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Proceedings Paper

Imaging with Iridium photons: an application in brachytherapy
Author(s): F. Verhaegen; S. Palefsky; D. Rempel; E. Poon
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Paper Abstract

In external-beam radiotherapy efforts are currently devoted to research on image-guided verification techniques. In brachytherapy the situation is far less advanced; usually, there is no treatment verification imaging. We are studying the possibility to use the photons emitted from a conventional 192Ir brachytherapy source for High Dose Rate (HDR) treatments, when inserted in a patient. We investigated whether the images can be used for dose delivery verification and to interrupt faulty dose deliveries. Phantoms were built to accommodate a remote controlled HDR 192Ir source. Images were collected with an x-ray intensifier, and predicted from calculations based on ray-tracing. For a bone/tissue/air/lung phantom with the source on top of the phantom measured contrasts were 8% (bone/tissue), 19% (tissue/lung) and 26% (lung/bone). When a thick Lucite slab was added on top of the contrast phantom, the contrasts decreased to 3, 7 and 10%, respectively, indicating that phantom scatter is an important issue. Differences between measured and simulated images and the influence of scatter were quantified. From this feasibility study it is concluded that imaging with 192Ir photons is possible but that work on scatter rejection through simulation and anti-scatter grids is needed.

Paper Details

Date Published: 14 March 2007
PDF: 11 pages
Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 65103S (14 March 2007); doi: 10.1117/12.707983
Show Author Affiliations
F. Verhaegen, McGill Univ. (Canada)
S. Palefsky, McGill Univ. (Canada)
D. Rempel, McGill Univ. (Canada)
E. Poon, McGill Univ. (Canada)


Published in SPIE Proceedings Vol. 6510:
Medical Imaging 2007: Physics of Medical Imaging
Jiang Hsieh; Michael J. Flynn, Editor(s)

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