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A Hybrid Volume-Surface Integral Equation Method for Rapid Electromagnetic Simulations in MRI | IEEE Journals & Magazine | IEEE Xplore

A Hybrid Volume-Surface Integral Equation Method for Rapid Electromagnetic Simulations in MRI


Abstract:

Objective: We developed a hybrid volume surface integral equation (VSIE) method based on domain decomposition to perform fast and accurate magnetic resonance imaging (MRI...Show More

Abstract:

Objective: We developed a hybrid volume surface integral equation (VSIE) method based on domain decomposition to perform fast and accurate magnetic resonance imaging (MRI) simulations that include both remote and local conductive elements. Methods: We separated the conductive surfaces present in MRI setups into two domains and optimized electromagnetic (EM) modeling for each case. Specifically, interactions between the body and EM waves originating from local radiofrequency (RF) coils were modeled with the precorrected fast Fourier transform, whereas the interactions with remote conductive surfaces (RF shield, scanner bore) were modeled with a novel cross tensor train-based algorithm. We compared the hybrid-VSIE with other VSIE methods for realistic MRI simulation setups. Results: The hybrid-VSIE was the only practical method for simulation using 1 mm voxel isotropic resolution (VIR). For 2 mm VIR, our method could be solved at least 23 times faster and required 760 times lower memory than traditional VSIE methods. Conclusion: The hybrid-VSIE demonstrated a marked improvement in terms of convergence times of the numerical EM simulation compared to traditional approaches in multiple realistic MRI scenarios. Significance: The efficiency of the novel hybrid-VSIE method could enable rapid simulations of complex and comprehensive MRI setups.
Published in: IEEE Transactions on Biomedical Engineering ( Volume: 70, Issue: 1, January 2023)
Page(s): 105 - 114
Date of Publication: 27 June 2022

ISSN Information:

PubMed ID: 35759593

Funding Agency:


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References

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