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- Publisher Website: 10.1002/jmri.22182
- Scopus: eid_2-s2.0-77952834616
- PMID: 20512910
- WOS: WOS:000278174300031
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Article: Stimulated echo induced misestimates on diffusion tensor indices and its remedy
Title | Stimulated echo induced misestimates on diffusion tensor indices and its remedy |
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Authors | |
Keywords | Apparent diffusion coefficient Fractional anisotropy Stimulated echo Twice-refocused spin-echo Eddy current Diffusion-weighted imaging |
Issue Date | 2010 |
Citation | Journal of Magnetic Resonance Imaging, 2010, v. 31, n. 6, p. 1522-1529 How to Cite? |
Abstract | Purpose: 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 Identifier | http://hdl.handle.net/10722/210075 |
ISSN | 2023 Impact Factor: 3.3 2023 SCImago Journal Rankings: 1.339 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Chuang, Tzu Chao | - |
dc.contributor.author | Wu, Ming Ting | - |
dc.contributor.author | Huang, Teng Yi | - |
dc.contributor.author | Lin, Yi Ru | - |
dc.contributor.author | Tsai, Shang Yueh | - |
dc.contributor.author | Chang, Hing Chiu | - |
dc.contributor.author | Chung, Hsiao Wen | - |
dc.date.accessioned | 2015-05-22T06:06:31Z | - |
dc.date.available | 2015-05-22T06:06:31Z | - |
dc.date.issued | 2010 | - |
dc.identifier.citation | Journal of Magnetic Resonance Imaging, 2010, v. 31, n. 6, p. 1522-1529 | - |
dc.identifier.issn | 1053-1807 | - |
dc.identifier.uri | http://hdl.handle.net/10722/210075 | - |
dc.description.abstract | Purpose: 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.language | eng | - |
dc.relation.ispartof | Journal of Magnetic Resonance Imaging | - |
dc.subject | Apparent diffusion coefficient | - |
dc.subject | Fractional anisotropy | - |
dc.subject | Stimulated echo | - |
dc.subject | Twice-refocused spin-echo | - |
dc.subject | Eddy current | - |
dc.subject | Diffusion-weighted imaging | - |
dc.title | Stimulated echo induced misestimates on diffusion tensor indices and its remedy | - |
dc.type | Article | - |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1002/jmri.22182 | - |
dc.identifier.pmid | 20512910 | - |
dc.identifier.scopus | eid_2-s2.0-77952834616 | - |
dc.identifier.volume | 31 | - |
dc.identifier.issue | 6 | - |
dc.identifier.spage | 1522 | - |
dc.identifier.epage | 1529 | - |
dc.identifier.eissn | 1522-2586 | - |
dc.identifier.isi | WOS:000278174300031 | - |
dc.identifier.issnl | 1053-1807 | - |