Modelling optical scattering artefacts for varying pathlength in a gel dosimeter phantom

Stephen G. Bosi, Saxby Brown, Sarvenaz Sarabipour, Yves De Deene, Clive Baldock

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)

Abstract

A gelatin phantom containing an optically scattering funnel-shaped region of elevated optical density (OD) was used to examine light-scattering-induced artefacts in a cone-beam optical CT scanner used for gel dosimetry. To simulate polymer gel dosimeters, the opacity was introduced by adding a colloidal scatterer to the gelatin. Scatter results in an underestimate of OD (hence dose). In line profiles of OD taken from 3D reconstructions of the funnel, those profiles with a long pathlength through high OD regions exhibited a 'dishing' (or 'cupping') artefact, while those of short pathlength exhibited the opposite effect - 'doming'. These phenomena are accounted for by a model that includes the effect of stray, scattered light.

Original languageEnglish
Pages (from-to)275-283
Number of pages9
JournalPhysics in Medicine and Biology
Volume54
Issue number2
DOIs
Publication statusPublished - 21 Jan 2009
Externally publishedYes

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