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Article: Stimulated echo induced misestimates on diffusion tensor indices and its remedy

TitleStimulated echo induced misestimates on diffusion tensor indices and its remedy
Authors
KeywordsApparent diffusion coefficient
Fractional anisotropy
Stimulated echo
Twice-refocused spin-echo
Eddy current
Diffusion-weighted imaging
Issue Date2010
Citation
Journal of Magnetic Resonance Imaging, 2010, v. 31, n. 6, p. 1522-1529 How to Cite?
AbstractPurpose: To report possible erroneous estimates of diffusion parameters in the twice-refocused spin-echo (TRSE) technique, proposed to eliminate eddy-current-induced geometric distortions in diffusion-weighted echo-planar imaging, when stimulated echo signals are inappropriately included. Materials and Methods: Eleven subjects were included for imaging experiments on two 1.5 Tesla systems using the TRSE sequence. Three versions, two with unbalanced crusher gradients inserted to dephase the stimulated echo from the b = 0 images and one with balanced crusher gradients, were implemented. The apparent diffusion coefficients (ADC) and fractional anisotropy (FA) were derived and compared. Results: The ADCs obtained with unbalanced crusher gradients were closer to values reported in the literature. Stimulated echo led to ADC over-estimations by 34.2%, 50.4%, 54.0%, 51.5%, 24.0%, and 41.9% in the genu of corpus callosum, splenium of corpus callosum, bilateral corona radiata, internal capsule, mediofrontal gyrus, and the cuneus, respectively (P < 0.01), with concomitant reduction in FA in highly anisotropic regions. Over-estimations of diffusion coefficients were found to be roughly equal along all directions. Conclusion: Formation of stimulated echo in the TRSE technique can lead to erroneous estimations of the diffusion parameters, even if no prominent morphological artifacts are seen. © 2010 Wiley-Liss, Inc.
Persistent Identifierhttp://hdl.handle.net/10722/210075
ISSN
2015 Impact Factor: 3.25
2015 SCImago Journal Rankings: 1.683

 

DC FieldValueLanguage
dc.contributor.authorChuang, Tzu Chao-
dc.contributor.authorWu, Ming Ting-
dc.contributor.authorHuang, Teng Yi-
dc.contributor.authorLin, Yi Ru-
dc.contributor.authorTsai, Shang Yueh-
dc.contributor.authorChang, Hing Chiu-
dc.contributor.authorChung, Hsiao Wen-
dc.date.accessioned2015-05-22T06:06:31Z-
dc.date.available2015-05-22T06:06:31Z-
dc.date.issued2010-
dc.identifier.citationJournal of Magnetic Resonance Imaging, 2010, v. 31, n. 6, p. 1522-1529-
dc.identifier.issn1053-1807-
dc.identifier.urihttp://hdl.handle.net/10722/210075-
dc.description.abstractPurpose: To report possible erroneous estimates of diffusion parameters in the twice-refocused spin-echo (TRSE) technique, proposed to eliminate eddy-current-induced geometric distortions in diffusion-weighted echo-planar imaging, when stimulated echo signals are inappropriately included. Materials and Methods: Eleven subjects were included for imaging experiments on two 1.5 Tesla systems using the TRSE sequence. Three versions, two with unbalanced crusher gradients inserted to dephase the stimulated echo from the b = 0 images and one with balanced crusher gradients, were implemented. The apparent diffusion coefficients (ADC) and fractional anisotropy (FA) were derived and compared. Results: The ADCs obtained with unbalanced crusher gradients were closer to values reported in the literature. Stimulated echo led to ADC over-estimations by 34.2%, 50.4%, 54.0%, 51.5%, 24.0%, and 41.9% in the genu of corpus callosum, splenium of corpus callosum, bilateral corona radiata, internal capsule, mediofrontal gyrus, and the cuneus, respectively (P < 0.01), with concomitant reduction in FA in highly anisotropic regions. Over-estimations of diffusion coefficients were found to be roughly equal along all directions. Conclusion: Formation of stimulated echo in the TRSE technique can lead to erroneous estimations of the diffusion parameters, even if no prominent morphological artifacts are seen. © 2010 Wiley-Liss, Inc.-
dc.languageeng-
dc.relation.ispartofJournal of Magnetic Resonance Imaging-
dc.subjectApparent diffusion coefficient-
dc.subjectFractional anisotropy-
dc.subjectStimulated echo-
dc.subjectTwice-refocused spin-echo-
dc.subjectEddy current-
dc.subjectDiffusion-weighted imaging-
dc.titleStimulated echo induced misestimates on diffusion tensor indices and its remedy-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1002/jmri.22182-
dc.identifier.pmid20512910-
dc.identifier.scopuseid_2-s2.0-77952834616-
dc.identifier.volume31-
dc.identifier.issue6-
dc.identifier.spage1522-
dc.identifier.epage1529-
dc.identifier.eissn1522-2586-

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