Dose-response of deformable radiochromic dosimeters for spot scanning proton therapy
Authors
Jensen SV, Valdetaro LB, Poulsen PR, Balling P, Petersen JBB, Muren LP
Source
Phys Imaging Radiat Oncol. 2020 Nov 20;16:134-137
Publicationdate
20 Nov 2020
Intrafractional motion and deformation influence proton therapy delivery for tumours in the thorax, abdomen and pelvis. This study aimed to test the dose–response of a compressively strained three-dimensional silicone-based radiochromic dosimeter during proton beam delivery. The dosimeter was read-out in its relaxed state using optical computed tomography and calibrated for the linear energy transfer, based on Monte Carlo simulations. A three-dimensional gamma analysis showed a 99.3% pass rate for 3%/3 mm and 93.9% for 2%/2 mm, for five superimposed measurements using deformation-including Monte Carlo dose calculations as reference. We conclude that the dosimeter’s dose–response is unaffected by deformations.