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Coupled circuit numerical analysis of eddy currents in an open MRI system
http://hdl.handle.net/2241/00122256
http://hdl.handle.net/2241/00122256b1ad62e5-af26-4a23-a2ed-90f16eaf1785
名前 / ファイル | ライセンス | アクション |
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JMR_245 (1.4 MB)
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Item type | Journal Article(1) | |||||
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公開日 | 2014-10-21 | |||||
タイトル | ||||||
タイトル | Coupled circuit numerical analysis of eddy currents in an open MRI system | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
Akram, Md. Shahadat Hossain
× Akram, Md. Shahadat Hossain× Terada, Yasuhiko× Ishi, Keiichiro× Kose, Katsumi |
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著者別名 |
寺田, 康彦
× 寺田, 康彦× 巨瀬, 勝美 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We performed a new coupled circuit numerical simulation of eddy currents in an open compact magnetic resonance imaging (MRI) system. Following the coupled circuit approach, the conducting structures were divided into subdomains along the length (or width) and the thickness, and by implementing coupled circuit concepts we have simulated transient responses of eddy currents for subdomains in different locations. We implemented the Eigen matrix technique to solve the network of coupled differential equations to speed up our simulation program. On the other hand, to compute the coupling relations between the biplanar gradient coil and any other conducting structure, we implemented the solid angle form of Ampere’s law. We have also calculated the solid angle for three dimensions to compute inductive couplings in any subdomain of the conducting structures. Details of the temporal and spatial distribution of the eddy currents were then implemented in the secondary magnetic field calculation by the Biot–Savart law. In a desktop computer (Programming platform: Wolfram Mathematica 8.0®, Processor: Intel(R) Core(TM)2 Duo E7500 @ 2.93 GHz; OS: Windows 7 Professional; Memory (RAM): 4.00 GB), it took less than 3 min to simulate the entire calculation of eddy currents and fields, and approximately 6 min for X-gradient coil. The results are given in the time–space domain for both the direct and the cross-terms of the eddy current magnetic fields generated by the Z-gradient coil. We have also conducted free induction decay (FID) experiments of eddy fields using a nuclear magnetic resonance (NMR) probe to verify our simulation results. The simulation results were found to be in good agreement with the experimental results. In this study we have also conducted simulations for transient and spatial responses of secondary magnetic field induced by X-gradient coil. Our approach is fast and has much less computational complexity than the conventional electromagnetic numerical simulation methods. | |||||
書誌情報 |
Journal of magnetic resonance 巻 245, p. 1-11, 発行日 2014-08 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1090-7807 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11113784 | |||||
PubMed番号 | ||||||
識別子タイプ | PMID | |||||
関連識別子 | 24908640 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1016/j.jmr.2014.05.001 | |||||
権利 | ||||||
権利情報 | ©2014 Elsevier Inc. “NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Magnetic Resonance. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Magnetic Resonance,245,2014. DOI: 10.1016/j.jmr.2014.05.00 ” | |||||
著者版フラグ | ||||||
値 | author | |||||
出版者 | ||||||
出版者 | Elsevier Inc. |