First 3D measurements of proton beams in a deformable silicone-based dosimeter

Ellen Marie Høye, Michal Sadel, Laura Patricia Kaplan, Peter Sandegaard Skyt, Ludvig Muren, Jørgen B.B. Petersen, Jan Swakoń, Gabriela Mierzwińska, Marzena Rydygier, Leszek Malinowski, Peter Balling

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Abstract

3D dosimetry provides high-resolution dose information of radiation therapy (RT), and is explored to enable and secure high-quality delivery of advanced RT modalities, including proton therapy. We present the first 3D measurements of spot-scanning proton plans in a silicone-based, radiochromic dosimeter with deformation properties. The dose information was read-out by optical CT-scanning. We found that the dosimeter signal was quenched close to the Bragg peak, and that this had a large impact on a measured spread-out Bragg peak. The dose response was linear both in the entrance region and in the Bragg peak, however, the dose response significantly reduced in the Bragg peak. Quenching was attributed to a linear-energy-transfer dependent dose response. Linear energy transfer distributions for each proton treatment plan will provide a means for calibrating the optical measurement to linear energy transfer, as well as dose. This might enable use of the silicone-dosimeter in quality assurance of proton beams.

Original languageEnglish
Article number012021
Book seriesJournal of Physics: Conference Series (Online)
Volume847
Issue1
Pages (from-to)1-4
Number of pages4
ISSN1742-6588
DOIs
Publication statusPublished - 2017

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