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    11-interval PFG pulse sequence for improved measurement of fast velocities of fluids with high diffusivity in systems with short T2* (2016)

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    Type of Content
    Journal Article
    UC Permalink
    http://hdl.handle.net/10092/13035
    
    Publisher
    University of Canterbury. Chemical and Process Engineering
    Collections
    • Engineering: Journal Articles [1526]
    Authors
    Boyce, C.M.
    Rice, N.P.
    Sederman, A.J.
    Dennis, J.S.
    Holland, D.J.
    show all
    Abstract

    Magnetic resonance (MR) was used to measure SF6 gas velocities in beds filled with particles of 1.1 mm and 0.5 mm in diameter. Four pulse sequences were tested: a traditional spin echo pulse sequence, the 9-interval and 13-interval pulse sequence of Cotts et al. (1989) and a newly developed 11-interval pulse sequence. All pulse sequences measured gas velocity accurately in the region above the particles at the highest velocities that could be achieved (up to 0.1 m s-1). The spin echo pulse sequence was unable to measure gas velocity accurately in the bed of particles, due to effects of background gradients, diffusivity and acceleration in flow around particles. The 9- and 13-interval pulse sequence measured gas velocity accurately at low flow rates through the particles (expected velocity < 0.06 m s-1), but could not measure velocity accurately at higher flow rates. The newly developed 11-interval pulse sequence was more accurate than the 9- and 13-interval pulse sequences at higher flow rates, but for velocities in excess of 0.1 m s-1 the measured velocity was lower than the expected velocity. The increased accuracy arose from the smaller echo time that the new pulse sequence enabled, reducing selective attenuation of signal from faster moving nuclei.

    Citation
    Boyce, C.M., Rice, N.P., Sederman, A.J., Dennis, J.S., Holland, D.J. (2016) 11-interval PFG pulse sequence for improved measurement of fast velocities of fluids with high diffusivity in systems with short T2*. Journal of Magnetic Resonance.
    This citation is automatically generated and may be unreliable. Use as a guide only.
    Keywords
    Flow NMR; pulsed field gradients; granular materials; pulse sequences
    ANZSRC Fields of Research
    11 - Medical and Health Sciences::1103 - Clinical Sciences::110320 - Radiology and Organ Imaging
    51 - Physical sciences::5105 - Medical and biological physics::510502 - Medical physics
    Rights
    https://hdl.handle.net/10092/17651

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