Ultrafast magnetic-resonance-imaging velocimetry of liquid-liquid systems: overcoming chemical-shift artifacts using compressed sensing.
Ultrafast magnetic-resonance-imaging velocimetry of liquid-liquid systems: overcoming chemical-shift artifacts using compressed sensing.
复制标题
DOI：
10.1103/physreve.89.063009
复制
发表时间：
2014-06
期刊：
影响因子：
--
通讯作者：
A. Tayler;Martin Benning;A. Sederman;D. Holland;L. Gladden
中科院分区：
文献类型：
--
作者：
A. Tayler;Martin Benning;A. Sederman;D. Holland;L. Gladden
我们提出了使用超快磁共振成像获得的液-液系统的分散相和连续相流场的同时测量。化学位移伪影，这是否则高度成问题的这种类型的测量，克服了使用基于压缩感测的图像重建算法，占非谐振信号分量。该方案与高时间分辨率螺旋成像（每秒188帧）相结合，这是指出其鲁棒性流动。它表明，定量信号强度和相位预处理保留整个图像重建算法。测量获得不同粘度的油滴上升通过停滞的水。从这些数据中可以看出，内部液滴流场受到液滴形状振荡的严重影响，并且液滴形状的准确建模在液滴侧流体动力学建模中至关重要。该技术的应用，三组分系统也证明了，因为是一个相互可溶的物种（丙酮在聚二甲基硅氧烷-水）的局部浓度图的测量。
We present simultaneous measurement of dispersed and continuous phase flow fields for liquid-liquid systems obtained using ultrafast magnetic resonance imaging. Chemical-shift artifacts, which are otherwise highly problematic for this type of measurement, are overcome using a compressed sensing based image reconstruction algorithm that accounts for off-resonant signal components. This scheme is combined with high-temporal-resolution spiral imaging (188 frames per second), which is noted for its robustness to flow. It is demonstrated that both quantitative signal intensity and phase preconditioning are preserved throughout the image reconstruction algorithm. Measurements are acquired of oil droplets of varying viscosity rising through stagnant water. From these data it is apparent that the internal droplet flow fields are heavily influenced by the droplet shape oscillations, and that the accurate modeling of droplet shape is of critical importance in the modeling of droplet-side hydrodynamics. The application of the technique to three-component systems is also demonstrated, as is the measurement of local concentration maps of a mutually soluble species (acetone in polydimethylsiloxane-water).