Dual Optimization Method of RF and Quasi-Static Field Simulations for Reduction of Eddy Currents Generated on 7T RF Coil Shielding
Identifieur interne : 003260 ( Main/Exploration ); précédent : 003259; suivant : 003261Dual Optimization Method of RF and Quasi-Static Field Simulations for Reduction of Eddy Currents Generated on 7T RF Coil Shielding
Auteurs : Yujuan Zhao [États-Unis] ; Tiejun Zhao [États-Unis] ; Shailesh B. Raval [États-Unis] ; Narayanan Krishnamurthy [États-Unis] ; Hai Zheng [États-Unis] ; Chad T. Harris [Canada] ; William B. Handler [Canada] ; Blaine A. Chronik [Canada] ; Tamer S. Ibrahim [États-Unis]Source :
- Magnetic resonance in medicine [ 0740-3194 ] ; 2014.
Descripteurs français
- KwdFr :
- MESH :
- anatomie et histologie : Encéphale.
- Champs électromagnétiques, Conception d'appareillage, Cuivre, Fantômes en imagerie, Humains, Imagerie par résonance magnétique, Ondes hertziennes, Simulation numérique.
English descriptors
- KwdEn :
- MESH :
- chemical : Copper.
- anatomy & histology : Brain.
- instrumentation : Magnetic Resonance Imaging.
- methods : Magnetic Resonance Imaging.
- Computer Simulation, Electromagnetic Fields, Equipment Design, Humans, Phantoms, Imaging, Radio Waves.
Abstract
To optimize the design of radiofrequency (RF) shielding of transmit coils at 7T and reduce eddy currents generated on the RF shielding when imaging with rapid gradient waveforms.
One set of a four-element, 2×2 Tic-Tac-Toe (TTT) head coil structure is selected and constructed to study eddy currents on the RF coil shielding. The generated eddy currents are quantitatively studied in the time and frequency domains. The RF characteristics are studied using the finite-difference time-domain (FDTD) method. Five different kinds of RF shielding were tested on a 7T MRI scanner with phantoms and in-vivo human subjects.
The eddy current simulation method is verified by the measurement results. Eddy currents induced by solid/intact and simple-structured slotted RF shielding can significantly distort the gradient fields. EPI images, B1+ maps and S matrix measurements verified that the proposed slot pattern can suppress the eddy currents while maintaining the RF characteristics of the transmit coil.
The presented dual-optimization method could be used to design the RF shielding and reduce the gradient field-induced eddy currents while maintaining the RF characteristics of the transmit coil.
Url:
DOI: 10.1002/mrm.25424
PubMed: 25367703
PubMed Central: 4515214
Affiliations:
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Raval</name><affiliation wicri:level="4"><nlm:aff id="A1">Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA</nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA</wicri:regionArea><placeName><region type="state">Pennsylvanie</region><settlement type="city">Pittsburgh</settlement></placeName><orgName type="university">Université de Pittsburgh</orgName></affiliation></author><author><name sortKey="Krishnamurthy, Narayanan" sort="Krishnamurthy, Narayanan" uniqKey="Krishnamurthy N" first="Narayanan" last="Krishnamurthy">Narayanan Krishnamurthy</name><affiliation wicri:level="4"><nlm:aff id="A1">Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA</nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA</wicri:regionArea><placeName><region type="state">Pennsylvanie</region><settlement type="city">Pittsburgh</settlement></placeName><orgName type="university">Université de Pittsburgh</orgName></affiliation></author><author><name sortKey="Zheng, Hai" sort="Zheng, Hai" uniqKey="Zheng H" first="Hai" last="Zheng">Hai Zheng</name><affiliation wicri:level="4"><nlm:aff id="A1">Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA</nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA</wicri:regionArea><placeName><region type="state">Pennsylvanie</region><settlement type="city">Pittsburgh</settlement></placeName><orgName type="university">Université de Pittsburgh</orgName></affiliation></author><author><name sortKey="Harris, Chad T" sort="Harris, Chad T" uniqKey="Harris C" first="Chad T." last="Harris">Chad T. Harris</name><affiliation wicri:level="1"><nlm:aff id="A3">Department of Physics and Astronomy, University of Western Ontario, London, Ontario, Canada</nlm:aff><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Physics and Astronomy, University of Western Ontario, London, Ontario</wicri:regionArea><wicri:noRegion>Ontario</wicri:noRegion></affiliation></author><author><name sortKey="Handler, William B" sort="Handler, William B" uniqKey="Handler W" first="William B." last="Handler">William B. Handler</name><affiliation wicri:level="1"><nlm:aff id="A3">Department of Physics and Astronomy, University of Western Ontario, London, Ontario, Canada</nlm:aff><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Physics and Astronomy, University of Western Ontario, London, Ontario</wicri:regionArea><wicri:noRegion>Ontario</wicri:noRegion></affiliation></author><author><name sortKey="Chronik, Blaine A" sort="Chronik, Blaine A" uniqKey="Chronik B" first="Blaine A." last="Chronik">Blaine A. Chronik</name><affiliation wicri:level="1"><nlm:aff id="A3">Department of Physics and Astronomy, University of Western Ontario, London, Ontario, Canada</nlm:aff><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Physics and Astronomy, University of Western Ontario, London, Ontario</wicri:regionArea><wicri:noRegion>Ontario</wicri:noRegion></affiliation></author><author><name sortKey="Ibrahim, Tamer S" sort="Ibrahim, Tamer S" uniqKey="Ibrahim T" first="Tamer S." last="Ibrahim">Tamer S. Ibrahim</name><affiliation wicri:level="4"><nlm:aff