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Porcine skin thermal response to near-IR lasers using a fast infrared camera

We have measured the Minimum Visible Lesion (MVL) thresholds for porcine skin and determined the ED50 for exposures at 1314 nm and 0.35 ms laser pulses. An in-vivo pigmented animal model, Yucatan mini-pig (Sus scrofa domestica), was used in this study. We also have measured the thermal response using a high-speed Infrared camera for single pulse temperature recordings for Gaussian beams of 1 mm diameter. Several 2-D measurements of temperature as a function of time were made with an IR array detector thermal camera using a sampling rate of 100 frames per second. In Vitro samples of the same pig skin were used for measurements of the optical properties (absorption coefficient, μa, and reduced scattering coefficient μs) as a function of wavelength around 1315 nm wavelength. A measured surface temperature distribution for one IR laser pulse of 0.37J at a spot size of 1.2 mm diameter gave approximately a 43° C rise at a hot spot. Temperature distributions as a function of time and space will be presented and compared with the measured thresholds.