Nozokido T, Yamamoto E, Kohno H, Yamamoto S
Central Research Laboratory, Hitachi, Ltd., Tokyo, Japan.
Magn Reson Med. 1991 May;19(1):161-9. doi: 10.1002/mrm.1910190114.
Proton chemical-shift imaging with the elimination of three kinds of artifacts caused by main magnetic field inhomogeneities, susceptibility distributions of imaging objects, and the electromagnetic properties of radiofrequency (RF) fields is presented in this paper. In addition, the last of these artifacts, which is dependent upon the conductivity distributions of objects, especially in high-tesla imaging, is also demonstrated experimentally. The method proposed here enables the reconstruction of artifact-free water/fat separation images by using simple image data manipulations without the complicated phase-unwrap process, even with main magnetic field inhomogeneities larger than the chemical-shift difference between water and fat magnetizations.
本文介绍了一种质子化学位移成像方法，该方法可消除由主磁场不均匀性、成像对象的磁化率分布以及射频（RF）场的电磁特性引起的三种伪影。此外，还通过实验证明了这些伪影中的最后一种，它取决于对象的电导率分布，特别是在高场成像中。本文提出的方法能够通过简单的图像数据处理重建无伪影的水/脂分离图像，而无需复杂的相位展开过程，即使主磁场不均匀性大于水和脂肪磁化之间的化学位移差。
