Feinberg D A, Crooks L E, Sheldon P, Hoenninger J, Watts J, Arakawa M
Radiologic Imaging Laboratory, University of California, San Francisco 94080.
Magn Reson Med. 1985 Dec;2(6):555-66. doi: 10.1002/mrm.1910020606.
Encoding the precession phase angle of proton nuclei for Fourier analysis has produced accurate measurement of fluid velocity vector components by MRI. A pair of identical gradient pulses separated in time by exactly 1/2 TE, are used to linearly encode the phase of flow velocity vector components without changing the phase of stationary nuclei. Two-dimensional Fourier transformation of signals gave velocity density images of laminar flow in angled tubes which were in agreement with the laws of vector addition. These velocity profile images provide a quantitative method for the investigation of fluid dynamics and hemodynamics.
通过对质子核的进动相位角进行编码以用于傅里叶分析，已利用磁共振成像（MRI）精确测量了流体速度矢量分量。一对在时间上精确相隔1/2 TE的相同梯度脉冲，用于对流速矢量分量的相位进行线性编码，而不改变静止核的相位。对信号进行二维傅里叶变换得到了成角度管道中层流的速度密度图像，这些图像与矢量相加定律相符。这些速度剖面图像为研究流体动力学和血液动力学提供了一种定量方法。
