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Parameter estimatio...
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Björk, MarcusUppsala universitet,Avdelningen för systemteknik,Reglerteknik,Biomedical systems
(författare)
Parameter estimation approach to banding artifact reduction in balanced steady-state free precession
- Artikel/kapitelEngelska2014
Förlag, utgivningsår, omfång ...
Nummerbeteckningar
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LIBRIS-ID:oai:lup.lub.lu.se:fd20df55-fdfc-456b-95af-f919530724bb
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https://lup.lub.lu.se/record/4194953URI
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https://doi.org/10.1002/mrm.24986DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-206701URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Ämneskategori:ref swepub-contenttype
Anmärkningar
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Purpose: The balanced steady-state free precession (bSSFP) pulse sequence has shown to be of great interest due to its high signal-to-noise ratio efficiency. However, bSSFP images often suffer from banding artifacts due to off-resonance effects, which we aim to minimize in this paper. Methods: We present a general and fast two-step algorithm for 1) estimating the unknowns in the bSSFP signal model from multiple phase-cycled acquisitions, and 2) reconstructing band-free images. The first step, Linearization for Off-Resonance Estimation (LORE), solves the nonlinear problem approximately by a robust linear approach. The second step applies a Gauss-Newton algorithm, initialized by LORE, to minimize the nonlinear least squares criterion. We name the full algorithm LORE-GN. Results: We derive the Cramér-Rao bound (CRB), a theoretical lower bound of the variance for any unbiased estimator, and show that LORE-GN is statistically efficient. Furthermore, we show that simultaneous estimation of T1 and T2 from phase-cycled bSSFP is difficult, since the CRB is high at common SNR. Using simulated, phantom, and in vivo data, we illustrate the band-reduction capabilities of LORE-GN compared to other techniques, such as sum-of-squares. Conclusion: Using LORE-GN we can successfully minimize banding artifacts in bSSFP.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Ingle, R. Reeve
(författare)
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Gudmundson, ErikLund University,Lunds universitet,Matematisk statistik,Matematikcentrum,Institutioner vid LTH,Lunds Tekniska Högskola,Mathematical Statistics,Centre for Mathematical Sciences,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)mats-egn
(författare)
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Stoica, PeterUppsala universitet,Avdelningen för systemteknik,Reglerteknik,Biomedical systems(Swepub:uu)pst23965
(författare)
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Nishimura, Dwight G.
(författare)
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Barral, Joelle K.
(författare)
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Uppsala universitetAvdelningen för systemteknik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Magnetic Resonance in Medicine: Wiley72:3, s. 880-8921522-25940740-3194
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