Fast full-wave calculation of electromagnetic fields based on weak-form volume integral equation for MRI applications
High-field magnetic resonance imaging (MRI) scans have safety problems because energy is not homogeneously distributed in the human body. A prescan where energy and temperature distributions are calculated for input energy budgeting can significantly lower the risk. Therefore, fast and accurate calc...
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| Published in | Journal of engineering (Stevenage, England) Vol. 2018; no. 9; pp. 762 - 767 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English Japanese |
| Published |
The Institution of Engineering and Technology
01.09.2018
Institution of Engineering and Technology (IET) |
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| Online Access | Get full text |
| ISSN | 2051-3305 2051-3305 |
| DOI | 10.1049/joe.2018.0122 |
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| Abstract | High-field magnetic resonance imaging (MRI) scans have safety problems because energy is not homogeneously distributed in the human body. A prescan where energy and temperature distributions are calculated for input energy budgeting can significantly lower the risk. Therefore, fast and accurate calculations of the electromagnetic (EM) fields of an MRI system with a subject under scan are needed. Here, the authors present a fast EM solver based on a weak-form volume integral equation (VIE) for solving this problem. The proposed approach calculates the EM field inside the human body at a high speed without sacrificing accuracy. In the proposed approach, the VIE formulation for an inhomogeneous dielectric object is employed for near-field calculations. The operation on a dense matrix resulted by the VIE is accelerated by fast Fourier transform (FFT) in conjunction with the latest efficient iterative method. Numerical experiments are presented to show the speed and accuracy of the proposed EM solver. |
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| AbstractList | High-field magnetic resonance imaging (MRI) scans have safety problems because energy is not homogeneously distributed in the human body. A prescan where energy and temperature distributions are calculated for input energy budgeting can significantly lower the risk. Therefore, fast and accurate calculations of the electromagnetic (EM) fields of an MRI system with a subject under scan are needed. Here, the authors present a fast EM solver based on a weak-form volume integral equation (VIE) for solving this problem. The proposed approach calculates the EM field inside the human body at a high speed without sacrificing accuracy. In the proposed approach, the VIE formulation for an inhomogeneous dielectric object is employed for near-field calculations. The operation on a dense matrix resulted by the VIE is accelerated by fast Fourier transform (FFT) in conjunction with the latest efficient iterative method. Numerical experiments are presented to show the speed and accuracy of the proposed EM solver. |
| Author | Ma, Zu-Hui Vaughan, J. Thomas Yu, Wenwei Huang, Shao Ying Wan, Luo |
| Author_xml | – sequence: 1 givenname: Shao Ying surname: Huang fullname: Huang, Shao Ying email: huangshaoying@sutd.edu.sg organization: 1Singapore University of Technology and Design, Singapore – sequence: 2 givenname: Zu-Hui surname: Ma fullname: Ma, Zu-Hui organization: 2Yunnan University, Kunming, People's Republic of China – sequence: 3 givenname: Luo surname: Wan fullname: Wan, Luo organization: 3University of Electronic Science and Technology of China, Chengdu, People's Republic of China – sequence: 4 givenname: Wenwei surname: Yu fullname: Yu, Wenwei organization: 4Chiba University, Japan – sequence: 5 givenname: J. Thomas surname: Vaughan fullname: Vaughan, J. Thomas organization: 5Columbia University, New York, USA |
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| CitedBy_id | crossref_primary_10_1109_TAP_2020_3044685 crossref_primary_10_1038_s41598_022_08004_7 |
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| Keywords | fast Fourier transforms iterative methods biomedical MRI high-field magnetic resonance imaging scans high speed fast full-wave calculation human body dielectric materials input energy budgeting electromagnetic wave scattering weak-form volume integral equation integral equations accurate calculations VIE electromagnetic fields temperature distributions fast Fourier safety problems MRI system EM field MRI applications near-field calculations |
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| Snippet | High-field magnetic resonance imaging (MRI) scans have safety problems because energy is not homogeneously distributed in the human body. A prescan where... High‐field magnetic resonance imaging (MRI) scans have safety problems because energy is not homogeneously distributed in the human body. A prescan where... |
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| SubjectTerms | accurate calculations biomedical MRI dielectric materials electromagnetic fields electromagnetic wave scattering EM field fast Fourier fast Fourier transforms fast full‐wave calculation high speed high‐field magnetic resonance imaging scans human body input energy budgeting integral equations iterative methods MRI applications MRI system near‐field calculations Research Article safety problems temperature distributions VIE weak‐form volume integral equation |
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| Title | Fast full-wave calculation of electromagnetic fields based on weak-form volume integral equation for MRI applications |
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