| 摘要 |
<p>Successful laser treatment of hemangiomas requires selective photocoagulation of subsurface targeted blood vessels without thermal damage to the overlying epidermis. An apparatus for in vivo exposure of laser radiation from a continuous Nd:YAG laser (10) at 1064 nm delivers repetitive cryogen spurts (20), each having a duration of the order of milliseconds during continuous laser irradiation. Control (22) of the cryogen spray colling is achieved through monitoring of the radiometric surface temperature (24) of the tissue site, and either controlling the repetition rate of the cryogen spurts according to temperature, or according to a threshold temperature of the irradiated surface and/or repetition rate of the cryogen spurts according to power density, and the duration of continuous irradiation.</p> |
