双体位CT仿真结肠镜的临床应用

目的探讨体位对结肠隆起性病变CT仿真结肠镜(CTvirtualcolonoscopy,CTVC)成像的影响。方法56例患者行结肠直肠螺旋CT检查,并进行工作站后处理,分别获得结肠、直肠的CTVE、表面遮盖显示(SSD)、容积再现(VR)及多平面成像等二维、三维图像,并于临床病理对照。将病灶按直径≤5mm、5mm~10mm、≥10mm分为3组,分析双体位下CTVC对病灶的检出率。结果增生性息肉4例,腺瘤8例,多发性息肉3例,结肠、直肠癌31例。双体位下病灶检出率较仰卧位提高,双体位下大肠扩张满意度高。结论采用双体位能有效提高结肠隆起性病变的CTVC成像效果。结合其他后处理方法,能明显提高CTVC病灶的检出率。

The Clinical Study of CT Virtual Colonoscopy Effect of Scanning in Both the Supine and Prone Positions

Objective To evaluate the effectiveness of CT virtual colonoscopy for colorectal masses in both the supine and prone positions. Methods Sixteen approximately 20-cm-long sections of fresh pig colon were resected as experimental model with 6 artificial mass lesions ranging from 2 mm to 10 mm in diameter per section. Spiral scanning was performed after appropriately distended by introduction of air and water. Each section was scanned twice. Simulated polyps were located the distal and proximal wall alternatively to study the imaging effect and detection rate in two positions. Results Helical CT of the colorectal tract was applied to 56 patients with post-processing on the workstation. CTVC,SSD,VRand MPR images were obtained. Conclusion Use of multi-positions scanning improves imaging effect and detection rate of CT virtual colonoscopy for colorectal masses.