MR-PROSET序列观察腰骶神经根(节)解剖

Observation of L_1-S_1 lumbosacral nerve roots and dorsal root ganlias with MR-PROSET sequence

目的评价磁共振选择性水激励脂肪抑制技术(MR-PROSET)在显示腰骶神经(节)中的价值。方法采用3DPROSET序列扫描健康受试者30例,所得原始图像行3DMIP后处理,结合原始图像及MIP图像观察腰骶神经根(节)的形态和走行,并测量相关解剖数据。结果PROSET序列图像能清晰显示L1～S1水平的神经根鞘、神经节以及L3～S1水平的节外段神经;L1～2水平的节外段显示稍差。L1～L5水平的神经根鞘长度逐渐增加,而S1水平的神经根鞘长度较L5水平稍短。L1～S1水平的神经根鞘直径、神经节长径、宽径以及面积均自上而下逐渐增加;神经根鞘倾斜角则自上而下逐渐减小。结论MR-PROSET序列能清晰显示腰骶神经根(节)的解剖形态。

Objective To study the value of MR-PROSET in the demonstration of the lumbosacral nerve roots and dorsal root ganlias（DRGs）.Methods PROSET sequence and 3D maximum intensity projection（3D MIP）post-processed were performed in 30 healthy volunteers without low back pain.The L1-S1 lumbosacral nerve roots and DRGs were observed in the raw pictures and 3D MIP pictures.The related values were measured in the 3D MIP pictures.Results L1-S1 nerve root sleeves,DRGs and L3-S1 segments of the nerves posterior to the ganglions were demonstrated well,while L1-L2 segments of the nerves posterior to the ganglions were not demonstrated excellently.The length of the nerve roots increased progressively to a maximum at L5,and decreased at S1.The diameter of the nerve roots,length,midpoint width and area of the DRGs gradually increased from L1-S1,whereas the nerve root sleeve angulation decreased progressively.Conclusion MR-PROSET sequence can display the lumbosacral nerve roots and DRGs clearly.