Ultra-fast velocity imaging in stenotically produced turbulent jets using RUFIS
✍ Scribed by David P. Madio; H. Michael Gach; Prof. Irving J. Lowe
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 724 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
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.