Sains Mark C, El-Bachir M Samir, Sederman Andrew J, Gladden Lynn F
Department of Chemical Engineering, University of Cambridge, Cambridge CB2 3RA, UK.
Magn Reson Imaging. 2005 Feb;23(2):391-3. doi: 10.1016/j.mri.2004.11.038.
A gradient echo rapid velocity and acceleration imaging sequence (GERVAIS) has been developed and implemented to image liquid flow within a narrow packed bed. Two-dimensional velocity images have been acquired with an in-plane pixel size of 781 microm x 781 microm, with a data acquisition time of 20 ms for a single velocity component. Images of the x, y and z velocity vectors are reported. Data are reported for Reynolds numbers (based on particle diameter) of 200 and 300. In each case, GERVAIS images are compared with the results of a standard spin-echo phase-encoding velocity measurement. At Re = 200, steady-state flow is expected and the velocity images acquired using both techniques are consistent. At Re = 300, the GERVAIS sequence is able to image the unsteady-state flow field within this system. In contrast, the standard phase-encoding velocity measurement contains significant artefacts.
一种梯度回波快速速度和加速度成像序列（GERVAIS）已被开发并应用于对狭窄填充床内的液体流动进行成像。已获取二维速度图像，其平面内像素大小为781微米×781微米，单个速度分量的数据采集时间为20毫秒。报告了x、y和z速度矢量的图像。给出了雷诺数（基于颗粒直径）为200和300时的数据。在每种情况下，将GERVAIS图像与标准自旋回波相位编码速度测量结果进行比较。在雷诺数为200时，预期为稳态流动，使用两种技术获取的速度图像是一致的。在雷诺数为300时，GERVAIS序列能够对该系统内的非稳态流场进行成像。相比之下，标准相位编码速度测量包含显著的伪影。
