压缩感知不同加速因子对心脏磁共振电影序列成像质量的影响  

Effects of Different Acceleration Factors of Compressed Sensing on the Imaging Quality of Cardiac Magnetic Resonance Cine Sequences

作　　者：王林林 贺克武 赵韧[2] 俞宏林 孙若愚 钱银锋[3] 李小虎[3] 余永强[3] WANG Linlin;HE Kewu;ZHAO Ren;YU Honglin;SUN Ruoyu;QIAN Yinfeng;LI Xiaohu;YU Yongqiang(Department of Medical Imaging,the First Affiliated Hospital of Anhui Medical University,Hefei 230022,China)

机构地区：[1]安徽医科大学第三附属医院(合肥市第一人民医院)影像中心,安徽合肥230000 [2]安徽医科大学第一附属医院心血管内科,安徽合肥230022 [3]安徽医科大学第一附属医院医学影像科,安徽合肥230022

出　　处：《中国医学影像学杂志》2024年第6期581-586,共6页Chinese Journal of Medical Imaging

基　　金：安徽省自然科学基金(202304295107020028)。

摘　　要：目的 探讨不同加速因子的压缩感知(CS)技术对心脏磁共振电影序列图像质量的影响及临床应用的可行性。资料与方法 前瞻性招募合肥市第一人民医院2021年1—7月40名健康志愿者进行心脏磁共振成像,扫描方案共4组(采用SENSE 2及加速因子分别为3、4、8的CS心脏电影序列),每组成像方案包括四腔心、左心室短轴、左心室两腔心及三腔心序列,对比4种方案的图像质量主观评分、左心室心功能及16节段心肌厚度。结果 以SENSE 2图像为标准评分(5分),CS3、CS4评分均在3分以上,CS8评分均在3分及以下,其中CS3与SENSE 2序列的四腔心及左心室短轴图像质量主观评分差异无统计学意义(P均>0.05);左心室两腔心及三腔心各序列组图像质量主观评分差异均有统计学意义(P均<0.05)。4种成像方案的左心室心功能(左心室射血分数、左心室收缩末期容积、左心室舒张末期容积、左心室每搏输出量、左心室舒张末期心肌质量)(F=0.027、0.182、0.057、0.140、0.545)与心肌厚度(F=0.052~7.366)各组间差异均无统计学意义(P均>0.05)。结论 基于CS技术的心脏电影序列具有良好的应用前景。随着加速因子的增加,扫描时间逐渐减少,相应的图像质量降低,而当加速因子为4(与常规电影序列相比扫描时间减少50%)时,仍能够准确进行左心室心功能及心肌厚度测量,且图像质量基本满足诊断需求。Purpose To explore the effect of compressed sensing(CS)technique with different acceleration factors on the quality of cardiac magnetic resonance cine sequences and feasibility of clinical application.Materials and Methods From January to July 2021,40 healthy volunteers were prospectively recruited for cardiac magnetic resonance cine imaging in Hefei First People's Hospital.Four scan protocols of volunteers were designed:SENSE 2 and CS-cine sequences with acceleration factors of 3,4 and 8.The imaging slices include four chamber heart,short axis heart,left ventricular two chamber heart and three chamber heart.Subjective score of image quality,left ventricular cardiac function and 16-segment myocardial thickness of SENSE 2 and CS3,CS4 and CS8 were compared and analyzed.Results Taking SENSE 2 image as the standard score of 5,the scores of CS3 and CS4 were above 3,and the scores of CS8 were below 3.There was no significant difference between the scores of four chamber heart and short axis heart images of CS3 and SENSE 2 sequence(all P>0.05).There were statistically significant differences in the subjective scores of image quality between the left ventricular two chamber heart and three chamber heart groups of each sequence(all P<0.05).There was no statistically significant difference in left ventricular function(left ventricular ejection fraction,left ventricular end systolic volume,left ventricular end diastolic volume,left ventricular stroke volume,left ventricular end-diastolic mass)(F=0.027,0.182,0.057,0.140,0.545)and myocardial thickness(F=0.052-7.366)among the four imaging schemes(all P>0.05).Conclusion Cardiac cine based on compressed sensing technology have good application prospects.With the increase of acceleration factors,the scanning time gradually decreases,and the corresponding image quality will also decrease.When the acceleration factor is 4,that is,the scanning time of the conventional cine sequence is reduced by 50%,the left ventricular function and myocardial thickness can still be accurately measu

关 键 词：心脏磁共振 压缩感知技术 图像质量评估 心室功能 左 心肌厚度 

分 类 号：R445.2[医药卫生—影像医学与核医学] R331.31[医药卫生—诊断学]