Cryogen spray cooling (CSC) is used in conjunction with pulsed laser irradiation for treatment of dermatologic indications. The main goal of this study was to determine the radial temperature distribution created by CSC and evaluate the importance of radial temperature gradients upon the subsequent analysis of tissue cooling throughout the skin. Since direct measurement of surface temperatures during CSC are hindered by the formation of a liquid cryogen layer, temperature distributions were estimated using a thin, black aluminum sheet. An infrared focal plane array camera was used to determine the 2-D backside temperature distribution during a cryogen spurt, which preliminary measurements have shown is a good indicator of the front-side temperature distribution. The measured temperature distribution was approximately gaussian in shape. Next, the transient temperature distributions in skin were calculated for two cases: 1) the standard 1-D solution which assumes a uniform cooling temperature distribution, and 2) a 2-D solution using a nonuniform surface cooling temperature distribution based upon the back-side infrared temperature measurements. At the end of a 100-ms cryogen spurt, calculations showed that, for the two cases, large discrepancies in temperatures at the surface and at a 60-μm depth were found at radii greater than 2.5 mm. These results suggest that it is necessary to consider radial temperature gradients during cryogen spray cooling of tissue.
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December 2002
Technical Papers
Infrared Imaging of 2-D Temperature Distribution During Cryogen Spray Cooling
Bernard Choi,
Bernard Choi
Department of Biomedical Engineering; The University of Texas at Austin, Austin, TX 78712
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Ashley J. Welch
Ashley J. Welch
Department of Biomedical Engineering; The University of Texas at Austin, Austin, TX 78712
Search for other works by this author on:
Bernard Choi
Department of Biomedical Engineering; The University of Texas at Austin, Austin, TX 78712
Ashley J. Welch
Department of Biomedical Engineering; The University of Texas at Austin, Austin, TX 78712
Contributed by the Bioengineering Division for publication in the Journal of Biomechanical Engineering. Manuscript received Apr. 2001; revised manuscript received Jun. 2002. Associate Editor: M. Toner.
J Biomech Eng. Dec 2002, 124(6): 669-675 (7 pages)
Published Online: December 27, 2002
Article history
Received:
April 1, 2001
Revised:
June 1, 2002
Online:
December 27, 2002
Citation
Choi, B., and Welch, A. J. (December 27, 2002). "Infrared Imaging of 2-D Temperature Distribution During Cryogen Spray Cooling ." ASME. J Biomech Eng. December 2002; 124(6): 669–675. https://doi.org/10.1115/1.1517276
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