TOTAL INHOMOGENEITY CORRECTION INCLUDING CHEMICAL-SHIFTS AND SUSCEPTIBILITY BY VIEW ANGLE TILTING
TOTAL INHOMOGENEITY CORRECTION INCLUDING CHEMICAL-SHIFTS AND SUSCEPTIBILITY BY VIEW ANGLE TILTING
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DOI：
10.1118/1.596162
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发表时间：
1988-01-01
期刊：
影响因子：
3.8
通讯作者：
KIM, YK
中科院分区：
文献类型：
--
作者：
CHO, ZH;KIM, DJ;KIM, YK
本文提出了一种校正总磁场不均匀性效应的方法，包括局部化物体引起的化学位移和磁化率等不均匀性，并通过实验证明了这种方法的有效性。利用这种新的和简单的技术，所有的不均匀性引起的伪影可以同时校正。该方法的基本思想是，以倾斜视角的方式，在与阅读梯度一致的情况下添加与选择梯度相同幅度的补偿梯度。因此，所有的不均匀性引起的几何位移，因此强度变化被校正，因为增加的补偿，这是独立于场的不均匀性，包括化学位移和磁化率。这种技术已在理论上进行了研究，并通过实验证明了它的实用性。
A correction technique of the total magnetic field inhomogeneity effects including the localized object induced inhomogeneities such as chemical shift and susceptibility is developed and its usefulness is experimentally demonstrated. With this new and simple technique all the inhomogeneity induced artifacts can be corrected simultaneously. The basic idea of this method is to add a compensation gradient of the same amplitude as the selection gradient in simultaneity with the reading gradient in such a way that the view angle is tilted. Thereby all the inhomogeneity induced geometrical shifts and hence the intensity changes are corrected, since the addition of the compensation which is independent from the field inhomogeneities including both chemical shifts and susceptibility. This technique has been theoretically examined and its usefulness is demonstrated by experiments.