Water-fat separation with IDEAL gradient-echo imaging.

Water-fat separation with IDEAL gradient-echo imaging. Research Abstract Details 

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Water-fat separation with IDEAL gradient-echo imaging. Abstract Text:

Scott B Reeder,Charles A McKenzie,Angel R Pineda,Huanzhou Yu,Ann Shimakawa,Anja C Brau,Brian A Hargreaves,Garry E Gold,Jean H Brittain,

PURPOSE: To combine gradient-echo (GRE) imaging with a multipoint water-fat separation method known as "iterative decomposition of water and fat with echo asymmetry and least squares estimation" (IDEAL) for uniform water-fat separation. Robust fat suppression is necessary for many GRE imaging applications; unfortunately, uniform fat suppression is challenging in the presence of B(0) inhomogeneities. These challenges are addressed with the IDEAL technique. MATERIALS AND METHODS: Echo shifts for three-point IDEAL were chosen to optimize noise performance of the water-fat estimation, which is dependent on the relative proportion of water and fat within a voxel. Phantom experiments were performed to validate theoretical SNR predictions. Theoretical echo combinations that maximize noise performance are discussed, and examples of clinical applications at 1.5T and 3.0T are shown. RESULTS: The measured SNR performance validated theoretical predictions and demonstrated improved image quality compared to unoptimized echo combinations. Clinical examples of the liver, breast, heart, knee, and ankle are shown, including the combination of IDEAL with parallel imaging. Excellent water-fat separation was achieved in all cases. The utility of recombining water and fat images into "in-phase," "out-of-phase," and "fat signal fraction" images is also discussed. CONCLUSION: IDEAL-SPGR provides robust water-fat separation with optimized SNR performance at both 1.5T and 3.0T with multicoil acquisitions and parallel imaging in multiple regions of the body.

Water-fat separation with IDEAL gradient-echo imaging. Publishing Authors By Initials

SB Reeder,CA McKenzie,AR Pineda,H Yu,A Shimakawa,AC Brau,BA Hargreaves,GE Gold,JH Brittain,

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Water-fat separation with IDEAL gradient-echo imaging. Journal Published:

PUBLICATION TYPE: Validation Studies

Journal: Journal of magnetic resonance imaging : JMRI

VOLUME: 25

Page Numbers: 644-52

Journal Abbreviation:

ISSN: 1053-1807

DAY: 3

MONTH: Mar

YEAR: 2007

Water-fat separation with IDEAL gradient-echo imaging. Information

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LANGUAGE: eng

NlmUniqueID: 9105850

Water-fat separation with IDEAL gradient-echo imaging. Keywords Mesh Terms:

KEYWORDS: Signal Processing, Computer-Assisted

MESH TERMS: pathology

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Grant and Affiliation Information for Water-fat separation with IDEAL gradient-echo imaging.

AFFILIATION: Department of Radiology, University of Wisconsin, Madison, Wisconsin 53792, USA. sreeder@wisc.edu

Country: United States

AGENCY: United States NIBIB

GRANT: R01-EB002524

ACRONYM: EB

MEDLINETA: J Magn Reson Imaging

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