压缩感知-mDIXON、精准频率反转恢复与短时反转恢复技术在腰椎MR扫描中的应用  

Application of compressed sensing-mDIXON,spectrally attenuated inversion recovery and short-time of inversion recovery techniques in lumbar MR scanning

作　　者：刘鹏 牛美晨 刘宏 LIU Peng;NIU Meichen;LIU Hong(Department of CT/MR,Fuyang People's Hospital,Fuyang 236000,China;Thirteenth Ward,the Third People's Hospital of Fuyang,Fuyang 236000,China;Department of Rehabilitation,the Fifth People's Hospital of Fuyang,Fuyang 236000,China)

机构地区：[1]阜阳市人民医院CT/MR室,安徽阜阳236000 [2]阜阳市第三人民医院十三病区,安徽阜阳236000 [3]阜阳市第五人民医院康复科,安徽阜阳236000

出　　处：《分子影像学杂志》2024年第3期304-310,共7页Journal of Molecular Imaging

摘　　要：目的 研究压缩感知(CS)联合m DIXON技术、精准频率反转恢复(SPAIR)技术与短时反转恢复(STIR)技术在腰椎MR抑制脂肪效果的应用价值。方法 选取2023年9月7日~2024年1月9日在阜阳市人民医院因腰椎疾病行MR检查的60例患者,分别进行CS-mDIXON、SPAIR与STIR技术的矢状位T2WI扫描。由2名医师采用5分制对3组图像质量进行主观评价;定量对比测量时在L2、L5椎体及L1/2、L5/S1椎间盘4组图像层面正中及相关空气区域放置感兴趣区,分别测量信号强度及噪声强度标准差,计算信噪比(SNR)及对比噪声比(CNR)。结果 主观评分一致性良好(Kappa系数值>0.75)。CS-mDIXON技术在多种评价方面的分值均优于SPAIR技术与STIR技术(P<0.05)。在L2、L5椎体层面中,3组技术信号值、噪声值依次增大,差异有统计学意义(P<0.001),CS-mDIXON的SNR值及CNR值大于SPAIR和STIR技术,差异有统计学意义(P<0.001);在L1/2、L5/S1椎间盘层面中,CS-mDIXON技术的信号强度分别小于后两组,差异有统计学意义(P<0.001)。3组噪声值依次增大,SNR值、CNR值依次减小,差异有统计学意义(P<0.001)。结论 腰椎MR扫描中,CS-mDIXON技术抑制脂肪的效果更好,同时又可减少扫描时间,可以成为腰椎MR抑脂序列扫描中最好的选择。Objective To study the application value of compressed sensing(CS) combined with mDIXON technique,spectrally attenuated inversion recovery(SPAIR) technique and short-time of inversion recovery(STIR) technique in lumbar MR by suppressing fat.Methods A total of 60 patients with lumbar diseases who underwent MR examination in Fuyang People's Hospital from September 7,2023 to January 9,2024 were selected for sagittal T2WI scans with techniques of CS-mDIXON,SPAIR and STIR.The image quality of the three groups were subjectively evaluated by two doctors using 5-point system.A region of interest was placed in the median position and relevant air area of the L2 and L5 vertebral bodies and L1/2 and L5/S1intervertebral discs.The signal-to-noise ratio(SNR) and contrast-to-noise ratio(CNR) were calculated.Results The subjective scores were consistent(Kappa>0.75).CS-mDIXON technique has better scores than SPAIR technique and STIR technique(P<0.05);At the level of L2 and L5,the signal value and noise value of the three groups increased in turn,and the differences were statistically significant(P<0.001).The SNR and CNR values of CS-mDIXON technique were higher than those of SPAIR and STIR technique,and the differences were statistically significant(P<0.001);At the level of L1/2 and L5/S1,the signal intensity values of CS-mDIXON technique were lower than those of the latter two groups,and the differences were statistically significant(P<0.001).The noise values of the three groups increased in turn,while the SNR and CNR values of the three groups decreased in turn,and the differences were statistically significant(P<0.001).Conclusion In lumbar MR Scanning,CSmDIXON technique has a better effect on fat suppression and reduces the scanning time,and it can be the best choice for the scan of lumbar MR by fat suppressing sequence.

关 键 词：腰椎 脂肪抑制 压缩感知 图像质量 磁共振成像 

分 类 号：R445.2[医药卫生—影像医学与核医学] R681.5[医药卫生—诊断学]