体位对CT仿真结肠镜成像影响的实验研究

The Experimental Study of CT Virtual Colonoscopy;Effect of Scanning In Both the Supine and Prone Positions

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:取长约20cm的猪结肠16段,每段制作直径2mm^10mm的息肉模型各6个。结肠适度充气并注入1mm^2mm高的水后,行螺旋CT扫描。每一肠段均扫描2次,使模拟病灶分别位于近地壁和远地壁上。分析两种位置下CTVC病灶的显示效果和检出率。结果:远地壁上模拟息肉显示效果优于近地壁上(Uc=5.998,P<0.01);远地壁上模拟息肉检出率高于近地壁上(分别为100%和75%)(χ2=27.43,P<0.01)。结论:多体位扫描提高了结肠隆起性病变的CTVC显示效果和检出率。

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 2mm to 10mm 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 The imaging effect of the distal wall was better than that of the proximal wall （uc = 5. 998 ,P 〈 0.01 ）. Detection rate of simulated polyps was 100% ,75% in the distal and proximal wall,respectively（x^2 = 27. 43, P 〈 0.01 ）. Conclusion Use of multl-positions scanning improves imaging effect and detection rate of CT virtual colonoscopy for colorectal masses.