不同形状连续激光辐照皮肤组织温度场数值模拟

Numerical Simulation of Temperature Distribution in Skin Tissue Generated by Different Shape Continuum Laser

本文基于生物组织热传导方程,分析了连续平顶型激光和连续高斯型激光辐照皮肤组织的热传递规律,建立了更为接近细胞尺寸的三层皮肤组织模型,采用有限元方法对两种不同形状激光作用于皮肤组织时产生的温升情况进行了数值模拟,仿真研究了不同作用时间、不同表面距离和不同深度的皮肤组织温度场分布。结果表明,相同条件下,由连续平顶型激光在组织内部产生的最高温度明显小于高斯型的,主要原因是平顶型激光能量分散,而高斯型能量相对集中。连续高斯型激光辐照组织后产生的温升区域面积和穿透深度均较大,撤去激光后达到初始温度的冷却时间也相应较长。

The rule of heat transfer that is irradiated by plane peak continuum laser and gauss continuum laser are analyzed based on thermal conduction equations of biological tissue. The three layer skin tissue model that is more closely to cell size is built. The transient temperature distribution in skin tissue generated by two different shape la-sers is numerical simulated using finite element method. The temperature field of skin tissue in the circumstances dif-ferent action time and exterior distance and depth is studied respectively. The results show that the highest tempera-ture in the skin tissue generated by plane peak continuum laser is less than gauss continuum laser’s on the same con-ditions. The reason is which energy of plane peak continuum laser is decentralizing and energy of plane peak continu-um laser is centralizing. The area and penetrating depth of temperature rise generated by gauss continuum laser is big-ger. The cooling time of achieving elementary temperature is longer corresponding when the laser is removed.