Clinical use of pulsed photothermal radiometry

Thomas E. Milner; J. Stuart Nelson M.D.; N. Q. Tran; Abraham Katzir; Lars Othar Svaasand; Steven L. Jacques

doi:10.1117/12.147019

1 July 1993 Clinical use of pulsed photothermal radiometry

Thomas E. Milner, J. Stuart Nelson M.D., N. Q. Tran, Abraham Katzir, Lars Othar Svaasand, Steven L. Jacques

Proceedings Volume 1876, Lasers in Otolaryngology, Dermatology, and Tissue Welding; (1993) https://doi.org/10.1117/12.147019
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

The application of pulsed photothermal radiometry (PPTR) diagnostics to characterize port wine stain (PWS) lesions is discussed. A PPTR signal of a PWS in response to pulsed laser exposure is shown to consist of an initial `T-jump' due to epidermal melanin absorption and a `delayed thermal wave' resulting from laser generated heat in subsurface blood vessels diffusing to the skin surface. A prototype PPTR instrument incorporating an infrared fiber is constructed which facilitates convenient skin-site accessibility. Laser heating of the infrared collection optics results in an artifactual signal which overestimates the initial `T-jump.' Magnitude of the error is measured and a method to eliminate it is suggested.

Citation Download Citation

Thomas E. Milner, J. Stuart Nelson M.D., N. Q. Tran, Abraham Katzir, Lars Othar Svaasand, and Steven L. Jacques "Clinical use of pulsed photothermal radiometry", Proc. SPIE 1876, Lasers in Otolaryngology, Dermatology, and Tissue Welding, (1 July 1993); https://doi.org/10.1117/12.147019

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