Analysis of J coupling-induced fat suppression in DIET imaging.

Stables LA, Kennan RP, Anderson AW, Constable RT, Gore JC
J Magn Reson. 1999 136 (2): 143-51

PMID: 9986756 · DOI:10.1006/jmre.1998.1628

The DIET (or dual interval echo train) sequence, a modification of the fast spin echo (FSE) sequence that selectively reduces signal from fat in MR images, has been investigated. The DIET sequence uses an initial echo spacing longer than that of a conventional FSE sequence, thus allowing J coupling-induced dephasing to take effect. The sequence is evaluated theoretically, and its effectiveness on a hydrocarbon (1-pentene) is demonstrated numerically using density matrix calculations. The sequence is also evaluated experimentally using in vitro solutions and in vivo imaging. The efficacy of the sequence is compared for different lipid chemical structures, field strengths, and pulse sequence parameters.

Copyright 1999 Academic Press.

MeSH Terms (11)

Adipose Tissue Algorithms Echo-Planar Imaging Humans Hydrocarbons Lipids Magnetic Resonance Spectroscopy Mathematics Numerical Analysis, Computer-Assisted Phantoms, Imaging Signal Processing, Computer-Assisted

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