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0 引言胃肠道肿瘤一向以钡剂检查和内镜及内镜下活检为主要手段,但在CT出现约20a间内,CT技术发展日新月异,新的成像方法不断涌现,随着CT新技术在临床的推广应用,CT在胃肠道肿瘤诊断中的作用日显突出。 1969年Housefield发明了CT以来,许多研究者不断尝试用CT诊断胃肠道肿瘤,但早期则常规CT扫描速度慢和图像分辨率低,常规CT一直作为钡餐和内镜的补充检查手段。1989年,单层螺旋CT(SCT)的出
0 Introduction Gastrointestinal neoplasms have always been treated with tinctures and endoscopy and endoscopic biopsy. However, in the presence of CT within about 20 years, the development of CT technology is changing with each passing day, and new imaging methods are emerging. With the new CT technology, The clinical application of CT has played a prominent role in the diagnosis of gastrointestinal cancer. Since Housefield invented CT in 1969, many researchers have continued to use CT to diagnose gastrointestinal tumors. However, early routine CT scans were slow and the image resolution was low. Conventional CT has been used as a supplementary examination method for barium meal and endoscopy. In 1989, the output of single-slice spiral CT (SCT)