中文摘要：

目的 ：对比运动矫正相位敏感反转恢复序列（PSIR SSFP MOCO）与快速扰相梯度回波相位敏感反转恢复序列（PSIR segmented）在磁共振心肌延迟增强中的优势。方法 ：回顾56例同时采用PSIR segmented（PSIR segmented组）和PSIR SSFP MOCO（PSIR SSFP MOCO组）两种扫描方式行磁共振心肌延迟增强扫描的患者的影像资料,对比分析两组图像的主观质量评分（4级）,并配对对比分析两组中正常心肌、异常强化心肌及左心室腔内图像的信噪比和相对信噪比。结果 ：PSIR segmented组图像质量主观评分结果：4分、3分、2分和1分组依次占28.6%、41.1%、28.6%和1.8%。PSIR SSFP MOCO组图像质量主观评分为4分的比例为96.4%,显著高于PSIR segmented组（P〈0.001）,3分占3.6%,1分或2分均为0%。PSIR SSFP MOCO组图像正常心肌信噪比（4.70±3.47 vs 3.64±3.2,P=0.074）、异常心肌信噪比（52.58±36.58 vs 27.65±18.47,P〈0.001）及左心室血池的信噪比（40.52±33.97 vs 23.14±11.46,P〈0.001）均高于PSIR segmented组。PSIR SSFP MOCO组图像异常强化心肌与正常心肌的相对信噪比（47.46±33.97 vs 23.75±16.68,P〈0.001）、异常强化心肌与左心室血池的相对信噪比（8.53±17.77 vs 4.54±10.10,P=0.181）及左心室血池与正常心肌的相对信噪比（35.82±25.72 vs 19.49±9.44,P〈0.001）也均显著高于PSIR segmented组。结论 ：与PSIR segmented序列相比,采用PSIR SSFP MOCO序列能够获得更高比例的高质量心肌增强延迟图像。

英文摘要：

Objective： To compare the image quality between motion-corrected of phase sensitive inversion recovery SSFP （PSIR SSFP MOCO ） sequences and segmented phase sensitivity inversion recovery turbo fast low angel shot PSIR （PSIR segmented turbo Flash） sequences in MRI myocardial enhancement. Methods： A total of 56 patients with PSIR segmented and PSIR SSFP MOCO for myocardial enhancement were retrospectively studied. Subjective quality score （gradel-4）, signal to noise ratio （SNR） and relative SNR of normal myocardium, abnormal enhancement of myocardium and left ventricular chamber images were paired and compared between 2 different LGE techniques. Results： Subjective quality scores in PSIR segmented group were as 4 points 28.6%, 3 points 41.1%, 2 points 28.6%, 1 point 1.8% respectively. In PSIR SSFP MOCO group, 4 points was 96.4% which was higher than PSIR segmented group, P〈0.001, 3 points 3.6%, 2 points and 1 point were both 0%. The following SNRs were higher in PSIR MOCO SSFP group than PSIR segmented group as in normal myocardium （4.70±3.47） vs （3.64±3.2）, P=0.074; in abnormal myocardium （52.58±36.58） vs （27.65±18.47）, P〈0.001 and in left ventricular chamber （40.52±33.97） vs （23.14±11.46）, P〈0.001 respectively. The following relative SNRs were higher in PSIR MOCO SSFP group than PSIR segmented group as in normal to abnormal myocardium （47.46±33.97） vs （23.75±16.68）, P〈0.001; abnormal myocardium to left ventricular chamber （8.53±17.77） vs （4.54±10.10）, P=0.181 and left ventricular chamber to normal myocardium （35.82±25.72） vs （19.49±9.44）, P〈0.001 respectively. Conclusion： Compared with PSIR segmented sequence, PSIR SSFP MOCO teelmique can obtain better quality of delay-enhanced myocardial images.