ESTRO 2025 - Abstract Book

S2644

Physics - Detectors, dose measurement and phantoms

ESTRO 2025

The isocenter had a lower average deviation (0.39±0.21 mm) than the off-axis targets (0.49±0.25 mm). Linac1 showed smaller deviations (Fig.2a), and the overall maximum deviation found was 1.28 mm. Deviations greater than 1.0 mm were 1.9% in Linac1 and Linac2 and 3.2% in Linac2, located at more than 5.8 cm from the isocenter. Forty-five sensitivity tests were carried out. The introduced errors were detected in all linacs, the deviation from the field-target coincidence increased with the magnitude of the error and the off-axis targets presented a greater deviation compared to the isocentric target for same error (Fig.2b).