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内镜激光诊断消化道肿瘤研究，有助于早期定位及指示正确的活检部位［1］。激光诊断癌肿主要经静脉注射光敏剂血叶琳衍生物（HPD）后，利用癌肿对HPD选择性摄取或储留的特性，经激光照射肿瘤组织吸收的HPD，能发射红色荧光用于诊断；也可不注射任何光敏物质，通过检测癌肿的自
Endoscopic laser diagnosing digestive tract tumors helps early positioning and indicates the correct biopsy site [1]. The laser diagnosis of cancer is mainly performed by intravenously injecting the photosensitizer hematolin derivative (HPD), using the characteristics of the cancer to selectively uptake or store HPD, the HPD absorbed by the tumor tissue after laser irradiation can emit red fluorescence for diagnosis Can also be injected without any light-sensitive substances, by detecting cancer