Two-point dixon method with flexible echo times
2011 (English)In: Magnetic Resonance in Medicine, ISSN 0740-3194, E-ISSN 1522-2594, Vol. 65, no 4, 994-1004 p.Article in journal (Refereed) Published
The two-point Dixon method is a proton chemical shift imaging technique that produces separated water-only and fat-only images from a dual-echo acquisition. It is shown how this can be achieved without the usual constraints on the echo times. A signal model considering spectral broadening of the fat peak is proposed for improved water/fat separation. Phase errors, mostly due to static field inhomogeneity, must be removed prior to least-squares estimation of water and fat. To resolve ambiguity of the phase errors, a corresponding global optimization problem is formulated and solved using a message-passing algorithm. It is shown that the noise in the water and fat estimates matches the Cramér-Rao bounds, and feasibility is demonstrated for in vivo abdominal breath-hold imaging. The water-only images were found to offer superior fat suppression compared with conventional spectrally fat suppressed images.
Place, publisher, year, edition, pages
2011. Vol. 65, no 4, 994-1004 p.
chemical shift imaging, fat suppression, two-point Dixon, water and fat separation
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:uu:diva-150936DOI: 10.1002/mrm.22679ISI: 000288612000011PubMedID: 21413063OAI: oai:DiVA.org:uu-150936DiVA: diva2:409378