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Adaptation and validation of a commercial head phantom for cranial radiosurgery dosimetry end-to-end audit

Dimitriadis, Alexis, Palmer, AL, Thomas, RAS, Nisbet, Andrew and Clark, CH (2017) Adaptation and validation of a commercial head phantom for cranial radiosurgery dosimetry end-to-end audit British Journal of Radiology, 90 (1074).

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Abstract

Objectives: To adapt and validate an anthropomorphic head phantom for use in a cranial radiosurgery audit. Methods: Two bespoke inserts were produced for the phantom: one for providing the target and organ at risk for delineation, and one for performing dose measurements. The inserts were tested to assess their positional accuracy. A basic treatment plan dose verification with an ionisation chamber was performed to establish a baseline accuracy for the phantom and beam model. The phantom and inserts were then used to perform dose verification measurements of a radiosurgery plan. The dose was measured with alanine pellets, EBT-XD film and a plastic scintillation detector (PSD). Results: Both inserts showed reproducible positioning (±0.5 mm) and good positional agreement between them (±0.6 mm). The basic treatment plan measurements showed agreement to the Treatment Planning System (TPS) within 0.5%. Repeated film measurements showed consistent gamma passing rates with good agreement to the TPS. For 2%-2mm global gamma, the mean passing rate was 96.7% and the variation in passing rates did not exceed 2.1%. The alanine pellets and PSD showed good agreement with the TPS (-0.1 and 0.3% dose difference in the target) and good agreement with each other (within 1%). Conclusions: The adaptations to the phantom showed acceptable accuracies. The presence of alanine and PSD do not affect film measurements significantly, enabling simultaneous measurements by all three detectors. Advancements in knowledge: A novel method for thorough end-to-end test of radiosurgery, with capability to incorporate all steps of the clinical pathway in a time-efficient and reproducible manner, suitable for a national audit.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Dimitriadis, Alexisa.dimitriadis@surrey.ac.ukUNSPECIFIED
Palmer, ALUNSPECIFIEDUNSPECIFIED
Thomas, RASUNSPECIFIEDUNSPECIFIED
Nisbet, AndrewA.Nisbet@surrey.ac.ukUNSPECIFIED
Clark, CHUNSPECIFIEDUNSPECIFIED
Date : 25 May 2017
Identification Number : 10.1259/bjr.20170053
Copyright Disclaimer : © 2017 The Authors. Published by the British Institute of Radiology
Depositing User : Symplectic Elements
Date Deposited : 04 May 2017 07:46
Last Modified : 31 Oct 2017 19:20
URI: http://epubs.surrey.ac.uk/id/eprint/814104

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