结合压缩感知技术与敏感度编码的3D mDixon序列以及3D Vane序列对肝脏成像的影响的对比研究  

A comparative study on the effects of 3D mDixon sequence and 3D Vane sequence on liver imaging by combining the Compressed SENSE technology and SENSE

作　　者：魏强[1] 王家正 伊东娜 许晓昉 宋清伟[1] 浦仁旺[1] 陈丽华[1] 张宇[1] 刘爱连[1] WEI Qiang;WANG Jiazheng;YI Dongna;XU Xiaofang;SONG Qingwei;PU Renwang;CHEN Lihua;ZHANG Yu;LIU Ailian(Department of Radiology,the First Affiliated Hospital of Dalian Medical University,Dalian 116011,China;Philips Healthy(China),Suzhou 215000,China)

机构地区：[1]大连医科大学附属第一医院放射科,大连116011 [2]飞利浦医疗(中国),苏州215000

出　　处：《磁共振成像》2020年第9期781-785,共5页Chinese Journal of Magnetic Resonance Imaging

摘　　要：目的比较结合压缩感知技术与敏感度编码技术的3D mDixon序列以及3D Vane序列在肝脏检查中的应用价值。材料与方法使用3.0 T MR对23名健康志愿者(男性13例,女性10例)分别采用自由呼吸3D Vane、屏气3D mDixon sensitivity encoding(SENSE)与3D mDixon Compressed SENSE(CS,压缩感知)序列进行上腹部MR扫描,按照上述技术分为A、B、C组。由2名观测者分别对肝脏图像质量进行5分制主观评分,并在肝门水平肝脏的肝右叶前、后段和肝左叶内、外段及其相应层面同一相位方向的右侧竖脊肌划定感兴趣区,测量三组图像肝脏及竖脊肌的信号值(signal,SI)、噪声(standard deviation,SD)值,分别计算图像信噪比(signal to noise ratio,SNR)、对比噪声比(contrast to noise ratio,CNR)。分别使用Wilcoxon检验以及卡方检验对三组肝脏肝右叶前、后段和肝左叶内、外段SNR、CNR及三组图像质量评分结果进行组间统计学分析。结果2名观测者对A、B、C三组图像的客观测量数据与图像主观评分的一致性良好(Kappa和ICC值均大于0.75)。三组图像质量评分分别为4.3±0.56、4.7±0.56、4.7±0.56。B、C组图像质量评分均明显高于A组(P<0.05)。三组肝右叶前、后段和肝左叶内、外段的SNR、CNR分别为8.03±3.08、29.25±7.08、29.25±7.08、8.03±3.08;15.75±5.37、43.89±10.30、40.27±12.49、11.37±5.42;16.95±5.48、46.55±10.47、46.56±10.48、16.95±5.48。B、C组图像肝右叶前、后段的SNR、CNR均明显高于A组(P<0.05);C组图像肝左叶内、外段SNR、CNR也均明显高于A组(P<0.05);B、C组间图像肝右叶前、后段、肝左叶内外段的质量评分及SNR、CNR差异均无统计学意义(P>0.05)。3D Vane的扫描时间为111 s;相对于结合SENSE的3D mDixon序列,结合CS的3D mDixon序列扫描时间缩短约15.3%(15.1 s与13.1 s)。结论相对于自由呼吸3D Vane序列,屏气结合SENSE的3D mDixon序列与结合CS的3D mDixon序列能有效提高图像的信噪比、对比Objective:To compare the application value of 3D mDixon sequence and 3D Vane sequence of compressed sense technology in liver examination.Materials and Methods:Twenty-three healthy volunteers(13 males and 10 females)were included,who underwent upper abdominal MRI scanning using free breathing 3D Vane,3D mDixon SENSE and 3D mDixon Compressed SENSE(CS)sequences in the 3.0 T MR scanner.According to the above technologies,they were divided into A,B and C groups.Two observers separately scored the subjective score of liver image quality on a 5-point scale.The regions of interest were placed on the anterior and posterior segments of the right hepatic lobe,the inner and outer segments of the left hepatic lobe,and the right erector spinae.The signal(SI)and standard deviation(SD)values of the liver and erector spinae were measured,and the signal to noise ratio(SNR)and contrast to noise ratio(CNR)were calculated.The Wilcoxon test and the Chi-square test were used to analyze the SNR,CNR,and image quality scores of the anterior and posterior segments of the right liver lobe and the inner and outer segments of the left hepatic lobe of the three groups.Results:The objective measurement data and the subjective image quality scores of the images of group A,B and C by the two observers were in good agreement(all Kappa and ICC values were more than 0.75).Image quality scores in three groups were 4.3±0.56,4.7±0.56,and 4.7±0.56,respectively.The image quality scores in group B and C were significantly higher than those in group A(P<0.05).The SNR and CNR of the anterior and posterior segments of the right hepatic lobe and the inner and outer segments of the left hepatic lobe were 8.03±3.08,29.25±7.08,29.25±7.08,8.03±3.08;15.75±5.37,43.89±10.30,40.27±12.49,11.37±5.42;16.95±5.48,46.55±10.47,46.56±10.48,16.95±5.48,respectively.And the SNR and CNR in the anterior and posterior segments of the right hepatic lobe in group B and C were significantly higher than those in group A(P<0.05).SNR and CNR in the left lobe of the liver

关 键 词：3D mDixon 压缩感知 肝脏 信噪比 对比噪声比 

分 类 号：R445.2[医药卫生—影像医学与核医学] R657.51[医药卫生—诊断学]