The Application of Accurate Calculation of Magnetic Field Intensity in 1.5-T Superconducting MRI Magnet Design
Identifieur interne : 000900 ( Main/Exploration ); précédent : 000899; suivant : 000901The Application of Accurate Calculation of Magnetic Field Intensity in 1.5-T Superconducting MRI Magnet Design
Auteurs : ZHONGKUI FENG [République populaire de Chine] ; LANKAI LI [République populaire de Chine] ; CHUNJIE GAO [République populaire de Chine] ; GUANG ZHU [République populaire de Chine] ; YI LI [République populaire de Chine] ; XIAN LI [République populaire de Chine] ; YINMING DAI [République populaire de Chine] ; QIULIANG WANG [République populaire de Chine]Source :
- IEEE transactions on applied superconductivity [ 1051-8223 ] ; 2012.
Descripteurs français
- Pascal (Inist)
- Champ magnétique, Electroaimant supraconducteur, Imagerie RMN, Solénoïde, Fil supraconducteur, Densité courant, Distribution courant, Matière charge, Simulation mathématique, Aimant, Hétérogénéité, Harmonique, Homogénéité, Paramètre s, Optimisation, Algorithme, Logiciel MATLAB, Contrainte thermique, Instabilité thermique de la polarisation.
English descriptors
- KwdEn :
- Algorithm, Bias temperature instability, Current density, Current distribution, Filler, Harmonic, Heterogeneity, Homogeneity, MATLAB software, Magnet, Magnetic field, Mathematical simulation, Nuclear magnetic resonance imaging, Optimization, Solenoid, Superconducting magnet, Superconducting wires, Thermal stress, s parameter.
Abstract
Currently, when calculating the magnetic field generated by the solenoid coil of the superconducting wire wound, we assume that the coil cross section with a uniform current density, but actual current in superconducting wires (NbTi) in the form of a wire in channel is not evenly distributed, the current distribution only in the superconducting core, i.e., there is no current in copper, insulation, and filler, and this method of calculation will result in errors. In this paper, we model the superconducting cores of the 1.5-T superconducting magnetic resonance imaging (MRI) magnet to calculate accurate magnetic field intensity and inhomogeneity by helicoidal method in the diameter of spherical volume and find that inhomogeneity is eight times bigger than that calculated by spherical harmonic expansions, which cannot be accepted in design. Hence, in order to design a high-homogeneity MRI magnet, we amend the 1.5-T MRI magnet's original parameters by an optimization algorithm through an original interface between OPERA-3D and MATLAB according to the accurate results.
Affiliations:
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Li" last="Lankai Li">LANKAI LI</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute of Electrical Engineering, Chinese Academy of Sciences</s1><s2>Beijing 100190</s2><s3>CHN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>République populaire de Chine</country><placeName><settlement type="city">Pékin</settlement></placeName></affiliation></author><author><name sortKey="Chunjie Gao" sort="Chunjie Gao" uniqKey="Chunjie Gao" last="Chunjie Gao">CHUNJIE GAO</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute of Electrical Engineering, Chinese Academy of Sciences</s1><s2>Beijing 100190</s2><s3>CHN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>République populaire de Chine</country><placeName><settlement type="city">Pékin</settlement></placeName></affiliation></author><author><name sortKey="Guang Zhu" sort="Guang Zhu" uniqKey="Guang Zhu" last="Guang Zhu">GUANG ZHU</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute of Electrical Engineering, Chinese Academy of Sciences</s1><s2>Beijing 100190</s2><s3>CHN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>République populaire de Chine</country><placeName><settlement type="city">Pékin</settlement></placeName></affiliation></author><author><name sortKey="Yi Li" sort="Yi Li" uniqKey="Yi Li" last="Yi Li">YI LI</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute of Electrical Engineering, Chinese Academy of Sciences</s1><s2>Beijing 100190</s2><s3>CHN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>République populaire de Chine</country><placeName><settlement type="city">Pékin</settlement></placeName></affiliation></author><author><name sortKey="Xian Li" sort="Xian Li" uniqKey="Xian Li" last="Xian Li">XIAN LI</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute of Electrical Engineering, Chinese Academy of Sciences</s1><s2>Beijing 100190</s2><s3>CHN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>République populaire de Chine</country><placeName><settlement type="city">Pékin</settlement></placeName></affiliation></author><author><name sortKey="Yinming