Szumowski J, Coshow W R, Li F, Quinn S F
Department of Diagnostic Radiology, Oregon Health Sciences University, Portland 97201.
Radiology. 1994 Aug;192(2):555-61. doi: 10.1148/radiology.192.2.8029431.
TO present an algorithm for performing phase unwrapping for fat and water signal separation in the three-point Dixon (3PD) method of magnetic resonance (MR) imaging.
The algorithm is based on a two-dimensional region-growing approach, which tracks phase evolution in 3PD images and unwraps the phase when a 2 pi jump is detected. The unwrapped phase data are consecutively used to calculate fat and water signal components on a per-pixel basis. The method was tested in eight volunteers.
The algorithm creates four output images: standard spin-echo, fat suppression, water suppression, and phase map images. This method corrects for the effects of magnetic field inhomogeneities and provides spatially uniform fat signal suppression superior to that achievable with the standard method.
This method of 3PD data reconstruction appears to be promising for routine application of fat suppression MR imaging in a clinical setting.
提出一种用于磁共振（MR）成像三点狄克逊（3PD）法中脂肪与水信号分离的相位展开算法。
该算法基于二维区域生长法，追踪3PD图像中的相位演变，并在检测到2π跳变时展开相位。展开后的相位数据依次用于逐像素计算脂肪和水信号分量。该方法在8名志愿者身上进行了测试。
该算法生成四张输出图像：标准自旋回波、脂肪抑制、水抑制和相位图图像。此方法校正了磁场不均匀性的影响，并提供了空间均匀的脂肪信号抑制效果，优于标准方法所能达到的效果。
这种3PD数据重建方法在临床环境中用于脂肪抑制MR成像的常规应用似乎很有前景。
