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Gastrointest Endosc. 1998 Oct;48(4):390-4.

Colonic polyp differentiation using time-resolved autofluorescence spectroscopy.

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  • 1Department of Medical Services, Massachusetts General Hospital, Boston 02114, USA.



Steady-state autofluorescence spectroscopy has been examined previously as a technique for distinguishing polyp types during colonoscopy. Although time-resolved methods have shown promise for tissue diagnosis in vitro, they have never been applied endoscopically. The aim of this study was to examine the feasibility of performing time-resolved autofluorescence spectroscopy in vivo and to determine the diagnostic accuracy of the technique as applied to colonic dysplasia.


A time-resolved spectrometer was used to measure the spectrally resolved transient decay of laser-induced autofluorescence emission from colonic tissue in vivo.


Seventeen patients with 24 polyps (13 adenomatous, 11 non-adenomatous) were studied. The autofluorescence decay from adenomas was faster than that from non-adenomas. The measured decay time provided a means of distinguishing adenomas from non-adenomas with a sensitivity of 85%, a specificity of 91%, a positive predictive value of 92%, and a negative predictive value of 83%.


Time-resolved autofluorescence spectroscopy is a promising optical diagnostic technique for determining polyp types in vivo.

[PubMed - indexed for MEDLINE]
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