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Ultra‐fast velocity imaging in stenotically produced turbulent jets using RUFIS
Author(s) -
Madio David P.,
Gach H. Michael,
Lowe Irving J.
Publication year - 1998
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.1910390410
Subject(s) - turbulence , spins , physics , reynolds number , pulse (music) , pulse sequence , jet (fluid) , optics , nuclear magnetic resonance , mechanics , detector , condensed matter physics
A method for rapidly producing velocity images is presented. This sequence combines a modified bipolar gradient pulse to magnitude encode the velocity with the rotating ultra‐fast imaging sequence (RUFIS) to image the encoded spins. Velocity encoding is done in 3 msec, and RUFIS acquires 32 projections in 8 msec. The method is applied to turbulent jets associated with a 75% stenosis in a 15‐mm inner diameter glass pipe. Data is acquired upstream and downstream from the stenosis for Reynolds numbers from 560 to 3750. In addition, a robust method of reconstructing the unobserved short time region of a free induction decay is presented and incorporated into the image processing.