Enhanced gray and white matter contrast of phase susceptibility-weighted images in ultra-high-field magnetic resonance imaging
Enhanced gray and white matter contrast of phase susceptibility-weighted images in ultra-high-field magnetic resonance imaging
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DOI：
10.1002/jmri.10362
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发表时间：
2003-09-01
影响因子：
4.4
通讯作者：
Chakeres, DW
中科院分区：
文献类型：
--
作者：
Abduljalil, AM;Schmalbrock, P;Chakeres, DW
目的：评价磁化率敏感相位后处理图像是否可用于增强8-特斯拉(T)磁共振梯度回波（GE）图像的固有脑/灰质对比。材料与方法：建立高分辨率GE MR 8-T图像的相位和幅度图像。比较了震级；幅值和相位的乘积，以及纯相位图像。结果：纯相位图像明显提高了脑灰质和白质结构的对比度。一般来说，铁含量或亚体素场不均匀性越高，对比度越高，相移越大。相位图像最好地显示了在标准量级图像上不明显的解剖结构。结论：相对于标准量级的高场GE成像技术，相位成像能明显改善脑内部解剖结构的显示。
Purpose: To evaluate if magnetic susceptibility sensitive phase postprocessed images can be used to enhance the inherent brain/gray white matter contrast in gradient echo (GE) images at 8-Tesla (T) magnetic resonance (MR).Materials and Methods: Phase and magnitude images of high-resolution GE MR 8-T images were created. Comparisons were made between the magnitude; the product of the magnitude and phase, and pure phase images.Results: The pure phase images significantly improved the contrast between the gray and white matter structures. In general, the higher the iron content or subvoxel field inhomogeneities, the higher was the contrast, and the greater were the resultant phase shifts. The phase images best demonstrated anatomy that was not apparent on the standard magnitude images.Conclusion: Phase imaging can significantly improve the demonstration of the internal anatomical brain structures over standard magnitude GE imaging techniques at high field.