弥散加权神经成像在臂丛神经成像中的参数优化

Optimal parameters of diffusion weighted magnetic resonance neurography of brachial plexus

目的探讨弥散加权背景抑制神经成像(DWIBS)不同扫描参数对臂丛神经图像质量的影响,优选最佳扫描参数。方法将18名健康志愿者等分为3组,对第一组每名志愿者行3个b值的弥散加权成像扫描。选择成像质量最好的b值,调整分辨率,对第二组行弥散加权成像。选择第二组成像质量最好的参数组合,调整并行采集因子分别为2、4、8,对第三组行弥散加权成像。观察不同b值、不同参数下的臂丛神经解剖细节和成像质量。结果 NEX为8、层厚3mm、b值为300s/mm2、分辨率158×158、并行采集因子为4的冠状位图像能够分辨臂丛神经的干股束支等解剖细节,图像质量较好。结论优化后的DWIBS能满意显示臂丛神经,可作为臂丛神经成像的常规序列之一。

Objective To explore influence of different scanning parameters of diffusion weighted whole body imaging with background body signal suppression（DWIBS） on image quality of brachial plexus,and to select the best scanning parameters.Methods Eighteen healthy volunteers were equally divided into 3 groups.The first group were scanned with three b values.Then,the b value with best image quality in the first group combined with different resolution were used for the second group.As for the third group,the scanning parameter with best quality of images in the second group were used combined with different iPat factor（2,4,8）.The anatomical details of brachial plexus and the imaging quality were observed.Results When NEX 8,slice thickness 3 mm,b value=300 s/mm2,resolution=158×158,iPat factor=4,the coronal image could distinguish anatomical details of brachial plexus and its branches,and the image quality was better than the others.Conclusion DWIBS after optimization has ability to show the brachial plexus.It can be used as one of conventional sequences in the brachial plexus imaging.