屏气不佳患者胸部螺旋CT扫描方法探讨

The Study of Scanning Techniques of Thoracic Spiral CT in Patients with Bad Breath

目的探讨屏气不佳患者胸部螺旋CT扫描的最佳方案。方法临床检查中出现屏气不佳的患者300例,采用GE公司单排/双排螺旋CT进行胸部扫描。扫描技术包括从肺底扫描至肺尖、充分吸氧、根据屏气持续时间调整相关扫描参数、缩短扫描时间、连续扫描及标准重建。由2位高年资的影像科医生对其图像质量进行评价。结果采用上述扫描方法,282例患者能在单次屏气中完成整个肺部扫描,图像质量好;18例患者在扫描后期屏气效果不佳,但对肺上部的图像质量影响不大,图像质量可。结论根据屏气持续时间调整相关扫描参数和从肺底开始向肺尖扫描的检查方法,可减少屏气不佳患者呼吸运动伪影的影响,具有较高的临床实用价值。

Objective To investigate the optimal protocol of thoracic spiral CT scanning in patients with bad breath. Methods 300 patients with bad breath, underwent thoracic scanning with GE single or dualetector spiral CT. The scanning techniques were as follows： covering from the base to the lung apex： intaking oxygen sufficiently; adjusting associated scanning parameters according to the duration of breath-hold; shortening scanning time： continuous scanning and standard reconstruction. The image quality were evaluated by two experienced radiologists. Results 282 cases were performed by single breath-hold and the image quality were good： the breath-hold of 18 cases were unsatisfactory during the later stage of scanning, however which had little influence on the image quality of upper lung and they were adequate. Conclusion The scanning methods of adjusting associated scanning parameters according to the duration of breath-hold and covering from the base to the lung apex, which can reduce influence on respiratory motion artifacts in patients with bad breath. So it＇s a practical and valuable method in clinical thoracic spiral CT scanning.