PROSET序列对腰骶神经根变异的显示价值：与MRM序列对照分析

目的：观察和探讨磁共振脊髓造影（MRM）和选择性激励技术（PROSET）序列对腰骶神经根变异（LSNRA）的显示价值及其影像表现。方法：采用常规MRI序列、3D MRM及3D PROSET序列扫描108例腰腿痛患者，MRM及PROSET序列所得图像均行3D最大密度投影重建（3D-MIP）；结合原始图像及3D-MIP图像观察双侧腰骶神经根的解剖形态及走行方向。结果：在获得优良图像的105例病例中，MRM、PROSET序列分别发现LSNRA 7例和14例，发现率分别为6.67%和13.33%，两者差异具有显著性（χ2=5.143，P=0.016）；而常规MRI序列仅发现LSNRA 3例，发现率仅为2.86%。所发现的14例变异中，Ⅱ型变异10例，占71.43％，其中Ⅱ-1型4例，占28.57%，Ⅱ-2、Ⅱ-3、Ⅱ-4型各2例，各占14.29%；Ⅲ型及Ⅵ型变异各2例，各占14.29%。结论：PROSET序列对硬膜外神经根变异的显示明显优于MRM序列，为硬膜外LSNRA的诊断提供了一种全新的方法。

Value of the PROSET sequence in the detection of lumbosacral nerve root anomalies:compare with the MRM sequence

Objective:To explore the application value and findings of MR myelogram (MRM) sequence and PROSET se- quence in the detection of lumbosacral nerve root anomalies (LSNRA). Materials and Methods: Conventional MRI, 3D MRM and 3D PROSET sequences were performed in lumbosacral nerve roots of 108 cases with low back pain. 3D maximum inten- sity projection (3D-MIP) reconstruction was used in PROSET and MRM sequences. The lumbosacral nerve roots were observed in the raw images and 3D-MIP images. Results: In the 105...