A simplified method for accuracy estimation of nuclear magnetic resonant imaging
A simplified method for accuracy estimation of nuclear magnetic resonant imaging
复制标题
核磁共振成像精度估计的简化方法
DOI：
10.1063/1.1149113
复制
发表时间：
1998
影响因子：
1.6
通讯作者：
M. McCarthy
中科院分区：
文献类型：
--
作者：
D. Arola;R. Powell;G. Barrall;M. McCarthy
目前正使用基于断层摄影的多维数据集来计算物理性质和传输系数。本文提出了一种基于不确定性传播的方法，用于确定计算的属性值的有效范围。用于演示该方法的例子是应用核磁共振成像（NMRI）来测量流体速度分布，以计算流体粘度。速度数据的分辨率被证明是最重要的因素，实施基于核磁共振的粘滞系数技术。通过剪切粘度计算传播速度测量中的不确定性，以估计剪切粘度的标准偏差。两个数据集，实验速度分辨率为0.6和1.5毫米/秒，表明当剪切粘度标准偏差超过30%的预测剪切粘度值，我们观察到的数据和粘度之间的差异，使用传统的…
Multi-dimensional tomographic-based data sets are now being used to calculate physical properties and transport coefficients. This article presents a method, based upon the propagation of uncertainties, for determining the valid range of values for the property calculated. The example used to demonstrate the method is the application of nuclear magnetic resonance imaging (NMRI) to measure fluid velocity profiles for the calculation of fluid viscosities. The resolution of the velocity data is shown to be the most important factor for implementation of the NMRI-based viscometry technique. Uncertainties in the velocity measurement are propagated through the shear viscosity calculation to estimate the standard deviation of the shear viscosities. Two data sets, experimental velocity resolutions of 0.6 and 1.5 mm/s, demonstrate that when the shear viscosity standard deviation exceeds 30% of the predicted shear viscosity value we observe a discrepancy between the data and viscosities obtained using conventional ...