Figure 1. Comparison between DA (left) and SA (right) dose distributions in the axial (1) and sagittal (2) planes, with isodoses ranging from 50% to 105% of the prescribed dose. (3) Superposition of the DVHs of the CTV, PTV, rectum, and bladder for DA (solid line) and SA (dashed line) plans of the same patient. The mean SA treatment delivery time was reduced by 22%, passing from 2.1 minutes [1.7 – 3.0] to 1.5 minutes [1.3 – 1.9] on average (P<0.001) (Figure 2). The mean monitor units rose from 1819 ± 332 to 1967 ± 301 (P<0.001) due to higher plan complexity. Despite the increased fluence modulation, dose measurements reported an optimal agreement with dose calculations with a PR greater than 95% for 2%(local)-2 mm criteria (SA: 98.7; DA: 98.0%; P=0.004).