Susceptibility-weighted imaging: technical aspects and clinical applications, part 1.
Susceptibility-weighted imaging: technical aspects and clinical applications, part 1.
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DOI：
10.3174/ajnr.a1400
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发表时间：
2009-01
期刊：
影响因子：
--
通讯作者：
Cheng YC
中科院分区：
文献类型：
--
作者：
Haacke EM;Mittal S;Wu Z;Neelavalli J;Cheng YC
磁敏感加权成像（SWI）是一种新的神经影像学技术，它利用组织的磁化率差异产生独特的对比度，不同于自旋密度，T1，T2和T2*。在这篇评论（2部分的第一部分）中，我们介绍了SWI的技术背景。我们讨论梯度回波图像的概念，以及如何测量局部磁化率的变化。有了这些材料，我们介绍了将原始幅度和相位图像转换为SWI数据所需的步骤。介绍了使用SWI过滤相作为可视化和潜在量化脑中铁的手段。讨论了正确解释SWI数据的建议，并给出了一组推荐的不同场强的序列参数。
Susceptibility-weighted imaging (SWI) is a new neuroimaging technique, which uses tissue magnetic susceptibility differences to generate a unique contrast, different from that of spin density, T1, T2, and T2*. In this review (the first of 2 parts), we present the technical background for SWI. We discuss the concept of gradient-echo images and how we can measure local changes in susceptibility. Armed with this material, we introduce the steps required to transform the original magnitude and phase images into SWI data. The use of SWI filtered phase as a means to visualize and potentially quantify iron in the brain is presented. Advice for the correct interpretation of SWI data is discussed, and a set of recommended sequence parameters for different field strengths is given.