Dumoulin C L, Doorly D J, Caro C G
General Electric Corporate Research and Development Center, Schenectady, NY 12301.
Magn Reson Med. 1993 Jan;29(1):44-52. doi: 10.1002/mrm.1910290110.
An MR imaging technique that simultaneously acquires Fourier velocity encoded data from multiple stations is described. The technique employs a comb excitation rf pulse that excites an arbitrary number of slices. As the Fourier velocity phase encoding gradient pulse is advanced, the phase of each slice is the comb is advanced by a unique amount. This causes the signals from the spins in a particular slice to appear at a position in the phase encoding direction, which is the sum of the spin velocity and an offset arising from the phase increment given to that excitation slice. Acquisition of spin velocity information occurs simultaneously for all slices, permitting the calculation of wave velocities arising from pulsatile flow. These wave velocities can then be used to determine vessel distensibility.
描述了一种磁共振成像技术，该技术可同时从多个站点采集傅里叶速度编码数据。该技术采用梳状激励射频脉冲来激发任意数量的层面。随着傅里叶速度相位编码梯度脉冲的推进，梳状结构中每个层面的相位会以独特的量推进。这使得特定层面中自旋的信号出现在相位编码方向上的一个位置，该位置是自旋速度与给予该激发层面的相位增量所产生的偏移量之和。所有层面同时获取自旋速度信息，从而能够计算出由脉动血流产生的波速。然后，这些波速可用于确定血管的可扩张性。
