ESTRO 2023 - Abstract Book

S1709

Digital Posters

ESTRO 2023

delivered with protons, patients 1/2/3/4/5 receive 4/0/2/4/1 proton fractions, which yield TCP increases of 46.1/0/18.7/47.9/4.2% compared to pure photon treatments. Thereby, all patients reach a TCP above 90%. With a sufficiently high number of available proton slots, the average TCP of the patient cohort can be increased by up to 24.9%.

Conclusion Conclusion: Limited proton resources can be optimally exploited via CPPT by increasing the PTV dose in proton fractions and allocating them to patients with the highest increase in TCP. [1] A. Lausch et al., Br. J. Radiol., vol. 86, no. 1027, 2013, doi: 10.1259/bjr.20130147.

PO-1950 Combined proton-photon radiotherapy for prostate cancer using a horizontal fixed proton beamline

L. Marc 1 , K.P. Subedi 1,2 , G. Candinas 1 , S. Fabiano 1 , A.J. Lomax 3,2 , J. Unkelbach 1