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目的 :探讨螺旋CT三维重建技术在大肠癌外科术前诊断中的价值。材料和方法 :选 2 0例有低张气钡灌肠造影及病理证实的大肠癌 ,行低张充气螺旋CT扫描 ,表面覆盖显示 (SSD)、容积漫游技术 (VRT)、多平面重组 (MPR)等三维重建 ;另 10例行常规及低张注生理盐水CT检查。本法与造影、常规CT、低张注水CT及手术、病理对照观察。结果 :常规CT检出率为 4/ 10 ;低张注水CT检出率为 7/ 10 ;低张气钡灌肠造影检出率为 2 0 / 2 0 ;螺旋CT三维重建检出率为 2 0 / 2 0。前三者在检出率或观察内容上均有各自限度 ,后者可弥补。结论 :SSD、VRT可显示 6mm隆起病变和 3mm管腔狭窄 ,VRT可显示 1mm细沟凹陷 ;MPR对轻微的肠壁增厚、僵硬很敏感 ,能准确判断病灶外侵程度 ;SSD酷似内窥镜 ,VRT可比低张气钡灌肠造影 ,SCT三维重建可一法多用。
Objective: To investigate the value of spiral CT three-dimensional reconstruction in the preoperative diagnosis of colorectal cancer. MATERIALS AND METHODS: Twenty patients with colorectal carcinoma with low-contrast barium enema and pathology were selected. Low-inflatable helical CT scan, surface coverage display (SSD), volumetric roaming (VRT), multiplanar reconstruction And other three-dimensional reconstruction; the other 10 routine routine and low-stretch injection of saline CT examination. The law and contrast, conventional CT, low-cut water injection CT and surgery, pathological control observation. Results: The detection rate of conventional CT was 4/10, the detection rate of low-tension water injection CT was 7/10, the detection rate of low-tension barium enema was 20/20, and the detection rate of three-dimensional reconstruction by spiral CT was 20 / 2 0. The first three in the detection rate or content of the observations have their own limits, the latter can make up. CONCLUSIONS: SSD and VRT can show 6mm bulge lesions and 3mm lumen stenosis. VRT can show 1mm narrow groove depression. MPR is sensitive to mild intestinal wall thickening and stiffness, which can accurately determine the degree of invasion of lesions. SSD resembles endoscopic , VRT than barium low barium enema, SCT three-dimensional reconstruction can be a multi-purpose method.