使用磁共振成像测量动脉脉搏波速度的准确性。
Accuracy of arterial pulse-wave velocity measurement using MR.
作者信息
Bolster B D, Atalar E, Hardy C J, McVeigh E R
机构信息
Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
出版信息
J Magn Reson Imaging. 1998 Jul-Aug;8(4):878-88. doi: 10.1002/jmri.1880080418.
Abstract
The performance of a one-dimensional MR technique for the estimation of pulse-wave velocity in the aorta was evaluated. An expression for the error in this estimate was formulated and verified both by simulation and by experiment. On the basis of this formulation, guidelines for increasing the efficiency of the acquisition were established. The technique was further validated by comparison with pulse-wave velocity measurements made with a pressure catheter. All data were acquired from a latex tube driven by a pulsatile flow system. MR measurements of pulse-wave velocity in the tube were found to be very reproducible in the presence of white noise. Measurements by other techniques were in good agreement, falling within 2 SD of the mean. Because of its sensitivity and spatial resolution, this technique shows promise for making spatially resolved estimates of vessel distensibility. This would allow assessment of diseases, such as atherosclerosis, that cause local changes in the material properties of the vasculature.
摘要
评估了一种用于估计主动脉脉搏波速度的一维磁共振技术的性能。通过模拟和实验制定并验证了该估计误差的表达式。基于此公式，建立了提高采集效率的指导原则。通过与压力导管进行的脉搏波速度测量结果进行比较，进一步验证了该技术。所有数据均采集自由脉动流系统驱动的乳胶管。发现在存在白噪声的情况下，管内脉搏波速度的磁共振测量具有很高的可重复性。其他技术的测量结果吻合良好，均落在均值的2个标准差范围内。由于其灵敏度和空间分辨率，该技术在进行血管扩张性的空间分辨估计方面显示出前景。这将有助于评估诸如动脉粥样硬化等导致脉管系统材料特性局部变化的疾病。
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