Effects of focusing and multibeam on laser light propagation in tissue and its thermal response

• Main Authors: Yi-Shian Lin, 林宜憲
• Other Authors: Chih-Yang Wu
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/36248335055918282891

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 92 === 　　The purpose of this research is to examine the light propagation and the thermal response in tissues with different ways of laser-light delivering. In this work, we take the port wine stain as an example, and adopt a simple skin model. To obtain the energy deposition, we use the Delta Monte Carlo method to simulate the light propagation. Then we solve the heat conduction equation to obtain the temperature distribution. Finally, we use the Arrhenius rate process equation to get the thermal injury for each time step. 　　The results show that using the convex lens can increase the deposited energy in the blood vessel and the epidermis, but reduce the ratio of deposited energy in the blood vessel and the epidermis. The multibeam projection of laser can increases the deposited energy of the blood vessel without increasing the deposited energy of the epidermis too much. In the temperature and damage distribution aspect, under the requirement without destroying the epidermal tissues, the results show that the treatment by using multibeam with lens focusing is better than that using single focusing lens.