目的:探讨16层螺旋CT低剂量胸部扫描在小儿气道异物检查中的应用价值.方法:对48例经纤维支气管镜证实有气道异物的患儿行不同荆量检查,其中28倒为低剂量(30 mAs)扫描,20例为常规(100 mAs)剂量扫描,将轴位薄层原始数据传至工作站分别行多平面重组(MPR)、最小密度投影(MinIP)、容积再现(VR)及CT仿真内镜(CTVE)后处理重建成像、分析其敏感性和准确性.结果:28例低剂量扫描患儿中发现异物27例,诊断准确率为96.4%;20例常规刺量扫描患儿中发现异物20例,诊断准确率为100%.两者无显著性差异(P>0.05).结论:16层螺旋CT低剂量胸部扫描不仅减少小儿接受的辐射剂量,后处理图像重建后可清楚显示异物的部位、形态、大小及阻塞部位,是诊断小儿气道异物无创并实用的检查方法.%Objective To discuss the value of low-dose chest 16-slice spiral CT scan in the examination of foreign hodies in bronchi of children. Methods Forty-eight children with foreign bodies aspiration were scanned transversely and reconstructed in different doses of the line check, twenty-eight were scanned witb low-dose, the others were scanned with conventional dose. Then the original axial data were transferred to workstation for image reconsruction by multi-planar reconstruction (MPR), minimum intensity projection (MinIP), volume rendering (VR) and CT virtual endoscopy (CTVE) respectively. The sensitivity and accuracy were analyzed. Results Twenty-seven cases were diagnosed with foreign bodies in those scanned with low-dose, diagnostic accuracy was 96.4％. Twenty cases were diagnosed with foreign bodies diagnostic accuracy was 100％. The difference was not statistically significant (P＞0.05). Conclusion Low-dose chest 16-slice spiral CT scan can not only reduce the radiation dose received but also clearly show the site, the shape and the size of foreign body, and even the position of obstruction after post-processing image reconstruction. It is a non-invasive and practical diagnostic technique in the examination of foreign hodies in bronchi of children.[Chinese Medical Equipment Journal, 2011 , 32( 5 ) : 67-68]
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