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Thermal Modeling and Experimental Validation of Hair and Skin Tissue Heated by Intense Pulsed Light |
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6/2007-6/2008 |
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DESCRIPTION |
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Photothermolysis (PT) model has been extensively used to study laser-skin tissue interaction, but its application on Intense Pulsed Light (IPL) is rarely reported due to the polychromatic nature of IPL. The present study develops a numerical model to study the PT process of skin during IPL treatment for epilation (hair removal). The PT model first simulates the transport of IPL photons in skin tissue using a Monte Carlo (MC) model, while the tissue effective optical properties are estimated by spectrum-intensity-average. The MC model output is fed into a heat diffusion (HD) model, which is solved by a Finite Difference method to compute the temporal and spatial variation of skin temperature. The PT model is experimentally validated using an agar gel as a tissue phantom. Applying the model, a systematic parametric study is performed to quantify the effects of pulse fluence (5.0-7.0 J/cm2) and pulse duration (2.5-25 ms), on the temperature of a modeled human hair. Results indicate that immediately after IPL irradiation, the temperature distribution is highly non-uniform within the hair. Average follicle temperature increases linearly with IPL fluence, while longer pulse duration results in reduced follicle temperature. This work provides a numerical tool for clinical management of IPL epilation aiming at optimal treatment outcomes..
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