Ultra‐fast velocity imaging in stenotically produced turbulent jets using RUFIS | Zendy

Madio David P. | Zendy; Gach H. Michael | Zendy; Lowe Irving J. | Zendy

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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.

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