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Resolving phase ambiguity in dual‐echo dixon imaging using a projected power method
Author(s) -
Zhang Tao,
Chen Yuxin,
Bao Shanshan,
Alley Marcus T.,
Pauly John M.,
Hargreaves Brian A.,
Vasanawala Shreyas S.
Publication year - 2017
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.26287
Subject(s) - echo (communications protocol) , phase (matter) , ambiguity , nuclear magnetic resonance , dual (grammatical number) , computer science , physics , art , literature , computer network , quantum mechanics , programming language
Purpose To develop a fast and robust method to resolve phase ambiguity in dual‐echo Dixon imaging. Methods A major challenge in dual‐echo Dixon imaging is to estimate the phase error resulting from field inhomogeneity. In this work, a binary quadratic optimization program was formulated to resolve the phase ambiguity. A projected power method was developed to efficiently solve the optimization problem. Both the 1‐peak fat model and 6‐peak fat model were applied to three‐dimensional (3D) datasets. Additionally, the proposed method was extended to dynamic magnetic resonance imaging (MRI) applications using the 6‐peak fat model. With institutional review board (IRB) approval and patient consent/assent, the proposed method was evaluated and compared with region growing on 29 consecutive 3D high‐resolution patient datasets. Results Fast and robust water/fat separation was achieved by the proposed method in different representative 3D datasets and dynamic 3D datasets. Superior water/fat separation was achieved using the 6‐peak fat model compared with the 1‐peak fat model. Compared to region growing, the proposed method reduced water/fat swaps from 76 to 7% of the patient cohort. Conclusion The proposed method can achieve fast and robust phase error estimation in dual‐echo Dixon imaging. Magn Reson Med 77:2066–2076, 2017. © 2016 International Society for Magnetic Resonance in Medicine