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Development of a Detector for Fast Treatment Plan Verification

Shaikh, Saad; Radogna, Raffaella; Kelleter, Laurent; Jolly, Simon; Price, Tony; (2019) Development of a Detector for Fast Treatment Plan Verification. Presented at: PPRIG Proton Physics Workshop 5, Teddington, UK. Green open access

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Abstract

Treatment plan verification (TPV), or patient-specific quality assurance (patient QA), in Proton Beam Therapy requires detailed information about the volumetric dose deposition within an instrumented volume, to ensure the accurate delivery of dose for a given treatment plan. Current methods of patient QA are time-consuming, necessitating the repeated scanning of water phantoms. A collaboration between the High Energy Physics group at University College London and the Physics Dept. at the University of Birmingham is developing a prototype system for fast patient QA. Single-module plastic scintillator-based calorimeters were developed at UCL for the SuperNEMO high energy physics experiment that provide fast, accurate measurements of proton energy; these are combined with 2D particle position information from the Birmingham silicon trackers developed for the PRaVDA proton CT project to reconstruct the position and energy of each proton. This provides the potential for reconstructing the 3D dose deposition for individual protons and therefore build up the complete volumetric dose distribution for a given treatment plan. This would require each field to be delivered only once, rather than repeatedly as is the case for existing methods. We present preliminary measurements made at the 36 MeV Birmingham University cyclotron with a 3 cm PMT-based calorimeter module coupled to a single PRaVDA tracker module. Single-proton measurements made by the tracker were successfully correlated with energy measurements made with the calorimeter, and position and energy distributions for a variety of collimator configurations were reconstructed: further measurements with higher beam rates and improved detector triggering are planned. We also discuss ways in which this simple prototype can be scaled up to provide treatment plan verification without the need for rescanning.

Type: Poster
Title: Development of a Detector for Fast Treatment Plan Verification
Event: PPRIG Proton Physics Workshop 5
Location: Teddington, UK
Dates: 07 - 08 February 2019
Open access status: An open access version is available from UCL Discovery
Publisher version: http://www.pprig.co.uk/meetings/
Language: English
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10192886
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