Visible lesion thresholds and model predictions for Q-switched 1318-nm and 1540-nm laser exposures to porcine skin

Justin J. Zohner; Kurt J. Schuster; Lucas J. Chavey; David J. Stolarski; Semih S. Kumru; Benjamin A. Rockwell; Robert J. Thomas; Clarence P. Cain

doi:10.1117/12.644757

1 March 2006 Visible lesion thresholds and model predictions for Q-switched 1318-nm and 1540-nm laser exposures to porcine skin

Justin J. Zohner, Kurt J. Schuster, Lucas J. Chavey, David J. Stolarski, Semih S. Kumru, Benjamin A. Rockwell, Robert J. Thomas, Clarence P. Cain

Author Affiliations +

Proceedings Volume 6084, Optical Interactions with Tissue and Cells XVII; 60840E (2006) https://doi.org/10.1117/12.644757
Event: SPIE BiOS, 2006, San Jose, California, United States

Abstract

Skin damage thresholds were measured and compared with theoretical predictions using a skin thermal model for near-IR laser pulses at 1318 nm and 1540 nm. For the 1318-nm data, a Q-switched, 50-ns pulse with a spot size of 5 mm was applied to porcine skin and the damage thresholds were determined at 1 hour and 24 hours postexposure using Probit analysis. The same analysis was conducted for a Q-switched, 30-ns pulse at 1540 nm with a spot size of 5 mm. The Yucatan mini-pig was used as the skin model for human skin due to its similarity to pigmented human skin. The ED₅₀ for these skin exposures at 24 hours postexposure was 10.5 J/cm² for the 1318-nm exposures, and 6.1 J/cm² for the 1540-nm exposures. These results were compared to thermal model predictions. We show that the thermal model fails to account for the ED₅₀ values observed. A brief discussion of the possible causes of this discrepancy is presented. These thresholds are also compared with previously published skin minimum visible lesion (MVL) thresholds and with the ANSI Standard's MPE for 1318-nm lasers at 50 ns and 1540-nm lasers at 30 ns.

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Justin J. Zohner, Kurt J. Schuster, Lucas J. Chavey, David J. Stolarski, Semih S. Kumru, Benjamin A. Rockwell, Robert J. Thomas, and Clarence P. Cain "Visible lesion thresholds and model predictions for Q-switched 1318-nm and 1540-nm laser exposures to porcine skin", Proc. SPIE 6084, Optical Interactions with Tissue and Cells XVII, 60840E (1 March 2006); https://doi.org/10.1117/12.644757

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