摘要
目的:探讨应用双源CT对心房纤颤(AF)患者进行冠状动脉成像的可行性及心率对图像质量和重建时相的影响。方法:对29例临床可疑冠心病的AF患者进行双源CT增强扫描。29例患者按扫描时平均心率分成2组,慢心率组(<80次/分)12人,快心率组(≥80次/分)17例。利用回顾性心电门控重建图像,以4级记分评价图像质量。比较慢心率组与快心率组的图像质量评分采用t检验。结果:慢心率组和快心率组的图像质量评分分别为(1.26±0.55)和(1.49±0.77)分,差异有统计学意义(t=-3.433,P<0.01)。慢心率组的最佳重建时相约一半出现在舒张期,快心率组的最佳重建时相多出现在收缩期。总体上29例患者97.4%的冠状动脉节段可以评价。结论:拥有高时间分辨力的双源CT能够为大部分房颤患者提供可评价的图像,心率对图像质量和重建时相有影响。
Objective：To evaluate the performance of dual source computed tomography （DSCT） in the visualization of the coronary arteries in a population with atrial fibrillation （AF） and the impact of patients heart rate （HR） on image quality （IQ） and reconstruction timing. Methods： Twenty-nine patients （ 10 male, 19 female; mean age 69.2±10. 1 years） with suspected coronary artery disease and AF were routinely imaged on a DSCT scanner （120kV,400mAs,0.33s-rotation time, 64×0.6 mm collimation, pitch 0.20 -0.28, Siemens Somatom Definition）. Patients were divided into two groups： low HR group （HR（80bpm,n= 12） and high HR group （HR≥80bpm,n= 17）. Each dataset was reconstructed in all cardiac phases with 50-msec intervals. IQ of all coronary segments was assessed using a four-point grading scale from excellent （1） to non assessable （4）. Results： The mean heart rate during examination ranged from 54 to 110bpm （mean 82. 6±16.0 bpm）. Mean IQ was significantly better in low HR group （1.26±0.55） than in high HR group （1.49±0. 77）,t=-3.433, P〈0.01. The optimal phase was half in diastole in low HR group,while that is mostly in systole in high HR group. Totally, IQ of optimal images was diagnostic in 97.4 % of all the segments. Conclusion： DSCT with high temporal resolution pro vides diagnostically valuable images in most patients with AF. HR had impact on IQ and reconstruction timing.
出处
《放射学实践》
2008年第8期831-834,共4页
Radiologic Practice
