Spatially resolved NMR relaxation of gas in cavitating liquid

Authors

  • Igor Mastikhin MRI Centre, Dept. of Physics, University of New Brunswick, Fredericton, NB E3B 5A3, Canada
  • Benedict Newling MRI Centre, Dept. of Physics, University of New Brunswick, Fredericton, NB E3B 5A3, Canada

Keywords:

Cavitation, Magnetic resonance imaging, Parameter estimation, Relaxation processes, Gas bubbles, Saturation delay, Signal intensity

Abstract

The nuclear magnetic resonance (NMR) relaxation parameters of Freon-22 gas in cavitating liquid, was investigated using magnetic resonance imaging (MRI). The behavior of gas in multibubble cavitation was analyzed using 2.35 T MRI scanner with 20 kHz Langevin type transducer at standing wave conditions inside the water-filled cuvette. The NMR relaxation parameter T2 was measured using CPMG sequences to obtain information about the amount of Freon in dissolved and free states before, during, and after cavitation. The signal intensity of the dissolved Freon was saturated by a short recovery delay (1s) to attenuate signal to 32% of its initial intensity. The saturation delay was incremented from 10ms to 1s. It was observed that amount of observable gas inside the cuvette was slightly above the noise level before the cavitation, while the amount of free gas increased after initiation of cavitation. Result shows that signal intensity increase due to the presence of larger gas bubble.

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Published

2006-12-01

How to Cite

1.
Mastikhin I, Newling B. Spatially resolved NMR relaxation of gas in cavitating liquid. Canadian Acoustics [Internet]. 2006 Dec. 1 [cited 2021 Oct. 20];34(4):56-7. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1864

Issue

Section

Proceedings of the Acoustics Week in Canada

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