【摘要】 目的探讨螺旋CT仿真内窥镜对大肠息肉的诊断价值和临床意义。方法18例有反复便血、慢性腹泻、腹痛的病人行1次屏气全结肠容积扫描，重叠重建图像并输至工作站进行四维容积重建（4Dangio），选择导航者（Voyager）软件和合适阈值及透明度，航进观察大肠黏膜。全部资料经纤维结肠镜和（或）手术证实。结果18例中发现大肠息肉9例，均为多发，共检出息肉71枚，直径2～20mm，其中升结肠1枚，结肠肝曲2枚，横结肠3枚，降结肠及乙状结肠18枚，直肠47枚。除1例直肠内息肉由于液体滞留影响部分息肉检出外，所见息肉大小、表面形态和数目与手术和结肠镜观察到的病变基本相仿，敏感性达82．56％。结论螺旋CT仿真内窥镜可以较准确地检出大肠息肉及明确其部位，从而为临床提供较可靠的诊断依据。更多还原

【Abstract】 Objective To evaluate spiral CT virtual colonoscopy (SCT VC) for detction of colorectal polyps. Methods Spiral CT (SCT)was performed in 18 patients with breath holding. All data sets acquired with 4 - 5mm collimation and overlapping reconstruction 50% - 70% form SCT were transferred to workstation, and various opacities were assigned to generate SCYVC view. The results of SCT VC were confimed by fibreoptic colonaseopy and(or)surger. Results SCTVC deected 71 colorectal polyps in 9 patients. One polyp was flat,while the others were sessile with dimnsion from 2 mm to 13 mm excepe 1 with 20 mm. Polyps <4 mm appeared blurred but some were seen clearly. Poyps > 5 mm were well delineated and the number, size, morphology, and exact location could be ascertained. The sensitivity of SCTVC for polyp detection was > 82%. Conclusion SCTVC is a reliable, rapidly evolving technology that provides computer-simulated endoscopic visualization of the colonic polyps.更多还原