Autofluorescence lifetime measurement on oral carcinogenesis
Journal
Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
Journal Volume
26 IV
Pages
2349-2351
Date Issued
2004
Author(s)
Abstract
Normaol and cancerous tissues have distinct autofluorescence lifetime because of their biophysical and biochemical differences. Protoporphyrin IX (PpIX) is a useful fluorophore, which generally accumulates more in cancerous cells than in normal cells due to heme synthesis pathway, is often employed in photodynamic detection and therapy. Under 410nm excitation, the main emission peak of PpIX is at 630nm. Autofluorescence lifetime at 630nm emission would be elongated if PpIX gathered more in cells. In this study, we tried to find if there exist significant differences of autofluorescence lifetime at 630nm (under 410nm excitation) between normal and cancerous tissues for in vivo measurement. The result shows that normal tissues in general have shorter lifetime (about 2.8?3.5 ns) than that of abnormal tissues. The measured data suggest that lifetime would get longer in accordance with the degree of carcinogenesis. For cancer tissues, the average autofluorescence lifetime was extended to be about 10ns. Furthermore, the efficiency of treatment could also be defined refer to the time-series of lifetime decline.
Subjects
Autofluorescence lifetime; Oral carcinogenesis; Protoporphyrin IX
SDGs
Other Subjects
Biosynthesis; Carcinogens; Cells; Fluorescence; Patient monitoring; Photodynamic therapy; Tissue; Tumors; Autofluorescence lifetime; Leukoplakia; Oral carcinogenesis; Protoporphyrin IX; Biomedical engineering
Type
conference paper