多层螺旋CT胸部常规扫描参数的优化研究

Study of the optimal scanning parameter for the chest conventional multislice spiral CT examination

[目的]优化多层(4层)螺旋CT胸部常规扫描参数.[方法]采用不同扫描参数给60例正常成年人进行胸部CT扫描,A组采用8.0 mm采集层厚、3.5 mm螺距、8.0 mm重建层厚,B组采用5.0 mm采集层厚、6.0 mm螺距、8.0 mm重建层厚,对获得的轴位和后处理图像进行对照分析和评价.[结果]B组参数匹配可获取较高质量的肺纹理及纵隔图像,降低辐射剂量,延长X线管球寿命,但对肺门伪影及图像噪声的产生有一定影响.[结论]采集层厚5.0 mm,螺距6.0 mm,重建层厚8.0 mm是4层螺旋CT胸部常规检查效果较佳的参数匹配.

OBJECTIVE To study the optimal scanning parameter in chest conventional 4 slice spiral CT scanning.METHODSThe chests in 60 normal adults had examined by CT scanning with following two parameters: 8.0mm thickness,a pitch of 3.5 and 8.0mm reconstruction slice thickness in group A;5.0mm thickness,a pitch of 6.0 and 8.0mm reconstruction slice thickness in group B.RESULTSThe group B had significantly advantage than group A on getting high quality image of lung markings and mediastinum,degrading motion artifact,p...