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000138607 0247_ $$2doi$$a10.1007/s10334-015-0515-2
000138607 0247_ $$2pmid$$apmid:26861047
000138607 0247_ $$2pmc$$apmc:PMC4933014
000138607 0247_ $$2ISSN$$a0968-5243
000138607 0247_ $$2ISSN$$a1352-8661
000138607 037__ $$aDZNE-2020-04929
000138607 041__ $$aEnglish
000138607 082__ $$a530
000138607 1001_ $$0P:(DE-HGF)0$$aYarach, Uten$$b0$$eCorresponding author
000138607 245__ $$aCorrection of B 0-induced geometric distortion variations in prospective motion correction for 7T MRI.
000138607 260__ $$aHeidelberg$$bSpringer$$c2016
000138607 264_1 $$2Crossref$$3online$$bSpringer Science and Business Media LLC$$c2016-02-09
000138607 264_1 $$2Crossref$$3print$$bSpringer Science and Business Media LLC$$c2016-06-01
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000138607 520__ $$aProspective motion correction can effectively fix the imaging volume of interest. For large motion, this can lead to relative motion of coil sensitivities, distortions associated with imaging gradients and B 0 field variations. This work accounts for the B 0 field change due to subject movement, and proposes a method for correcting tissue magnetic susceptibility-related distortion in prospective motion correction.The B 0 field shifts at the different head orientations were characterized. A volunteer performed large motion with prospective motion correction enabled. The acquired data were divided into multiple groups according to the object positions. The correction of B 0-related distortion was applied to each group of data individually via augmented sensitivity encoding with additionally integrated gradient nonlinearity correction.The relative motion of the gradients, B 0 field and coil sensitivities in prospective motion correction results in residual spatial distortion, blurring, and coil artifacts. These errors can be mitigated by the proposed method. Moreover, iterative conjugate gradient optimization with regularization provided superior results with smaller RMSE in comparison to standard conjugate gradient.The combined correction of B 0-related distortion and gradient nonlinearity leads to a reduction of residual motion artifacts in prospective motion correction data.
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000138607 650_2 $$2MeSH$$aAlgorithms
000138607 650_2 $$2MeSH$$aArtifacts
000138607 650_2 $$2MeSH$$aBrain: diagnostic imaging
000138607 650_2 $$2MeSH$$aBrain: physiopathology
000138607 650_2 $$2MeSH$$aComputer Simulation
000138607 650_2 $$2MeSH$$aHumans
000138607 650_2 $$2MeSH$$aImage Processing, Computer-Assisted: methods
000138607 650_2 $$2MeSH$$aMagnetic Resonance Imaging
000138607 650_2 $$2MeSH$$aMale
000138607 650_2 $$2MeSH$$aModels, Theoretical
000138607 650_2 $$2MeSH$$aMotion
000138607 650_2 $$2MeSH$$aPhantoms, Imaging
000138607 7001_ $$aLuengviriya, Chaiya$$b1
000138607 7001_ $$aStucht, Daniel$$b2
000138607 7001_ $$aGodenschweger, Frank$$b3
000138607 7001_ $$0P:(DE-2719)2810420$$aSchulze, Peter$$b4$$udzne
000138607 7001_ $$0P:(DE-2719)2810706$$aSpeck, Oliver$$b5$$eLast author$$udzne
000138607 77318 $$2Crossref$$3journal-article$$a10.1007/s10334-015-0515-2$$b : Springer Science and Business Media LLC, 2016-02-09$$n3$$p319-332$$tMagnetic Resonance Materials in Physics, Biology and Medicine$$v29$$x0968-5243$$y2016
000138607 773__ $$0PERI:(DE-600)1502491-X$$a10.1007/s10334-015-0515-2$$gVol. 29, no. 3, p. 319 - 332$$n3$$p319-332$$q29:3<319 - 332$$tMagnetic resonance materials in physics, biology and medicine$$v29$$x0968-5243$$y2016
000138607 8567_ $$2Pubmed Central$$uhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC4933014
000138607 8564_ $$uhttps://pub.dzne.de/record/138607/files/DZNE-2020-04929_Restricted.pdf
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