Suppression of effects of gradient imperfections on imaging with alternate ascending/descending directional navigation
Identifieur interne : 007958 ( Main/Exploration ); précédent : 007957; suivant : 007959Suppression of effects of gradient imperfections on imaging with alternate ascending/descending directional navigation
Auteurs : Sung-Hong Park [États-Unis] ; Tiejun Zhao [États-Unis] ; Jung-Hwan Kim [États-Unis] ; Fernando E. Boada [États-Unis] ; Kyongtae Ty Bae [États-Unis]Source :
- Magnetic Resonance in Medicine [ 0740-3194 ] ; 2012-11.
English descriptors
- KwdEn :
- Acquisition scheme, Agarose, Aladdin, Aladdin imaging, Aladdin signals, Artifact, Artifactual signals, Asymmetry, Bssfp, Center slice, Datasets, Eddy, Eddy currents, Frequency domain, Frequency shifts, Gradient, Gradient imperfections, Gradient polarities, Gradient polarity, Human brain, Imaging, Imperfection, Isocenter, Magn, Magn reson, Magnetization, Magnetization transfer, Negative portions, Potential explanation, Residual, Residual signals, Reson, Scan direction, Scan time, Signal change, Signal changes, Skeletal muscle, Slice thickness, Subtraction artifacts, Vivo brain.
- Teeft :
- Acquisition scheme, Agarose, Aladdin, Aladdin imaging, Aladdin signals, Artifact, Artifactual signals, Asymmetry, Bssfp, Center slice, Datasets, Eddy, Eddy currents, Frequency domain, Frequency shifts, Gradient, Gradient imperfections, Gradient polarities, Gradient polarity, Human brain, Imaging, Imperfection, Isocenter, Magn, Magn reson, Magnetization, Magnetization transfer, Negative portions, Potential explanation, Residual, Residual signals, Reson, Scan direction, Scan time, Signal change, Signal changes, Skeletal muscle, Slice thickness, Subtraction artifacts, Vivo brain.
Abstract
Alternate ascending/descending directional navigation (ALADDIN) is a new imaging technique that provides interslice perfusion‐weighted and magnetization transfer (MT) asymmetry images. In this article, we investigated the effects of gradient imperfections on ALADDIN MT asymmetry (MTA) signals. Subtraction artifacts increasing with readout offsets were detectable in ALADDIN MTA images from an agarose phantom but not from a water phantom. Slice‐select offsets had no significant effect on the artifacts in MTA. The artifacts were suppressed by averaging signals over the readout gradient polarities independent of scan parameters. All these results suggested that the subtraction artifacts were induced by readout eddy currents. With suppression of the artifacts, ALADDIN signals in human brain and skeletal muscle varied less with scan conditions. Percent signal changes of MTA in human skeletal muscle (0.51 ± 0.11%, N = 3) were about 30% of those in white matter. The new averaging scheme will allow for more accurate MTA imaging with ALADDIN, especially at off‐center positions. Magn Reson Med, 2012. © 2012 Wiley Periodicals, Inc.
Url:
DOI: 10.1002/mrm.24169
Affiliations:
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In this article, we investigated the effects of gradient imperfections on ALADDIN MT asymmetry (MTA) signals. Subtraction artifacts increasing with readout offsets were detectable in ALADDIN MTA images from an agarose phantom but not from a water phantom. Slice‐select offsets had no significant effect on the artifacts in MTA. The artifacts were suppressed by averaging signals over the readout gradient polarities independent of scan parameters. All these results suggested that the subtraction artifacts were induced by readout eddy currents. With suppression of the artifacts, ALADDIN signals in human brain and skeletal muscle varied less with scan conditions. Percent signal changes of MTA in human skeletal muscle (0.51 ± 0.11%, N = 3) were about 30% of those in white matter. The new averaging scheme will allow for more accurate MTA imaging with ALADDIN, especially at off‐center positions. Magn Reson Med, 2012. © 2012 Wiley Periodicals, Inc.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Pennsylvanie</li></region><settlement><li>Pittsburgh</li></settlement><orgName><li>Université de Pittsburgh</li></orgName></list><tree><country name="États-Unis"><region name="Pennsylvanie"><name sortKey="Park, Sung Ong" sort="Park, Sung Ong" uniqKey="Park S" first="Sung-Hong" last="Park">Sung-Hong Park</name></region><name sortKey="Bae, Kyongtae Ty" sort="Bae, Kyongtae Ty" uniqKey="Bae K" first="Kyongtae Ty" last="Bae">Kyongtae Ty Bae</name><name sortKey="Boada, Fernando E" sort="Boada, Fernando E" uniqKey="Boada F" first="Fernando E." last="Boada">Fernando E. Boada</name><name sortKey="Boada, Fernando E" sort="Boada, Fernando E" uniqKey="Boada F" first="Fernando E." last="Boada">Fernando E. Boada</name><name sortKey="Kim, Jung Wan" sort="Kim, Jung Wan" uniqKey="Kim J" first="Jung-Hwan" last="Kim">Jung-Hwan Kim</name><name sortKey="Park, Sung Ong" sort="Park, Sung Ong" uniqKey="Park S" first="Sung-Hong" last="Park">Sung-Hong Park</name><name sortKey="Park, Sung Ong" sort="Park, Sung Ong" uniqKey="Park S" first="Sung-Hong" last="Park">Sung-Hong Park</name><name sortKey="Zhao, Tiejun" sort="Zhao, Tiejun" uniqKey="Zhao T" first="Tiejun" last="Zhao">Tiejun Zhao</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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