Magnetic resonance imaging of acoustic streaming: absorption coefficient and acoustic field shape estimation.
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.
Madelin
Guillaume
G
Laboratoire de Résonance Magnétique des Systèmes Biologiques, UMR 5536 CNRS/Université Bordeaux 2, 146 rue Léo Saignat, case 93, 33076 Bordeaux Cedex, France.
Grucker
Daniel
D
Franconi
Jean-Michel
JM
Thiaudiere
Eric
E
D000042:Absorption; D000162:Acoustics; D005990:Glycerol; D008279:Magnetic Resonance Imaging; D014783:Viscosity; D014867:Water
D014867:Water; D005990:Glycerol