# Fast Electromagnetic Analysis of MRI Transmit RF Coils Based on Accelerated Integral Equation Methods

@article{Villena2016FastEA, title={Fast Electromagnetic Analysis of MRI Transmit RF Coils Based on Accelerated Integral Equation Methods}, author={Jorge Fernandez Villena and Athanasios G. Polimeridis and Yigitcan Eryaman and Elfar Adalsteinsson and Lawrence L. Wald and Jacob K. White and Luca Daniel}, journal={IEEE Transactions on Biomedical Engineering}, year={2016}, volume={63}, pages={2250-2261} }

A fast frequency domain full-wave electromagnetic simulation method is introduced for the analysis of MRI coils loaded with the realistic human body models. The approach is based on integral equation methods decomposed into two domains: 1) the RF coil array and shield, and 2) the human body region where the load is placed. The analysis of multiple coil designs is accelerated by introducing the precomputed magnetic resonance Green functions (MRGFs), which describe how the particular body model… Expand

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#### References

SHOWING 1-10 OF 41 REFERENCES

Computation of electromagnetic fields for high-frequency magnetic resonance imaging applications.

- Mathematics, Medicine
- Physics in medicine and biology
- 1996

A numerical method using the biconjugate gradient algorithm in combination with the fast Fourier transform to solve a matrix equation resulting from the discretization of an integrodifferential equation representing the original physical problem for high-frequency magnetic resonance imaging (MRI) applications. Expand

Time-domain finite-difference/finite-element hybrid simulations of radio frequency coils in magnetic resonance imaging.

- Physics, Medicine
- Physics in medicine and biology
- 2008

In order to simplify the treatment of the highly irregular FDTD/FETD interface, composite elements are proposed to demonstrate the validity and effectiveness of the hybrid method in high-field receive-and-transmit coil design. Expand

Application of finite difference time domain method for the design of birdcage RF head coils using multi-port excitations.

- Physics, Medicine
- Magnetic resonance imaging
- 2000

A three-dimensional finite difference time domain model was developed where the high pass birdcage coil and the imaged object are analysed as a single unit, and driving the coil in four ports provides an SAR distribution with peak values that are significantly less than those with linear or quadrature excitations. Expand

Electromagnetic Analysis and Design in Magnetic Resonance Imaging

- Physics
- 1998

INTRODUCTION TO MAGNETIC RESONANCE IMAGING Introduction Physical Principles of Nuclear Magnetic resonance Hardware of Magnetic Resonance Imaging Basic Pulse Sequences and Imaging Methods BASIC… Expand

A numerical postprocessing procedure for analyzing radio frequency MRI coils

- Computer Science
- 2011

A general numerical procedure is outlined that enables the effective simulation and performance comparison of RF coils and relies on an integrated modeling approach, which combines full-wave electromagnetic simulations with a scattering parameter network representation of all relevant tuning, matching, and decoupling elements. Expand

Fast MRI coil analysis based on 3-D electromagnetic and RF circuit co-simulation.

- Materials Science, Medicine
- Journal of magnetic resonance
- 2009

To accelerate the analysis of a multi-element MRI coil, a two-way link is used between radiofrequency (RF) circuit and 3-D electromagnetic (EM) simulation tools, saving considerable computation time. Expand

Fast frequency-sweep analysis of RF coils for MRI

- IEEE Transactions on Biomedical Engineering
- 1999

A fast frequency-sweep technique is developed for the analysis of radio-frequency coils for magnetic resonance imaging. This technique applies the method of asymptotic waveform evaluation to the… Expand

Frequency-domain finite element methods for electromagnetic field simulation: fundamentals, state of the art, and applications to EMI/EMC analysis

- Engineering
- Proceedings of Symposium on Electromagnetic Compatibility
- 1996

This paper provides a critical review of frequency-domain finite element methods and their applications to the modeling of electromagnetic interactions in complex electronic components and systems.… Expand

A tetrahedral modeling method for electromagnetic scattering by arbitrarily shaped inhomogeneous dielectric bodies

- Physics
- 1984

A method for calculating the electromagnetic scattering from and internal field distribution of arbitrarily shaped, inhomogeneous, dielectric bodies is presented. A volume integral equation is… Expand

Parallel excitation with an array of transmit coils

- Medicine, Chemistry
- Magnetic resonance in medicine
- 2004

Theoretical and experimental results are presented that establish the value of parallel excitation with a transmit coil array in accelerating excitation and managing RF power deposition and suggest that by exploiting the localization characteristics of the coils, an orchestrated play of shorter RF pulses can achieve desired excitation profiles faster without adding strains to gradients. Expand