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Proceedings Paper

Confocal fluorescence microscopy, microspectrofluorimetry, and modeling studies of laser-induced fluorescence endoscopy (LIFE) of human colon tissue
Author(s): Ralph Sebastian DaCosta; Lothar D. Lilge; James Kost; Maria Cirroco; Shirley Hassaram; Norman E. Marcon; Brian C. Wilson
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Paper Abstract

In vivo LIF spectroscopy and imaging, using 442 nm exc. light, delineates normal form adenomatous colonic tissue. This study investigates the microscopic origin of the observed tissue autofluorescence differences using confocal fluorescence microscopy, histological analysis, confocal microspectrofluorimetry and Monte Carlo simulation. A multilayered tissue model is developed for normal, flat and polypoid adenomas, based on: (1) tissue architecture, (2) optical properties, (3) fluorescence distribution, and (4) illumination/detection geometries. Major differences were found in fluorescence intensity and spectral lineshape between normal and adenomatous colon samples. Fluorescence spectral composition of normal and adenomatous colon autofluorescence is tissue depth-dependent for normal, premalignant, and malignant tissues. Mathematical modeling suggests that LIF measurements are primarily sensitive to changes in tissue morphology specific to pathological progression, including mucosal thickening, alteration in mucosal tissue constituents, redistribution of submucosal collagen and significantly increased blood volume.

Paper Details

Date Published: 16 June 1997
PDF: 10 pages
Proc. SPIE 2975, Laser-Tissue Interaction VIII, (16 June 1997); doi: 10.1117/12.275463
Show Author Affiliations
Ralph Sebastian DaCosta, Ontario Cancer Institute/Univ. of Toronto (Canada)
Lothar D. Lilge, Ontario Laser and Lightwave Research Ctr. (Canada)
James Kost, Ontario Laser and Lightwave Research Ctr. (Canada)
Maria Cirroco, Wellesley Central Hospital (Canada)
Shirley Hassaram, Wellesley Central Hospital (Canada)
Norman E. Marcon, Wellesley Central Hospital (Canada)
Brian C. Wilson, Ontario Cancer Institut/Univ. of Toronto and Ontario Laser and Lightwave Research Ctr. (Canada)

Published in SPIE Proceedings Vol. 2975:
Laser-Tissue Interaction VIII
Steven L. Jacques, Editor(s)

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