Dai" sort="Yinming Dai" uniqKey="Yinming Dai" last="Yinming Dai">YINMING DAI</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute of Electrical Engineering, Chinese Academy of Sciences</s1><s2>Beijing 100190</s2><s3>CHN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>République populaire de Chine</country><placeName><settlement type="city">Pékin</settlement></placeName></affiliation></author><author><name sortKey="Qiuliang Wang" sort="Qiuliang Wang" uniqKey="Qiuliang Wang" last="Qiuliang Wang">QIULIANG WANG</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute of Electrical Engineering, Chinese Academy of Sciences</s1><s2>Beijing 100190</s2><s3>CHN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>République populaire de Chine</country><placeName><settlement type="city">Pékin</settlement></placeName></affiliation></author></analytic><series><title level="j" type="main">IEEE transactions on applied superconductivity</title><title level="j" type="abbreviated">IEEE trans. appl. supercond.</title><idno type="ISSN">1051-8223</idno><imprint><date when="2012">2012</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">IEEE transactions on applied superconductivity</title><title level="j" type="abbreviated">IEEE trans. appl. supercond.</title><idno type="ISSN">1051-8223</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Algorithm</term><term>Bias temperature instability</term><term>Current density</term><term>Current distribution</term><term>Filler</term><term>Harmonic</term><term>Heterogeneity</term><term>Homogeneity</term><term>MATLAB software</term><term>Magnet</term><term>Magnetic field</term><term>Mathematical simulation</term><term>Nuclear magnetic resonance imaging</term><term>Optimization</term><term>Solenoid</term><term>Superconducting magnet</term><term>Superconducting wires</term><term>Thermal stress</term><term>s parameter</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Champ magnétique</term><term>Electroaimant supraconducteur</term><term>Imagerie RMN</term><term>Solénoïde</term><term>Fil supraconducteur</term><term>Densité courant</term><term>Distribution courant</term><term>Matière charge</term><term>Simulation mathématique</term><term>Aimant</term><term>Hétérogénéité</term><term>Harmonique</term><term>Homogénéité</term><term>Paramètre s</term><term>Optimisation</term><term>Algorithme</term><term>Logiciel MATLAB</term><term>Contrainte thermique</term><term>Instabilité thermique de la polarisation</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Currently, when calculating the magnetic field generated by the solenoid coil of the superconducting wire wound, we assume that the coil cross section with a uniform current density, but actual current in superconducting wires (NbTi) in the form of a wire in channel is not evenly distributed, the current distribution only in the superconducting core, i.e., there is no current in copper, insulation, and filler, and this method of calculation will result in errors. In this paper, we model the superconducting cores of the 1.5-T superconducting magnetic resonance imaging (MRI) magnet to calculate accurate magnetic field intensity and inhomogeneity by helicoidal method in the diameter of spherical volume and find that inhomogeneity is eight times bigger than that calculated by spherical harmonic expansions, which cannot be accepted in design. Hence, in order to design a high-homogeneity MRI magnet, we amend the 1.5-T MRI magnet's original parameters by an optimization algorithm through an original interface between OPERA-3D and MATLAB according to the accurate results.</div></front></TEI><affiliations><list><country><li>République populaire de Chine</li></country><settlement><li>Pékin</li></settlement></list><tree><country name="République populaire de Chine"><noRegion><name sortKey="Zhongkui Feng" sort="Zhongkui Feng" uniqKey="Zhongkui Feng" last="Zhongkui Feng">ZHONGKUI FENG</name></noRegion><name sortKey="Chunjie Gao" sort="Chunjie Gao" uniqKey="Chunjie Gao" last="Chunjie Gao">CHUNJIE GAO</name><name sortKey="Guang Zhu" sort="Guang Zhu" uniqKey="Guang Zhu" last="Guang Zhu">GUANG ZHU</name><name sortKey="Lankai Li" sort="Lankai Li" uniqKey="Lankai Li" last="Lankai Li">LANKAI LI</name><name sortKey="Qiuliang Wang" sort="Qiuliang Wang" uniqKey="Qiuliang Wang" last="Qiuliang Wang">QIULIANG WANG</name><name sortKey="Xian Li" sort="Xian Li" uniqKey="Xian Li" last="Xian Li">XIAN LI</name><name sortKey="Yi Li" sort="Yi Li" uniqKey="Yi Li" last="Yi Li">YI LI</name><name sortKey="Yinming Dai" sort="Yinming Dai" uniqKey="Yinming Dai" last="Yinming Dai">YINMING DAI</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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