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Journal of Biomedical Optics

Novel dental dynamic depth profilometric imaging using simultaneous frequency-domain infrared photothermal radiometry and laser luminescence
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Paper Abstract

A high-spatial-resolution dynamic experimental imaging setup, which can provide simultaneous measurements of laserinduced frequency-domain infrared photothermal radiometric and luminescence signals from defects in teeth, has been developed for the first time. The major findings of this work are (i) radiometric images are complementary to (anticorrelated with) luminescence images, as a result of the nature of the two physical signal generation processes; (ii) the radiometric amplitude exhibits much superior dynamic (signal resolution) range to luminescence in distinguishing between intact and cracked sub-surface structures in the enamel; (iii) the radiometric signal (amplitude and phase) produces dental images with much better defect localization, delineation, and resolution; (iv) radiometric images (amplitude and phase) at a fixed modulation frequency are depth profilometric, whereas luminescence images are not; and (v) luminescence frequency responses from enamel and hydroxyapatite exhibit two relaxation lifetimes, the longer of which (;ms) is common to all and is not sensitive to the defect state and overall quality of the enamel. Simultaneous radiometric and luminescence frequency scans for the purpose of depth profiling were performed and a quantitative theoretical two-lifetime rate model of dental luminescence was advanced.

Paper Details

Date Published: 1 January 2000
PDF: 9 pages
J. Biomed. Opt. 5(1) doi: 10.1117/1.429965
Published in: Journal of Biomedical Optics Volume 5, Issue 1
Show Author Affiliations
Lena Nicolaides, Univ. of Toronto and Materials Manufacturing Ontario (Canada)
Andreas Mandelis, Univ. of Toronto and Materials Manufacturing Ontario (Canada)

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