Galea Daniela, Lauzon M Louis, Drangova Maria
Robarts Research Institute, and Department of Medical Biophysics, University of Western Ontario, London, Canada.
Med Phys. 2002 Aug;29(8):1719-28. doi: 10.1118/1.1494829.
For quantitative peak velocity determination, a technique was developed that uses Fourier velocity encoding (FVE) for the fast acquisition of images of velocity with no spatial encoding other than slice selection. The technique produces images of velocity versus temporal frequency. In applications where the quantity of interest is the peak velocity and in-plane spatial localization is not required, high SNR images are produced with reduced sensitivity to errors due to slice thickness and motion. The technique was validated using steady and pulsatile flow in a straight tube, and compared to both phase contrast measurements and numerical models using steady flow in a 50% and a 75% cosinusoidal stenosis phantom. Results show that for slices as large as 2 cm and/or undergoing periodic motion, FVE can accurately measure the peak velocity in cases where a distribution of velocities exist.
为了进行定量峰值速度测定，开发了一种技术，该技术使用傅里叶速度编码（FVE）来快速获取速度图像，除切片选择外没有其他空间编码。该技术生成速度与时间频率的图像。在感兴趣的量是峰值速度且不需要平面内空间定位的应用中，可产生高信噪比图像，并且对由于切片厚度和运动引起的误差敏感性降低。该技术通过直管中的稳定和脉动流进行了验证，并与使用50%和75%余弦狭窄模型中的稳定流的相位对比测量和数值模型进行了比较。结果表明，对于高达2厘米的切片和/或经历周期性运动的切片，在存在速度分布的情况下，FVE可以准确测量峰值速度。
