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    • 11. 发明授权
    • Flow-induced artifact elimination in magnetic resonance images
    • 磁共振图像中的流感神经消除
    • US5438992A
    • 1995-08-08
    • US146393
    • 1993-11-01
    • John M. Siegel, Jr.David N. KuJohn N. OshinskiRoderic I. Pettigrew
    • John M. Siegel, Jr.David N. KuJohn N. OshinskiRoderic I. Pettigrew
    • G01R33/56G01R33/563A61B5/055
    • G01R33/563G01R33/56
    • Magnetic resonance imaging of a blood vessel exhibits flow artifacts, or signal loss, around a constriction (26) due to turbulent fluid flow. Signal loss in a region (27) prior to the constricted region (26) is primarily caused by convective acceleration, and this signal loss is substantially eliminated by performing an acceleration compensation process. Signal loss in a region (32) situated after the constriction (26) is primarily caused by velocity fluctuations, and this signal loss is cured by an imaging process which does not rely on the phase of the electromagnetic excitation signal(s) for spatial localization. Examples of imaging processes for minimizing signal loss due to turbulence include a projection reconstruction process (34) and a two dimensional slice selection process (56). Further, the two dimensional slice selection process (56) may be used for generating instantaneous velocities of fluid flowing through a fluid channel. Also, if a number of instantaneous velocities are produced over a time period, then fluctuation velocities can be determined via time-resolved averaging.
    • 血管的磁共振成像由于湍流流动而在收缩(26)周围显示出流动假象或信号损失。 在收缩区域(26)之前的区域(27)中的信号损失主要由对流加速度引起,并且通过执行加速度补偿处理基本上消除了该信号损失。 位于收缩(26)之后的区域(32)中的信号损失主要是由速度波动引起的,并且该信号损失通过不依赖于用于空间定位的电磁激励信号的相位的成像过程来固化 。 用于使由湍流引起的信号损失最小化的成像处理的示例包括投影重建处理(34)和二维切片选择处理(56)​​。 此外,二维切片选择过程(56)可用于产生流过流体通道的流体的瞬时速度。 此外,如果在一段时间内产生多个瞬时速度,则可以通过时间分辨平均来确定波动速度。