ENCODING STRATEGIES FOR 3-DIRECTION PHASE-CONTRAST MR IMAGING OF FLOW
ENCODING STRATEGIES FOR 3-DIRECTION PHASE-CONTRAST MR IMAGING OF FLOW
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DOI：
10.1002/jmri.1880010404
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发表时间：
1991-07-01
期刊：
影响因子：
--
通讯作者：
GLOVER, GH
中科院分区：
文献类型：
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作者：
PELC, NJ;BERNSTEIN, MA;GLOVER, GH
提出了利用相衬磁共振成像测量任意方向流速的三种编码策略；通过理论分析和计算机模拟的方式比较了它们的噪声和动态范围性能。就单位时间的速度方差而言，六点测量策略被证明是相当低效的。简单的四点法表现出相同的动态范围；其噪声取决于流向，但平均与六点法相同。另一种平衡四点方法的噪声与方向无关，并且根据实现的不同，噪声水平可能较低。任一四点方法都更有效，并且优于六点方法。
Three encoding strategies for the measurement of flow velocities in arbitrary directions with phase-contrast magnetic resonance imaging are presented; their noise and dynamic range performance are compared by means of theoretical analysis and computer simulation. A six-point measurement strategy is shown to be quite inefficient in terms of velocity variance per unit time. A simple four-point method exhibits equal dynamic range; its noise depends on flow direction but on average is equal to that of the six-point method. Am alternate, balanced four-point method has noise that is direction independent and has, depending on implementation, possibly lower noise levels. Either four-point method is more efficient and is preferred over the six-point approach.