【摘要】 目的：探讨螺旋ＣＴ，ＣＴＶＥ显示结肠隆起性病变的价值。材料与方法：取长约２５ｃｍ猪结肠２段制作３～１２ｍｍ直径大小之结肠隆起性病变各 １０个，共 ２０个。结肠适度充气后选准直层厚 ３ｍｍ、重建层厚１． ５ｍｍ、螺距 １０行螺旋ＣＴ扫描．在工作站用导航软件作内窥镜成像后处理。结果： ＣＴＶＥ检出全部 ２０个病灶，敏感性 １００％；其中 ８个（ ４０％）病灶显示极好， １２个（６０％）病灶显示好；但显示病灶表面粘膜细节无结肠镜好；无假阳性及阴性结果。结论： ＣＴＶＥ为可靠探查３ｍｍ以上结肠隆起性病变并获得结肠镜效果的有效方法。更多还原

【Abstract】 Purpose: To assess virtual colonoscopy with helical CT for detection of simulated mass lesions in pig colon. Materials and Methods: Two approximately 25-cm-long sections of fresh pig colon in vitro were resected to created 10 mass lesions ranging from 3mm to 12mm in diameter per section. Spiral scanning was performed after appropriately distended by introdnction of air. Images were obtained with collimation of 3mm, and with table pitch of 1.0. Colonoscopelike images were reformated by navigator software on a workstation (GE Advantage Windows 2.0) based volume source imaging data. Results: All twenty mass lesions were clearly defined on the virtual colonoscopic images, and the sensitivity of CTVE for detection of colon mass was 100 %. The image of 8(40 % ) lesions was graded as excellent, and of 12 (60 % ) lesions was as good. The image quality of coloscope was better than that of CTVE. There was none poor grade image, and no false-positive or false-negative findings. Conclusion: CT virtual colonoscopy provide noninvasively endoscopelike display of the colon without inserting an instrument, and permit identification of colonic mass lesions as small as 3mm in diameter.更多还原