摘要
目的：探讨16层螺旋CT仿真内窥镜检查10mm以下不同大小的猪结肠模拟息肉的敏感性以及充气压力的选择。方法：猪结肠40cm 24段。每段制作1～2mm、3～4mm、5～6mm、7～8mm、9～10mm息肉模型5枚。24段猪结肠随机分为A、B、C 3组，每组8段。3组分别注入37.5mmHg、52.5mmHg、67.5mmHg压力的气体。每段猪结肠均行3个角度扫描，即猪结肠纵轴与扫描架平面成0°、45°、90°角。结果：不同角度、压力下息肉检出的敏感性较高，没有显著性差异。仅在气压为37.5mmHg时1～2mm的息肉检出的敏感性为75.0%，其它均为100％。结肠充气的3种压力37.5mmHg与52.5mmHg和67.5mmHg之间，结肠袋深距有显著性差异，52.5mmHg与67.5mmHg之间无显著性差异。结论：16层螺旋CT对1～2mm、3～4mm、5～6mm、7～8mm、9～10mm的息肉检出有较高的敏感性。建议52.5mmHg的气压应作为CT仿真内窥镜充气的首选压力。CT扫描时应始终维持这个压力，直到扫描结束。
Abstract
Objective: To access the ability and the optimal gas pressure of 16-MDCT virtual endoscopy in detection of simulated polyps with different sizes in pig colon. Methods: Twenty-four pieces of 40cm-long colon were divided into 3 groups randomly with the gas pressure of 37.5, 52.5 and 67.5mmHg. Each piece of colon had 5 simulated polyps with the size 1～2mm, 3～4mm, 5～6mm, 7～8mm and 9～10mm. All the pieces of colon underwent CT scanning with the angle of 0°, 45° and 90° to the gantry. Results: There was no significant difference for MDCT in detection of the polyps under different pressures and with different angles. Their sensitivities were all 100% except for the 1～2mm polyps detected under 37.5mmHg with the sensitivity of 75%. The depths of the colonic haustra were different under the above pressures, but there was no difference between 52.5mmHg and 67.5mmHg. Conclusion: The sensitivity of 16-MDCT virtual endoscopy in detection of polyps with the size ranged from 1 to 10mm is high. The optimal gas pressure is 52.5mmHg and it should be kept until the scanning is finished.
关键词
结肠息肉 /
结肠镜检查 /
计算机体层摄影 /
模型 /
动物 /
猪
Key words
colonic polyps /
colonography /
computed tomographic /
models /
animal /
swine
马 巍;赵贵辛;王 啸;冯艳丽;林均会;朱海波.
16-MDCT仿真内窥镜检查猪结肠模拟息肉的实验研究[J]. 中国临床医学影像杂志. 2007, 18(2): 126-129
MA Wei;ZHAO Gui-xin;WANG Xiao;FENG Yan-li;LIN Jun-hui;ZHU Hai-bo.
Experimental study of simulated polyps in pig colon: detection with 16-MDCT virtual endoscopy[J]. Journal of China Clinic Medical Imaging. 2007, 18(2): 126-129
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