ESTRO 2025 - Abstract Book

S2634

Physics - Detectors, dose measurement and phantoms

ESTRO 2025

(<0.5%) areas. Some of the observed differences appeared to be related to the lower calculation resolution (1mm) compared with the measurement resolution (0.2mm). Gamma agreement for 2%/1.5mm was 99.3%.

Conclusion: The semi-automatic implant definition, metal artifact reduction in CT and Monte Carlo calculation allow accurate modelling of complex spine metallic implants for treatment planning in proton therapy.

Keywords: Proton therapy, metallic implants

References: 1. The dosimetric impact of stabilizing spinal implants in radiotherapy treatment planning with protons and photons: standard titanium alloy vs. radiolucent carbon ‐ fiber ‐ reinforced PEEK systems. Doi:10.1002/acm2.12905. 2. Dose perturbation effect of metallic spinal implants in proton beam therapy. Doi:10.1120/jacmp.v16i5.5566