Infrared imaging of CO2 laser ablation: implications for laser skin resurfacing

Bernard Choi; Jennifer Kehlet Barton; Eric K. Chan; Sharon L. Thomsen M.D.; Ashley J. Welch

doi:10.1117/12.312306

1 July 1998 Infrared imaging of CO₂ laser ablation: implications for laser skin resurfacing

Bernard Choi, Jennifer Kehlet Barton, Eric K. Chan, Sharon L. Thomsen M.D., Ashley J. Welch

Proceedings Volume 3245, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems VIII; (1998) https://doi.org/10.1117/12.312306
Event: BiOS '98 International Biomedical Optics Symposium, 1998, San Jose, CA, United States

Abstract

Surface temperature measurements and CCD video imaging were performed during multiple pulse irradiation on in vivo rat skin. A TruPulse laser (100-microsecond pulsewidth, 3 mm X 3 mm spot size) was used at radiant exposures of 2.4 J/cm² and 3.9 J/cm² for all experiments. Temperatures were recorded with a thermal camera. During multiple pulse irradiation, one pulse per second was applied to a single site. A total of fifteen pulses were applied to a single spot. Irradiating with 2.4 J/cm² pulses led to a slow temperature rise that reached steady state at approximately 200 degrees Celsius. Carbonization onset occurred after pulses 5 - 8. With a higher radiant exposure of 3.9 J/cm², carbonization occurred after the third pulse; after the tenth pulse, focal tissue burning was visible, and the temperature oscillated around 350 degrees Celsius. Surface temperatures were measured during clinical scans. Areas of 3 cm X 3 cm were treated by the laser, which was moved across the tissue in a raster scan with 8 pulses per second. Each area was treated three times. From analysis of histological sections, the thermal damage as a function of pass number and radiant exposure was noted. Contrary to previous reports, the epidermis was not removed after the first pass. Indeed, after three passes, the epidermis was still present (H_o equals 2.4 J/cm²) or was severely fragmented (H_o equals 3.9 J/cm²).

Citation Download Citation

Bernard Choi, Jennifer Kehlet Barton, Eric K. Chan, Sharon L. Thomsen M.D., and Ashley J. Welch "Infrared imaging of CO₂ laser ablation: implications for laser skin resurfacing", Proc. SPIE 3245, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems VIII, (1 July 1998); https://doi.org/10.1117/12.312306

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