摘要
目的:探讨MSCT低剂量肺部扫描的最适宜X线剂量。材料和方法:将随机抽取的80例肺部检查志愿者随机分为四组,分别进行常规剂量(120kV,200mA)和不同低剂量(120kV,10mA,20mA,30mA,40mA)对比扫描,使用随机软件对所得图像进行后处理。从图像噪声、伪影、分辨率,肺组织、纵隔结构显示及病灶、淋巴结检出方面来比较。结果:各不同低剂量组与常规组在组织结构及病灶淋巴结显示方面无显著差异;噪声值均大于常规组,有显著差异(P<0.001)。10mA组噪声、伪影较大,病灶边缘及内部结构显示方面不够理想;但20mA与30mA组之间,30mA与40mA组之间并无显著差异(P>0.05),40mA组与常规组比较各项指标综合评分均无差异(P>0.05)。结论:综合考虑各种因素,30mAMSCT可获得和常规剂量具有相当诊断价值的图像,30mA应为低剂量肺部检查的最适宜X线剂量。
To study the optimal low-dose MSCT on lung scanning. Materials and Methods： 80 volunteers with lung diseases, divided into four groups, were examined by MSCT respectively in standard dose （200mA） and different low-dose （10, 20, 30, 40mA）. Then, by comparing the software-processed images, to analyze the differences among the four groups in image noise, artifact, spatial resolution, the showing of pulmonary parenchyma and mediastinal structure, the detecting rate of pulmonary lesions and mediastinal lymph nodes. Results： No significant difference among the groups in showing of tissue structures, lesions and lymph nodes. However, the difference in images＇ noise was observed between low-dose groups and standard group（P 〈 0.001） . 10mA group＇ s noise and artifact is too heavy to show the border characteristics and internal structure ideally, but there are no obvious differences between 20mAs group and 30mAs, 30mAs and 40mAs （P 〉 0.05）. Nor is comprehensive index between 40mAs group and standard group （P 〉 0.05） . Conclusion ： 30mA low-dose MSCT works almost in the same way as standard one. So, 30mA can be the optimal low-dose MSCT on lung scanning.
出处
《中国医学计算机成像杂志》
CSCD
2005年第6期384-387,共4页
Chinese Computed Medical Imaging
