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利用沿读出梯度方向的位置偏移进行化学位移成像。

Chemical-shift imaging utilizing the positional shifts along the readout gradient direction.

作者信息

Altbach M I, Trouard T P, Van de Walle R, Theilmann R J, Clarkson E, Barrett H H, Gmitro A F

机构信息

Department of Radiology, University of Arizona, Tucson 85724-5067, USA.

出版信息

IEEE Trans Med Imaging. 2001 Nov;20(11):1156-66. doi: 10.1109/42.963818.

Abstract

In this work, we describe a method that uses the linear phase acquired during the readout period due to chemical shift to generate individual magnetic resonance (MR) images of chemically shifted species. The method utilizes sets of Fourier (or k-space) data acquired with different directions of the readout gradient and a postprocessing algorithm to generate chemical shift images. The methodology is developed for both Cartesian data acquisition and for radial data acquisition. The method is presented here for two chemically shifted species but it can be extended to more species. In this work, we present the theory, show the results in phantoms and in human images, and discuss the artifacts and signal-to-noise ratio of the images obtained with the technique.

摘要

在本研究中,我们描述了一种方法,该方法利用在读出期间由于化学位移而获得的线性相位来生成化学位移物质的单个磁共振(MR)图像。该方法利用以不同读出梯度方向采集的傅里叶(或k空间)数据集和一种后处理算法来生成化学位移图像。该方法适用于笛卡尔数据采集和径向数据采集。这里介绍的方法适用于两种化学位移物质,但可以扩展到更多种。在本研究中,我们阐述了理论,展示了在体模和人体图像中的结果,并讨论了用该技术获得的图像的伪影和信噪比。

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