Schmidt O, Widmaier S, Bunse M, Jung W I, Dietze G J, Lutz O
Physikalisches Institut, University of Tübingen, Germany.
MAGMA. 2000 Jul;10(3):167-70. doi: 10.1007/BF02590642.
In chemical shift resolved spectroscopic imaging (CSI) temporal changes in the static magnetic field (drift) can lead to distortions of the phase encoding process. This can result in localization artifacts. The extent of the artifact depends on the size of the drift, the number of acquisitions, as well as on the combination of the size of the field of view and the number of phase encoding gradient steps. Furthermore, it is affected by the succession of the phase encoding gradients. Precautions are described which allow substantial minimization of the artifact.
在化学位移分辨光谱成像（CSI）中，静磁场的时间变化（漂移）会导致相位编码过程出现失真。这可能会产生定位伪影。伪影的程度取决于漂移的大小、采集次数，以及视野大小与相位编码梯度步数的组合。此外，它还受相位编码梯度顺序的影响。文中描述了一些预防措施，可大幅减少伪影。
