Effects of acceleration on the accuracy of MR phase velocity measurements
Effects of acceleration on the accuracy of MR phase velocity measurements
复制标题
加速度对 MR 相速度测量精度的影响
DOI：
10.1002/jmri.1880020610
复制
发表时间：
1992
影响因子：
4.4
通讯作者：
R. Pettigrew
中科院分区：
文献类型：
--
作者：
J. Oshinski;D. Ku;D. Bohning;R. Pettigrew
血流中的加速会影响相速度测量的准确性。对流加速是由流动几何形状的变化引起的，与流动脉动引起的时变加速度无关。为了分析对流加速对流速测量的影响，在雷诺数为1,500的90%沙漏状狭窄模体的收敛段，在定常层流中进行了相速度测量。狭窄处的测量表明，对流加速导致平均横截面速度的测量值与理论值的偏差高达37%。误差的大小可以通过在相移方程中包括对流加速项来解释。在通过狭窄的流速测量中，不应忽略对流加速效应，即使可以忽略由于流动脉动引起的随时间变化的加速度。
Acceleration in blood flow can affect the accuracy of phase velocity measurements. Convective acceleration is due to changes in flow geometry and is independent of the time‐varying acceleration caused by flow pulsatility. To analyze the effects of convective acceleration on flow velocity measurements, phase velocity measurements were obtained in steady laminar flow in the convergent segment of a 90%, hourglass‐shaped stenosis phantom at a Reynolds number of 1,500. Measurements at the stenosis indicated that convective acceleration caused the measured values of average cross‐sectional velocity to deviate as much as 37% from the theoretical values. The magnitude of the error could be accounted for by including the convective acceleration term in the phase shift equation. Convective acceleration effects should not be ignored in flow velocity measurements through stenoses, even when time‐dependent acceleration due to flow pulsatility can be neglected.
将离子和非离子造影剂注入急性肺动脉高压犬模型的肺动脉中的血流动力学效应。
影响因子：
6.7
作者：
Rees,CR;Palmaz,JC;Garcia,O;Alvarado,R;Siegle,RL
通讯作者：
Siegle,RL