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Two-point dixon met...
Two-point dixon method with flexible echo times
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- Berglund, Johan (author)
- Uppsala universitet,Enheten för radiologi
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- Ahlström, Håkan (author)
- Uppsala universitet,Enheten för radiologi
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- Johansson, Lars (author)
- Uppsala universitet,Enheten för radiologi
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- Kullberg, Joel (author)
- Uppsala universitet,Enheten för radiologi
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(creator_code:org_t)
- 2010-11-16
- 2011
- English.
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In: Magnetic Resonance in Medicine. - : Wiley. - 0740-3194 .- 1522-2594. ; 65:4, s. 994-1004
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Abstract
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- 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.
Keyword
- chemical shift imaging
- fat suppression
- two-point Dixon
- water and fat separation
- MEDICINE
- MEDICIN
Publication and Content Type
- ref (subject category)
- art (subject category)
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