摘要
目的评价高心率条件下前瞻性心电门控技术结合运动校正算法(SSF)进行低剂量冠状动脉CT血管成像(CCTA)的可行性。方法连续搜集行CCTA检查的疑似冠心病的高心率患者60例,随机选择30例采用回顾性心电门控技术(RGH)扫描,另外30例采用前瞻性心电门控技术(SAS)扫描。RGH组选择冠状动脉显示最佳的时相,行SSF算法重组;SAS组使用SSF算法重组的目标时相选择50%R-R间期。比较RGH组和SAS组内标准算法重组(STD)和SSF算法重组之间的图像质量评分、可诊断率和优良率,以及两组SSF算法重建之间的有效剂量、图像质量评分、可诊断率和优良率。结果 RGH组和SAS组内SSF算法和STD算法重组之间的图像质量评分、可诊断率及优良率的差异均有统计学意义(P=0.000);SAS组的有效剂量为(3.3±1.3)mSv,RGH组的有效剂量为(9.2±1.5)mSv。SAS组和RGH组之间SSF算法重组的图像质量评分、可诊断率以及优良率的差异无统计学意义(P>0.05)。结论在高心率条件下,前瞻性心电门控技术结合SSF算法可以取代回顾性心电门控技术进行CCTA,在降低辐射剂量的同时不损害图像质量。
Objective To assess the feasibility of low-dose prospective ECG-triggering CCTA in conjunction with motion correction algorithm（Snap-Shot Freeze,SSF） in patients with high heart rate. Methods 60 consecutive patients of suspected CAD with high heart rate underwent CCTA. 30 patients were selected to use prospective ECG-triggering（SAS） and the other 30 patients were selected to use retrospective ECG-triggering（RGH） at random form. For the RGH group,the optimal phases of the coronary arteries were selected to generate the images using SSF reconstruction. For the SAS group,the target phase of 50% R-R interval was selected to generate the images using SSF reconstruction. The image quality score,diagnostic rate and excellent rate between standard（STD） and SSF reconstruction in both groups were compared. The effective dose,image quality score,diagnostic rate and excellent rate between the group SAS and RGH using SSF reconstruction were compared. Results The image quality score,diagnostic rate and excellent rate between STD and SSF reconstruction in both groups had statistical significance（P = 0. 000）. The effective dose for SAS and RGH group were（3. 3 ± 1. 3） mSv and（9. 2 ± 1. 5） mSv respectively. However,the image quality score,diagnostic rate and excellent rate between the SAS and RGH group using SSF reconstruction had no statistical significance（P〉0. 05）. Conclusion Prospective ECG-triggering CCTA in conjunction with motion correction algorithm can replace retrospective ECG-triggering in patients with high heart rate and reduced radiation dose without compromise of image quality.
出处
《临床放射学杂志》
CSCD
北大核心
2017年第11期1703-1707,共5页
Journal of Clinical Radiology
基金
湖北省自然科学基金资助项目(编号:2016CFB697)
