化学饱和法脂肪抑制技术在上腹部MRCP 成像中的应用

目的:探讨化学饱和法脂肪抑制技术在上腹部磁共振检查中的应用。材料与方法:使用的机器为美国马可尼公司生产的Elips 1.5T磁共振成像仪,常规检查上腹部病人,研究对象的条件:在自动匀场时出现单水峰的位置与Y轴不重叠,选择40例病人做两次扫描,第一次是匀场自动完成后进行扫描;第二次是在匀场时通过人为的干预,使得FID最大的水峰调整到Y轴上,提交后进行扫描,对40例的图像进行自配对,比较压脂图像质量。结果:压脂序列图像:自动匀场完成后重T2加权T2/C薄层图像均含有脂肪信号,经最大信号投影重建胰胆管图像也含有脂肪信号,整体图像对比度差;经人工干预手动调节使水峰的最高点与Y轴重叠,扫描所得图像不含脂肪信号。结论:快速动态自动匀场可以使MRI图像质量得到显著改善,在自动匀场时通过人工的干预可获得高质量的压脂图像是必需的。

Nanjing First Hospital of Nanjing Medical University, Division of Radiation Imaging

Objective: To investigate the automatic shimming of the upper abdomen Magnetic Resonance Imaging application.Methods: Using the machine for the American Marconi company’s Elips 1.5T magnetic resonance imaging,routine checks on the abdomen of patients,study conditions: when the automatic shimming more water peak or a single water peak position and Y-axis do not overlap,40 cases were selected to do two scans,the first shim automatically after the scan;second time was when the man in the uniform field adjustment,making the largest water peak FID adjusted to Y axis,the author After scanning the images of 40 patients from the match and compare image quality and image quality pressure grease.Results: The two scans of conventional image quality was of no significant difference;pressure grease image sequences: automatic shimming after heavy T2-weighted T2 / C thin images contain fat signal,the maximum signal by projection reconstruction images also contain fat and pancreatic duct signal The overall image contrast is poor;through human intervention to manually adjust to the highest water peak overlaps with the Y axis,scanning the image obtained without fat signal.Conclusion: The automatic shimming fast dynamic MRI image quality can be significantly improved,when in the automatic shimming of the human intervention available through the pressure of high-quality images is essential fat.