CT仿真内窥镜检查时仰卧位和俯卧位对充气结肠扩张度影响的研究

目的 探讨CT仿真结肠内窥镜(CT virtual colonoscopy，CTVC)检查时仰卧位和俯卧位扫描对充气结肠扩张度的影响。方法 30例患者进行结肠镜检查之前进行了结肠CTVC检查，并进行了仰卧位和俯卧位扫描肠管扩张度的评分；比较不同体位下结肠扩张度的差异。结果 对结肠肠段而言，仰卧位和俯卧位时分别有26段(17％)和22段(15％)结肠肠段扩张不足，双体位下仅仅有5段(3％)肠段扩张不足；对结肠而言，仰卧位和俯卧位分别有15例(50％)和13例(43％)的结肠扩张不足，双体位时则下降至5例(17％)；直肠、乙状结肠和横结肠在内不同体位中的扩张度差异具有显著性意义。结论 CTVC中进行仰卧位和俯卧位扫描对于保证结肠的充分扩张是极为必要的；横结肠在仰卧位时扩张较佳，而直肠、乙状结肠在俯卧位时具有更好的扩张度。

Effect of scanning in the supine and prone positions on dilation of air-charged colon in CTVC

Objective To evaluate the effect of scanning in the supine and prone positions on dilation of air-charged colon in CT virtual colonoscopy (CTVC). Methods Thirty cases underwent CTVC scanning in both the supine and prone positions immediately before colonoscopy, and the dilation of each intestine was graded. The differences of colon dilation in different positions were compared. Results In supine and prone position, there were 26 (17.3%) and 22 (14.7%) insufficient dilating colon segments, respectively, and only 5 (3.3%) insufficient dilating colon segments in double positions. 15(50.0%)and 13(43.3%)colons dilated insufficiently in supine and prone position, respectively, and decreased to 5 (16.7%) in double positions. The dilation of rectum, sigmoid colon, and transverse colon had significant difference in different positions. Conclusion When performing CTVC, it is highly necessary to scan in both the supine and prone positions in order to ensure the sufficient dilation of colon. In supine position, the dilation of transverse colon is better, while the dilation of rectum and sigmoid colon in prone position is superior to that in supine position.