Madelin Guillaume, Grucker Daniel, Franconi Jean-Michel, Thiaudiere Eric
Laboratoire de Résonance Magnétique des Systèmes Biologiques, UMR 5536 CNRS/Université Bordeaux 2, 146 rue Léo Saignat, case 93, 33076 Bordeaux Cedex, France.
Ultrasonics. 2006 Jul;44(3):272-8. doi: 10.1016/j.ultras.2006.02.006. Epub 2006 Mar 15.
In this study, magnetic resonance imaging (MRI) is used to visualize acoustic streaming in liquids. A single-shot spin echo sequence (HASTE) with a saturation band perpendicular to the acoustic beam permits the acquisition of an instantaneous image of the flow due to the application of ultrasound. An average acoustic streaming velocity can be estimated from the MR images, from which the ultrasonic absorption coefficient and the bulk viscosity of different glycerol-water mixtures can be deduced. In the same way, this MRI method could be used to assess the acoustic field and time-average power of ultrasonic transducers in water (or other liquids with known physical properties), after calibration of a geometrical parameter that is dependent on the experimental setup.
在本研究中，磁共振成像（MRI）用于可视化液体中的声流。具有垂直于声束的饱和带的单次自旋回波序列（HASTE）允许在施加超声时获取流动的瞬时图像。可以从MR图像估计平均声流速度，由此可以推导出不同甘油 - 水混合物的超声吸收系数和体粘度。同样，在校准取决于实验装置的几何参数后，这种MRI方法可用于评估水中（或其他具有已知物理性质的液体）超声换能器的声场和时间平均功率。
