Dumoulin C L, Souza S P, Walker M F, Wagle W
GE Research and Development Center, Schenectady, New York 12301.
Magn Reson Med. 1989 Jan;9(1):139-49. doi: 10.1002/mrm.1910090117.
Bipolar flow-encoding gradients can be used in a three-dimensional magnetic resonance imaging procedure to provide a noninvasive measure of in vivo blood flow. The resulting volume angiogram is a three-dimensional data matrix which can be retrospectively analyzed and displayed in a variety of ways. This angiographic technique provides good suppression of signals arising from stationary tissue, thereby permitting the visualization of small vessels having relatively slow flow. This suppression is obtained by modulating the amplitude of the flow-encoding gradient pulse to either cancel the stationary tissue signal or displace it relative to the flow signal in the volume image.
双极流动编码梯度可用于三维磁共振成像程序，以提供体内血流的非侵入性测量。所得的容积血管造影是一个三维数据矩阵，可进行回顾性分析并以多种方式显示。这种血管造影技术能有效抑制静止组织产生的信号，从而使血流相对缓慢的小血管得以可视化。通过调节流动编码梯度脉冲的幅度来消除静止组织信号或使其在容积图像中相对于血流信号发生位移，从而实现这种抑制。
