title: Accelerated water-fat imaging using restricted subspace field map estimation and compressed sensing.
abstract: Water-fat separation techniques play an important role in a variety of clinical and research applications. In particular, multiecho separation methods remain a topic of great interest due to their ability to resolve water and fat images in the presence of B(0)-field inhomogeneity. However, these methods are inherently slow as they require multiple measurements. An accelerated technique with reduced k-space sampling is desirable to decrease the scan time. This work presents a new method for water-fat separation from accelerated multiecho acquisitions. The proposed approach does not require the region-growing or region-merging schemes that are typically used for field map estimation. Instead, the water, fat, and field map signals are estimated directly from the undersampled k-space measurements. In this work, up to 2.5×-acceleration is demonstrated in a water-fat phantom, ankle, knee, and liver.
authors.affiliation: Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA. sdsharma@usc.edu
authors.forename: Samir D
authors.initials: SD
authors.lastname: Sharma
authors.forename: Houchun H
authors.initials: HH
authors.lastname: Hu
authors.forename: Krishna S
authors.initials: KS
authors.lastname: Nayak
mesh_terms: D000273:Adipose Tissue; D000843:Ankle Joint / Q000033:anatomy & histology*; D001834:Body Water; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007719:Knee Joint / Q000033:anatomy & histology*; D008099:Liver / Q000033:anatomy & histology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008962:Models, Theoretical; D019047:Phantoms, Imaging; D012189:Retrospective Studies