CT仿真结肠镜与其他后处理方法检查结直肠息肉的比较研究

Comparative Study on the Detecting Colorectal Polyps with Virtual Colonoscopy or Other Postprocessing Techniques

目的 比较研究多平面重建 (MPR)、CT仿真结肠镜检查 (CTVC)、表面遮盖显示 (SSD)和透明显示 (Raysum)检查结直肠息肉的临床价值。材料与方法 用螺旋CT机对 2 3例结直肠息肉病例进行容积扫描 ,在工作站应用 4种后处理方法获取MPR、CTVC、SSD和Raysum图像。按息肉大小分 3组及总结果进行统计分析。病变均经常规结肠镜检查 (CC)活检和 /或手术病理证实。结果2 3例共 5 6枚息肉。MPR、CTVC、SSD和Raysum分别检出 12枚≤ 5mm息肉中的 4、6、5和 4枚 ,检出率分别为 33 .3 %、5 0 .0 %、41.7%和 33 .3 % ;检出 2 3枚 6～ 9mm息肉中的 19、2 0、16和 13枚 ,检出率分别为 82 .6 %、86 .9%、6 9.7%和 5 6 .5 % ;2 1枚≥ 10mm息肉均全部检出 ,检出率均为 10 0 %。 4种方法分别检出 5 6枚息肉中的 44、47、42和 38枚 ,总检出率分别为 78.6 %、83 .9%、75 .0 %和 6 7.9%。结论 MPR、CTVC、SSD和Raysum对于≤ 5mm、6～ 9mm息肉和总检出率上有较大差异 ,以CTVC最高。

Objective To compare the clinical value of different postprocessing techniques, including CTVC, MPR, SSD and Raysum, in detecting colorectal polyps.Materials and Methods Volume scanning with a spiral CT was performed in 23 patients with colorectal polyps. CTVC, MPR, SSD and Raysum images were obtained by using four different software on a workstation. According to the sizes and total numbers of the polyps detected, the results with different techniques were compared and analyzed.Results Fifty-six polyps were detected in 23 patients, which, based on their sizes, were divided into 3 groups: (1) ≤5mm (n=12), (2) 6～9mm (n=23), (3) ≥10mm (n=21). For the first group, the total polyp numbers detected by MPR, CTVC, SSD and Raysum were 4 (33.3%), 6(50.0%), 5(41.7%) and 4(33.3%), respectively. For the second group, they were 19 (82.6%), 20(86.9%), 16(69.7%) and 13(56.5%), respectively. All 21 polyps in the third group were revealed (100%). The total detection rate of each of above four techniques was 44 (78.6%), 47(83.9%), 42(75.0%) and 38(67.9%), respectively.Conclusion Considerable difference in detecting colorectal polyps is existed between MPR, CTVC, SSD and Raysum, and CTVC is the most sensitive technique.