IDEAL序列在臂丛神经扫描方案中的对比研究

Comparison of IDEAL sequences in scanning protocols of brachial plexu

目的对比分析3.0 T MRI上IDEAL、3D-FIESTA-c、STIR序列在臂丛神经显示中的表现,确定最佳扫描方案。材料与方法对20名健康志愿者行双侧臂丛神经MR冠状位扫描,扫描序列包括IDEAL序列及对比3D-FIESTA-c、STIR序列。3种序列通过主观观察评分、客观测量计算SNR、CNR两方面进行对比。结果 IDEAL序列具有稳定可靠的脂肪抑制能力,可以获得多重的图像对比,显示臂丛神经节后段图像上与STIR序列相比,信噪比更高,神经与周围组织对比更高,神经走行显示更清晰、准确;节前神经显示,在清晰度及对比度上较3D-FIESTA-c序列稍差,但能满足诊断要求。结论 IDEAL可以取代STIR、3D-FIESTA-c序列,作为扫描臂丛神经的常规序列。

Objective：To compare display performances of the 3.0 T MRI for the IDEAL, 3D-FIESTA-c, and STIR sequences of the brachial plexas, and optimize the best scanning solution. Materials and Methods：20 healthy volunteers were recruited and underwent bilateral brachial plexus MR scan coronally through MRI, including IDEAL sequence as well as comparative 3D-FIESTA-csequence and STIR sequence. SNR and CNR of the three sequences were compared respectively by subjective observation and objective measurements. Results： IDEAL sequence has stable and reliable fat suppression effect, and can obtain multiple contrasts. Compared with the STIR sequence, images displayed by the IDEAL sequences for the postganglionic segment of the brachial plexus has higher SNR and tissue contrast against the surrounding nerves, and the images of nerves are clearer and more accurate. However, displayed images for the preganglionic nerves a little weaker in sharpness and contrast compared with the 3D-FIESTA-c sequence, but it still meets the diagnostic requirements. Conclusion：IDEAL can be used as a substitute scanning sequence of the brachial plexus to replace the STIR and 3D-FIESTA-c sequences.