Open AccessLight scattering artefacts in a funnel phantom using optical CT
Author(s) -
S. Bosi,
S. F. Brown,
Sarvenaz Sarabipour,
Yves De Deene,
Clive Baldock
Publication year - 2009
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/164/1/012021
Subject(s) - opacity , imaging phantom , optics , funnel , materials science , scanner , dosimeter , scattering , light scattering , physics , radiation , chemistry , organic chemistry
A gelatin phantom containing a funnel-shaped region of high opacity (or optical density OD) was used to examine light-scattering induced artefacts in a cone-beam optical CT scanner used for gel dosimetry. To correctly simulate polymer gel dosimeters, the opacity was introduced by adding a colloidal scatterer to the gelatin. In line profiles of OD taken from 3-D reconstructions of the funnel, those profiles with a long pathlength through high OD regions exhibited a "dishing" 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.5 page(s