摘要
目的 评价回顾性电影法心电门控多层螺旋CT(ECG-MSCT)肺部扫描的作用。资料与方法 选取2000年7月～2001年6月间行肺部CT检查者50例,男36例,女14例。其中最高心率为88次/min,最低心率为58次/min,平均72.8±12次/min。采用GE Light Speed多层螺旋CT机和SUN图像工作站完成所有病例的检查。首先行常规HRCT扫描,随后只对需要作对比的层面进行同部位ECG-MSCT扫描,并以产生搏动性伪影最明显处的肺实质图像为主要观察对象。将心电门控扫描图像转至工作站进行图像后处理,由3位放射科医师分别进行盲法阅片作同层面图像质量比较。对所有图像质量采用评分方法进行评价。结果 通过同层ECG-MSCT图像和常规HRCT图像伪影评分的比较,发现两者有显著性差异(P<0.001)。心脏搏动双重伪影出现率有明显减少(P<0.05);双轨征出现率也显著减少(P<0.05);星状伪影消除率为60％,较常规HRCT有明显改善(P<0.01)。采用ECG-MSCT和常规HRCT扫描,对消除呼吸运动伪影方面,两者无显著性差异(P>0.05)。结论 ECG-MSCT扫描方法简便易行,可明显消除心脏搏动伪影、双轨征及常见的星状伪影,从而提高了图像的诊断质量,减少由于伪影而造成的误诊。
Objective To evaluate retrospective cine ECG-gated multislice CT (ECG-MSCT) scanning in reducing cardiac motion artifacts and in improving image quality of the lung. Materials and Methods Conventional HRCT and ECG-MSCT scanning was performed in 50 cases on a GE scanner (Light Speed QX/i). The patients' heart rates ranged from 58 to 88 per minute (mean 72.8±12 beat/min) . Using 10 mm scan interval and 1×1.25 mm collimator, two rotation scans with time overlapping technique for one plane and 10 ~ 15 planes for one person were used. The observation was focused on the pulmonary parenchyma where the pulsation artifacts were most obvious. The scanning data were input to the workstation, where the post-processing of the images was automatically completed. Using blind method, the image quality was evaluated by three radiologists. Artifacts of different kind between conventional HRCT scann and ECG-MSCT scan were compared. Results ECG-MSCT scanning significantly reduced artifacts caused by cardiac motion, which presented as distortion of pulmonary vessels, double-tract sign and blurred cardiac border. And a statistic difference in the presence of artifacts due to cardiac motion existed between ECG-MSCT and conventional CT scanning ( P < 0. 01) . No significant difference in eliminating respiratory artifacts was found between two scanning techniques (P>0.05). Conclusion ECG-MSCT scanning technique is simple, it can eliminate commonly seen artifacts due to cardiac motion, thus, improve the image quality.
出处
《临床放射学杂志》
CSCD
北大核心
2003年第8期666-669,共4页
Journal of Clinical Radiology
