✦ LIBER ✦

Flow velocity measurement with ac gradients

✍ Scribed by J. H. Walton; Mark S. Conradi

Publisher: John Wiley and Sons
Year: 1987
Tongue: English
Weight: 489 KB
Volume: 4
Category: Article
ISSN: 0740-3194
DOI: 10.1002/mrm.1910040308

No coin nor oath required. For personal study only.

✦ Synopsis

Two NMR experiments are described that use ac field gradients to measure flow velocities. Both experiments perform no spacial localization; instead, fluid velocity is converted to a resonance frequency shift. Thus, by Fourier transformation of a single FID or echo train the distribution of velocities is available. The first experiment uses only one rf pulse but requires a homogeneous static field. The second experiment uses the CPMG multiplepulse sequence to refocus the effects of field inhomogeneity and chemical shifts. Results are shown for both experiments using a simple flowing phantom. Applications of the techniques to time-resolved blood flow measurement are discussed.

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