MAXIMIZING UNAMBIGUOUS VELOCITY RANGE IN PHASE-CONTRAST MRI WITH MULTIPOINT ENCODING.
MAXIMIZING UNAMBIGUOUS VELOCITY RANGE IN PHASE-CONTRAST MRI WITH MULTIPOINT ENCODING.
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DOI：
10.1109/isbi52829.2022.9761589
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发表时间：
2022-03
期刊：
影响因子：
--
通讯作者：
Potter, Lee C.
中科院分区：
文献类型：
--
作者：
Zhao, Shen;Ahmad, Rizwan;Potter, Lee C.
在相衬磁共振成像（PC-MRI）中，一个体素的自旋速度在图像相位中被编码。速度编码梯度的强度提供了速度噪声比（VNR）和相位混叠程度之间的权衡。相位差提供了对未知背景相位的不变性。现有文献建议处理一组简化的相位差方程，以牺牲VNR或未变化的速度范围为代价简化相位展开问题，或两者兼而有之。在这里，我们证明了最大的无二义速度范围是平行六面体，可以通过联合处理所有相位差来访问。联合处理也最大限度地提高了速度噪声比。对无二义平行六面体的简单理解为分析新的多点采集提供了潜力，以增强未混淆速度的范围；给出了两个例子。
In phase-contrast magnetic resonance imaging (PC-MRI), the velocity of spins at a voxel is encoded in the image phase. The strength of the velocity encoding gradient offers a trade-off between the velocity-to-noise ratio (VNR) and the extent of phase aliasing. Phase differences provide invariance to an unknown background phase. Existing literature proposes processing a reduced set of phase difference equations, simplifying the phase unwrapping problem at the expense of VNR or unaliased range of velocities, or both. Here, we demonstrate that the fullest unambiguous range of velocities is a parallelepiped, which can be accessed by jointly processing all phase differences. The joint processing also maximizes the velocity-to-noise ratio. The simple understanding of the unambiguous parallelepiped provides the potential for analyzing new multi-point acquisitions for an enhanced range of unaliased velocities; two examples are given.
DOI：
10.1002/jmri.1880010404
发表时间：
1991-07-01
期刊：
JMRI-JOURNAL OF MAGNETIC RESONANCE IMAGING
影响因子：
--
作者：
PELC, NJ;BERNSTEIN, MA;GLOVER, GH
通讯作者：
GLOVER, GH
影响因子：
3.3
作者：
Rich, Adam;Potter, Lee C.;Ahmad, Rizwan
通讯作者：
Ahmad, Rizwan
影响因子：
3.3
作者：
Johnson, Kevin M.;Markl, Michael
通讯作者：
Markl, Michael