id="A1">Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA</nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA</wicri:regionArea><placeName><region type="state">Pennsylvanie</region><settlement type="city">Pittsburgh</settlement></placeName><orgName type="university">Université de Pittsburgh</orgName></affiliation><affiliation wicri:level="4"><nlm:aff id="A4">Department of Radiology, University of Pittsburgh, Pittsburgh, PA, USA</nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Radiology, University of Pittsburgh, Pittsburgh, PA</wicri:regionArea><placeName><region type="state">Pennsylvanie</region><settlement type="city">Pittsburgh</settlement></placeName><orgName type="university">Université de Pittsburgh</orgName></affiliation></author></analytic><series><title level="j">Magnetic resonance in medicine</title><idno type="ISSN">0740-3194</idno><idno type="eISSN">1522-2594</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Brain (anatomy & histology)</term><term>Computer Simulation</term><term>Copper</term><term>Electromagnetic Fields</term><term>Equipment Design</term><term>Humans</term><term>Magnetic Resonance Imaging (instrumentation)</term><term>Magnetic Resonance Imaging (methods)</term><term>Phantoms, Imaging</term><term>Radio Waves</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Champs électromagnétiques</term><term>Conception d'appareillage</term><term>Cuivre</term><term>Encéphale (anatomie et histologie)</term><term>Fantômes en imagerie</term><term>Humains</term><term>Imagerie par résonance magnétique ()</term><term>Imagerie par résonance magnétique (instrumentation)</term><term>Ondes hertziennes</term><term>Simulation numérique</term></keywords><keywords scheme="MESH" type="chemical" xml:lang="en"><term>Copper</term></keywords><keywords scheme="MESH" qualifier="anatomie et histologie" xml:lang="fr"><term>Encéphale</term></keywords><keywords scheme="MESH" qualifier="anatomy & histology" xml:lang="en"><term>Brain</term></keywords><keywords scheme="MESH" qualifier="instrumentation" xml:lang="en"><term>Magnetic Resonance Imaging</term></keywords><keywords scheme="MESH" qualifier="methods" xml:lang="en"><term>Magnetic Resonance Imaging</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Computer Simulation</term><term>Electromagnetic Fields</term><term>Equipment Design</term><term>Humans</term><term>Phantoms, Imaging</term><term>Radio Waves</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Champs électromagnétiques</term><term>Conception d'appareillage</term><term>Cuivre</term><term>Fantômes en imagerie</term><term>Humains</term><term>Imagerie par résonance magnétique</term><term>Ondes hertziennes</term><term>Simulation numérique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec id="S1"><title>Purpose</title><p id="P1">To optimize the design of radiofrequency (RF) shielding of transmit coils at 7T and reduce eddy currents generated on the RF shielding when imaging with rapid gradient waveforms.</p></sec><sec id="S2"><title>Methods</title><p id="P2">One set of a four-element, 2×2 Tic-Tac-Toe (TTT) head coil structure is selected and constructed to study eddy currents on the RF coil shielding. The generated eddy currents are quantitatively studied in the time and frequency domains. The RF characteristics are studied using the finite-difference time-domain (FDTD) method. Five different kinds of RF shielding were tested on a 7T MRI scanner with phantoms and in-vivo human subjects.</p></sec><sec id="S3"><title>Results</title><p id="P3">The eddy current simulation method is verified by the measurement results. Eddy currents induced by solid/intact and simple-structured slotted RF shielding can significantly distort the gradient fields. EPI images, B<sub>1</sub><sup>+</sup> maps and S matrix measurements verified that the proposed slot pattern can suppress the eddy currents while maintaining the RF characteristics of the transmit coil.</p></sec><sec id="S4"><title>Conclusion</title><p id="P4">The presented dual-optimization method could be used to design the RF shielding and reduce the gradient field-induced eddy currents while maintaining the RF characteristics of the transmit coil.</p></sec></div></front></TEI><affiliations><list><country><li>Canada</li><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="Zhao, Yujuan" sort="Zhao, Yujuan" uniqKey="Zhao Y" first="Yujuan" last="Zhao">Yujuan Zhao</name></region><name sortKey="Ibrahim, Tamer S" sort="Ibrahim, Tamer S" uniqKey="Ibrahim T" first="Tamer S." last="Ibrahim">Tamer S. Ibrahim</name><name sortKey="Ibrahim, Tamer S" sort="Ibrahim, Tamer S" uniqKey="Ibrahim T" first="Tamer S." last="Ibrahim">Tamer S. Ibrahim</name><name sortKey="Krishnamurthy, Narayanan" sort="Krishnamurthy, Narayanan" uniqKey="Krishnamurthy N" first="Narayanan" last="Krishnamurthy">Narayanan Krishnamurthy</name><name sortKey="Raval, Shailesh B" sort="Raval, Shailesh B" uniqKey="Raval S" first="Shailesh B." last="Raval">Shailesh B. Raval</name><name sortKey="Zhao, Tiejun" sort="Zhao, Tiejun" uniqKey="Zhao T" first="Tiejun" last="Zhao">Tiejun Zhao</name><name sortKey="Zheng, Hai" sort="Zheng, Hai" uniqKey="Zheng H" first="Hai" last="Zheng">Hai Zheng</name></country><country name="Canada"><noRegion><name sortKey="Harris, Chad T" sort="Harris, Chad T" uniqKey="Harris C" first="Chad T." last="Harris">Chad T. Harris</name></noRegion><name sortKey="Chronik, Blaine A" sort="Chronik, Blaine A" uniqKey="Chronik B" first="Blaine A." last="Chronik">Blaine A. Chronik</name><name sortKey="Handler, William B" sort="Handler, William B" uniqKey="Handler W" first="William B." last="Handler">William B. Handler</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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