Abstract
To investigate the effect of pulsing on neodymium-YAG laser-induced hyperthermia we have exposed rat liver to low-power Nd-YAG laser light delivered via an interstitially inserted fibre. This was either continuous wave excitation or pulsed excitation at 10 or 40 Hz (pulse duration 100μs) with an average power of 1W and exposure durations of 400 s. No differences were seen with respect to overall diameter of the histological damage, diameter of the central cavitation, or intrahepatic temperatures, as measured by an embedded array of microthermocouples. We conclude that with 100-μs pulses, within the range of parameters studied, the pulsing rate does not influence the nature or the extent of damage seen after low-power interstitial Nd-YAG laser hyperthermia.
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