Hardy C J, Bolster B D, McVeigh E R, Iben I E, Zerhouni E A
GE Corporate Research and Development Center, Schenectady, New York 12301, USA.
Magn Reson Med. 1996 Jun;35(6):814-9. doi: 10.1002/mrm.1910350605.
A technique is presented for rapidly and noninvasively determining aortic distensibility, by NMR measurement of pulse-wave velocity in the aorta. A cylinder of magnetization is excited along the aorta, with Fourier-velocity encoding and readout gradients applied along the cylinder axis. Cardiac gating and data interleaving improve the effective time resolution to as high as 3 ms. Wave velocities are determined from the position of the foot of the flow wave in the velocity profiles. Evidence of helical flow distal to the aortic arch can be seen in normal subjects, while disturbed flow patterns are visible in patients with aneurysms and dissections.
本文介绍了一种通过核磁共振测量主动脉脉搏波速度来快速、无创地测定主动脉扩张性的技术。沿着主动脉激发一个磁化圆柱体，同时沿圆柱体轴施加傅里叶速度编码和读出梯度。心脏门控和数据交织将有效时间分辨率提高到高达3毫秒。根据速度剖面中血流波起始点的位置确定波速。在正常受试者中可以看到主动脉弓远端的螺旋血流迹象，而在患有动脉瘤和夹层的患者中则可见紊乱的血流模式。
