Magnetic resonance imaging of acoustic streaming in gases
Keywords:Acoustic streaming, Data reduction, Magnetic fields, Phase diagrams, Propane, Image contrasts, Pulse sequence timing diagrams, Pulse-field-gradient (PFG) method
AbstractA study was conducted to demonstrate the utility of magnetic resonance imaging (MRI) method for acoustic streaming (AS) in gases. The method used diverse array of possible image contrasts, which were manipulated through careful control of the spin physics during image acquisition to study the phenomenon of AS in gases. The position and velocity sensitization were performed through the use of magnetic field gradients and the pulse sequence timing diagram schematized the sequence of sample manipulation during the measurement. The imaging sequence was applied at 2.4 T to a 2m-long and 20-cm-diameter cylindrical tube filled with propane gas. The first data set showed 15 profiles, each acquired with a different amplitude of motion-sensitizing pulse-field-gradient (PFG) method. These measurements were repeated five times at 15-minutes intervals before, during, and after the establishment of an acoustic standing wave at 835 Hz in the tube.
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