Multicoil Dixon chemical species separation with an iterative least-squares estimation method

This work describes a new approach to multipoint Dixon fat–water separation that is amenable to pulse sequences that require short echo time (TE) increments, such as steady‐state free precession (SSFP) and fast spin‐echo (FSE) imaging. Using an iterative linear least‐squares method that decomposes w...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2004-01, Vol.51 (1), p.35-45
Main Authors: Reeder, Scott B., Wen, Zhifei, Yu, Huanzhou, Pineda, Angel R., Gold, Garry E., Markl, Michael, Pelc, Norbert J.
Format: Article
Language:English
Subjects:
Adipose Tissue
Algorithms
Ankle Joint - anatomy & histology
Body Water
cardiac imaging
fast spin echo
fat suppression
Heart - anatomy & histology
Humans
Image Enhancement
Image Processing, Computer-Assisted
Knee Joint - anatomy & histology
Least-Squares Analysis
magnetic resonance imaging
Magnetic Resonance Imaging - methods
musculoskeletal imaging
Pelvis - anatomy & histology
phased-array coils
silicone
steady-state free precession
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Summary:This work describes a new approach to multipoint Dixon fat–water separation that is amenable to pulse sequences that require short echo time (TE) increments, such as steady‐state free precession (SSFP) and fast spin‐echo (FSE) imaging. Using an iterative linear least‐squares method that decomposes water and fat images from source images acquired at short TE increments, images with a high signal‐to‐noise ratio (SNR) and uniform separation of water and fat are obtained. This algorithm extends to multicoil reconstruction with minimal additional complexity. Examples of single‐ and multicoil fat–water decompositions are shown from source images acquired at both 1.5T and 3.0T. Examples in the knee, ankle, pelvis, abdomen, and heart are shown, using FSE, SSFP, and spoiled gradient‐echo (SPGR) pulse sequences. The algorithm was applied to systems with multiple chemical species, and an example of water–fat–silicone separation is shown. An analysis of the noise performance of this method is described, and methods to improve noise performance through multicoil acquisition and field map smoothing are discussed. Magn Reson Med 51:35–45, 2004. © 2003 Wiley‐Liss, Inc.
ISSN:0740-3194
1522-2594
DOI:10.1002/mrm.10675