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Proceedings Paper

Infrared imaging of CO2 laser ablation: implications for laser skin resurfacing
Author(s): Bernard Choi; Jennifer Kehlet Barton; Eric K. Chan; Sharon L. Thomsen; Ashley J. Welch
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Paper 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 (Ho equals 2.4 J/cm2) or was severely fragmented (Ho equals 3.9 J/cm2).

Paper Details

Date Published: 1 July 1998
PDF: 12 pages
Proc. SPIE 3245, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems VIII, (1 July 1998); doi: 10.1117/12.312306
Show Author Affiliations
Bernard Choi, Univ. of Texas/Austin (United States)
Jennifer Kehlet Barton, Univ. of Texas/Austin (United States)
Eric K. Chan, Indigo, Inc. (United States)
Sharon L. Thomsen, Univ. of Texas M.D. Anderson Cancer Ctr. (United States)
Ashley J. Welch, Univ. of Texas/Austin (United States)

Published in SPIE Proceedings Vol. 3245:
Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems VIII
Graham M. Watson; Harvey Lui; Lou Reinisch; Penny J. Smalley; Kenneth Eugene Bartels; R. Rox Anderson; Lawrence S. Bass; Kenneth Eugene Bartels; C. Gaelyn Garrett; Lloyd P. Tate; Sharon L. Thomsen; Reza S. Malek; Aaron P. Perlmutter; R. Rox Anderson; Lawrence S. Bass; C. Gaelyn Garrett; Kenton W. Gregory; Harvey Lui; Reza S. Malek; Aaron P. Perlmutter; Lou Reinisch; Penny J. Smalley; Lloyd P. Tate; Sharon L. Thomsen; Graham M. Watson, Editor(s)

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