两期不同肺动脉CT血管造影术扫描的影像质量对比研究

Comparative study on image quality of two different periods of pulmonary artery CTA scanning

目的对16层螺旋CT肺动脉造影(CTPA)在诊断肺动脉栓塞(PE)时应用智能追踪触发扫描和延时扫描所得的影像质量进行对比分析,探讨CTPA的临床应用价值和技术要点。方法对34例PE患者均采用肺部平扫后,再行智能追踪触发扫描和延时扫描两期肺部CTPA增强扫描,所有的影像资料包括CT征象、图像质量、各级肺动脉的显示率等方面进行综合性分析并做好记录,对其结果进行统计学分析。结果两者在PE直接征象中显示的病灶数方面与图像质量优、良这两个等级的总数方面,智能追踪触发扫描均优于延时扫描(16～21s)。两种扫描方式对于PE的间接征象和肺动脉主干、左右肺动脉、叶及段肺动脉显示率相同,无明显差别。结论智能追踪触发扫描可以精确控制延迟扫描时间,图像质量明显优于延时扫描。

Objective To compare the image quality of 16-slice spiral CT angiography in pulmonary artery（CTPA） for pulmonary embolism（PE） with two ways,including intelligent tracking trigger scanning and delay scan,and to confirm its clinical application value and several CTPA techniques.Methods Thirty-four PE patients were performed CTPA with routine scan,then intelligent tracking trigger scanning and delay scan two lung CTA enhancement scanning.All image data were record,including CT features,displayed rate of different pulmonary artery,and were statistically analyzed.Results The direct signs of pulmonary embolism and image quality in two aspects of intelligent tracking trigger scanning were better than the delay scanning（16-21 s）.Two scan mode for indirect signs and the trunk of the pulmonary artery,right and left pulmonary artery,leaf and segmental pulmonary arteries display rate were the same,with no significant difference.Conclusion Intelligent tracking trigger scanning can precisely control the scan delay time,so its image quality is better than the delay scanning.