Initial investigation of a novel light-scattering gel phantom for evaluation of optical CT scanners for radiotherapy gel dosimetry

Stephen Bosi, Pourandokht Naseri, Alicia Puran, Justin Davies, Clive Baldock

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

There is a need for stable gel materials for phantoms used to validate optical computerized tomography (CT) scanners used in conjunction with radiation-induced polymerizing gel dosimeters. Phantoms based on addition of light-absorbing dyes to gelatine to simulate gel dosimeters have been employed. However, to more accurately simulate polymerizing gels one requires phantoms that employ light-scattering colloidal suspensions added to the gel. In this paper, we present the initial results of using an optical CT scanner to evaluate a novel phantom in which radiation-exposed polymer gels are simulated by the addition of colloidal suspensions of varying turbidity. The phantom may be useful as a calibration transfer standard for polymer gel dosimeters. The tests reveal some phenomena peculiar to light-scattering gels that need to be taken into account when calibrating polymer gel dosimeters.
Original languageEnglish
Pages (from-to)2893-2903
Number of pages11
JournalPhysics in Medicine and Biology
Volume52
Issue number10
DOIs
Publication statusPublished - 2007
Externally publishedYes

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