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Proceedings Paper

Using radiance predicted by the P3 approximation in a spherical geometry to predict tissue optical properties
Author(s): Dwayne J. Dickey; Ronald B. Moore; John Tulip
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Paper Abstract

For photodynamic therapy of solid tumors, such as prostatic carcinoma, to be achieved, an accurate model to predict tissue parameters and light dose must be found. Presently, most analytical light dosimetry models are fluence based and are not clinically viable for tissue characterization. Other methods of predicting optical properties, such as Monet Carlo, are accurate but far too time consuming for clinical application. However, radiance predicted by the P3-Approximation, an anaylitical solution to the transport equation, may be a viable and accurate alternative. The P3-Approximation accurately predicts optical parameters in intralipid/methylene blue based phantoms in a spherical geometry. The optical parameters furnished by the radiance, when introduced into fluence predicted by both P3- Approximation and Grosjean Theory, correlate well with experimental data. The P3-Approximation also predicts the optical properties of prostate tissue, agreeing with documented optical parameters. The P3-Approximation could be the clinical tool necessary to facilitate PDT of solid tumors because of the limited number of invasive measurements required and the speed in which accurate calculations can be performed.

Paper Details

Date Published: 31 January 2001
PDF: 8 pages
Proc. SPIE 4156, Clinical Lasers and Diagnostics, (31 January 2001); doi: 10.1117/12.413701
Show Author Affiliations
Dwayne J. Dickey, Cross Cancer Institute (Canada)
Ronald B. Moore, Cross Cancer Institute (Canada)
John Tulip, Univ. of Alberta (Canada)


Published in SPIE Proceedings Vol. 4156:
Clinical Lasers and Diagnostics
Patrick Brouwer, Editor(s)

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