Journal
APPLIED OPTICS
Volume 39, Issue 34, Pages 6508-6514Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.39.006508
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We present a noninvasive method to track the concentration of photodynamic therapy drugs in real time. The method is based on measurements of backscattered and fluorescent light with a steady-state fluorescence spectrometer. The ratio of the fluorescent light to the scattered light is found to be linearly proportional to the absorption coefficient of the photosensitizer. The fiber-optic probe used for the measurements has a small source-detector separation; therefore the measurements could be performed through the working channel of an endoscope. (C) 2000 Optical Society of America OCIS codes: 170.3890, 170.5180.
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