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Proceedings Paper

Multitasking optical fiber probes for fluence-rate and fluorescent drug monitoring in vivo
Author(s): Lothar D. Lilge; Natalie Pomerleau; Brian W. McIlroy; Leonid Vesselov
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Paper Abstract

The development and implementation of PDT dosimetry for deep-seated tumors, is limited by the availability of clinically acceptable sensors capable of monitoring all PDT- efficacy determining parameters throughout the treatment volume. Here we present a multitasking optical fiber probe, with 250 micrometers OD, for the detection of the fluence-rate, photosensitizer concentration and partial oxygen pressure at one to five positions along the length of the optical fiber. The performance characteristics and preliminary evaluation of these fiber probes are described. The fluence-rate can be measured to better than 10 percent of the true value with a detection limit of < 10 (mu) W cm-1. The detection limit for photosensitizer concentration is determined by the fluorescent quantum yield and the fluence rate at the sensor position. For typical PDT treatment conditions the detection limit for Photofrin is approximately 1 (mu) g ml-1. The partial oxygen can be quantified for pO2 < 2 mmHg.

Paper Details

Date Published: 29 March 2000
PDF: 8 pages
Proc. SPIE 3909, Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy IX, (29 March 2000); doi: 10.1117/12.379883
Show Author Affiliations
Lothar D. Lilge, Univ. of Toronto and Photonics Research Ontario (Canada)
Natalie Pomerleau, Univ. of Toronto (Canada)
Brian W. McIlroy, Univ. of Toronto (Canada)
Leonid Vesselov, Walsh Medical Devices, Inc. (Canada)


Published in SPIE Proceedings Vol. 3909:
Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy IX
Thomas J. Dougherty, Editor(s)

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