低磁场MRCBASS在颈椎椎间盘病变中的应用价值

The application of CBASS sequence at low field MR in the diagnosis of cervical spine disc diseases

目的 :探讨CBASS序列在低磁场MR颈椎椎间盘病变诊断中的应用价值。方法 :在低磁场MR上对 39例颈椎分别行普通FE(GRE)T2 加权序列、普通FSET1加权序列及CBASS序列的 3mm薄层横断扫描 ,重建图像请有经验的放射科医生采用双盲法进行评价 ,评价内容包括椎间盘、蛛网膜下腔、椎间盘与蛛网膜下腔脑脊液之间界限显示情况 ,评价标准分三个等级。另外 ,对图像显示的椎间盘与蛛网膜下腔脑脊液的组织对比噪声比进行定性测量。结果 :CBASS序列无论在显示椎间盘、蛛网膜下腔、椎间盘与蛛网膜下腔脑脊液之间界限都明显好于普通SE、FE(GRE)T1或T2 、T2 加权序列。CBASS序列不仅信噪比极高 ,对流动不敏感 ,而且扫描时间大大缩短。结论 :CBASS序列在颈椎椎间盘横断薄层扫描中具有重要的应用价值 ,在低磁场MR上值得推广。

Objective:To study the application of completely balanced acquisition in steady state sequence at low field MR in the diagnosis of cervical spine and disc diseases.Methods:Completely balanced acquisition in steady state (CBASS) sequence ,normal FE(GRE)T 2* weighted sequence and normal FSE T 1 weighted sequence were performed at low field MR on 39 patients intervertebral disc of transverse scanning. Experienced radiologists evaluated the images,they were unknowing which method the images were. The evaluations included all detail information of the intervertebral disc、the subarachnoid space and the place between the intervertebral disc and the subarachnoid space. Contrast-to-noise of the place between the intervertebral disc and the subarachnoid space were measured.Results:BZ]CBASS sequence displayed the structure of intervertebral disc、the subarachnoid space 、the place between the intervertebral disc and the subarachnoid space better than normal FE (GRE) T 2* weighted sequence and normal FSE T 1 weighted sequence.The signal noise ratios of CBASS sequence was high. The scan time of CBASS sequence was shorter than that of normal FE (GRE) T 2* weighted sequence and normal FSE T1 weighted sequence.Conclusion:BZ]It was significance to use the CBASS sequence in the diagnosis of cervical spine intervertebral disc diseases which need transverse scanning, especially at low field MR.