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Magnetic resonance imaging of fluid flows using echo-planar technology
Magnetic resonance imaging of fluid flows using echo-planar technology
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机译:使用回波平面技术的流体流磁共振成像
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摘要
A method of magnetic resonance imaging a flowing liquid flowing through a rectangular cross-section column of space, wherein imaging readings are obtained from points throughout the column by utilizing a frequency encoding gradient to define the position of a reading point in the direction of the long axis of the column; defining the position of a reading point in a plane normal to the long axis of the column using one of phase encoding gradients and echo-planar blips; using one of phase encoding gradients and echo-planar blips with odd echoes and even echoes to acquire readings in two distinct regions of k-space; and obtaining readings in each plane normal to the long axis of the column from a 32×32 matrix of reading points using 16 phase encoding steps and 8 echo planar interleaves. Alternatively, the step of obtaining may be accomplished by varying the velocity phase sensitivity of the frequency encoding gradient to achieve a continuously varying phase sensitivity across k-space.
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机译:一种磁共振成像,该成像方法对流过矩形横截面空间列的流动液体进行成像,其中,通过利用频率编码梯度来定义读取点在长边方向上的位置,从整个列中的点获取成像读数柱轴使用相位编码梯度和回波平面波幅之一定义读取点在垂直于列长轴的平面中的位置;使用相位编码梯度和具有奇数个回声和偶数个回声的回声平面斑点之一来获取k空间的两个不同区域中的读数;并使用16个相位编码步骤和8个回波平面交错从32 x 32的读取点矩阵中获得与列的长轴垂直的每个平面中的读数。可替代地,可以通过改变频率编码梯度的速度相位灵敏度以实现跨k空间的连续变化的相位灵敏度来完成获得步骤。
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