摘要
目的研究16层螺旋CT低剂量扫描对肺容积、肺密度定量分析的影响。方法本研究共选择100例患者,根据CT扫描方法的不同分为3组。A组20例,一次屏气常规剂量(220mA×0.8s)和60mAs低剂量MSCT部分肺段扫描,纵向扫描范围3cm;B组60例,深吸气末及深呼气末60mAs低剂量MSCT全肺扫描。C组20例,一次屏气40mAs和80mAs低剂量MSCT部分肺段扫描,纵向扫描范围3cm。结果常规剂量和60mAs以上低剂量扫描图像质量均为优秀,能够满足肺容积和肺密度定量分析的需要。低剂量扫描测得的部分肺容积较常规剂量小,在标准重建下有非常显著性差异(P<0.01),在骨重建下具有显著差异(P<0.05);低剂量扫描测得的平均肺密度略高于常规剂量测量结果,但差异无显著性(P>0.05)。结论16层螺旋CT肺容积和肺密度检测中,60mAs低剂量扫描能够满足图像定量分析的需要。
Objective To study the effect of low dose scanning of 16-slice CT in quantitative analysis of lung volume and density. Methods One hundred patients were included and divided into three groups. In 20 cases of group A, partial lung segments, 3 cm longitudinally, were scanned with conventional dose （220 mA×0.8 s） and 60 mAs low dose during one breathhold. In 60 cases of group B, whole lungs were scanned with 60 mAs low dose at full inspiration and full expiration. In 20 cases of group C, partial lung segments, 3 cm longitudinally, were scanned with 40 mAs low dose and 80 mAs low dose. Results The image quality was excellent in both conventional dose scanning and ≥60 mAs low dose scanning, and could meet the requirements of lung volume and density quantitative analysis. The partial lung volume measured with low dose scanning was smaller than with conventional dose scanning, there was highly significant difference （P〈0.01）. The mean lung density measured with low dose scanning was slightly higher than with conventional dose scanning, but the difference was insignificant （P〉0.05）. Conclusion In the detection of lung volume and density using 16-slice CT, low dose scan of 60 mAs can meet the requirements of quantitative analysis.
出处
《中国医学影像技术》
CSCD
北大核心
2007年第10期1491-1494,共4页
Chinese Journal of Medical Imaging Technology
