运动相位纠正技术与节段法相位技术在磁共振心肌延迟增强中的对比研究

Comparison of Motion-corrected of Phase Sensitive inversion Recovery and Segmented Phase Sensitivity Inversion Recovery in MRI Myocardial Enhancement

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。

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.