背景光动力学疗法(PDT)是一种治疗癌症的新方法。它基于两个因素,一个是光敏剂,另一个是与这种光敏剂吸收光谱相匹配的相应波长的光。光敏剂注入人体并代谢一段时间后,在肿瘤组织中的浓度要比在正常组织中高,此时若用相应波长的激光照射患处,可对肿瘤组织进行靶破坏。PDT的主要 Background Photodynamic therapy (PDT) is a new approach to the treatment of cancer. It is based on two factors, one is the photosensitizer and the other is the light of the corresponding wavelength that matches the absorption spectrum of this photosensitizer. After the photosensitizer is injected into the human body and metabolized for a period of time, the concentration of the photosensitizer in the tumor tissue is higher than in the normal tissue. At this time, if the corresponding wavelength laser is used to irradiate the affected area, the target tissue can be destroyed. The main PDT