胃肠道充气螺旋CT的窗口技术

Proper Spiral CT Window for the Stomach and Colon

目的 探讨CT显示胃肠道及其病变的最适宜窗口。方法 随机选取 5 0例行胃肠道充气螺旋CT检查者断面图像 68帧 ,在四种不同窗宽窗位下 ,观察六个指标的显示情况。结果 第③窗 (窗宽为 180～ 2 80Hu ,窗位为 -2 0～ +2 0Hu)时 ,直径约 0 .3～ 0 .5cm细小结节或小血管断面 ,软组织内密度对比 ,脂肪与软组织对比的显示为优 ,气体与脂肪的对比、胃肠腔轮廓及软组织形态轮廓方面显示较好 ,可不同程度兼顾到所需观察的多种组织 ,较好显示胃肠道及其病变。结论 窗宽 180～ 2 80Hu ,窗位 -2 0～ + 2 0Hu ,是观察胃肠道的较适宜窗口。

Objective To study the proper window for stomach and colon. Methods Sixty eight slice images randomly selected from 50 patients underwent insufflation and volume scan were observed under four kinds of window widths and centers. Results The gas,fat and soft tissue could be shown under the third window(width:180 to 280Hu,center:-20 to +20Hu).The difference between fat and soft tissue,inter soft tissue was clear.And the form was nature and intact.So the third window could show the stomach and colon and their lisions more easily. Conclusion The window with width 180～280Hu,center-20～+20Hu was a proper one for gastroenterology.