A hybrid FDTD/MoM algorithm with a conformal Huygens' equivalent surface for MRI RF coil design and analysis

Yang Liu; Qiuliang Wang; Feng Liu

doi:10.1016/j.mri.2023.03.013

A hybrid FDTD/MoM algorithm with a conformal Huygens' equivalent surface for MRI RF coil design and analysis

Yang Liu
, Qiuliang Wang
, Feng Liu

School of Electrical Engineering

CAS - Institute of Electrical Engineering
University of Chinese Academy of Sciences
University of Queensland

Research output: Contribution to journal › Article › peer-review

Abstract

Accurate design and analysis of radiofrequency (RF) coils are crucial for ultra-high field (UHF) magnetic resonance imaging (MRI) applications. To improve the numerical accuracy of electromagnetic (EM) simulations, we propose a hybrid finite difference time domain (FDTD)/method of moments (MoM) method. Unlike conventional cuboid-like Huygens' equivalent surfaces (HES), we proposed to use a conformal HES to interface the EM data of the FDTD and MoM zone. The shape and size of the conformal surface can be adjusted to fit different RF coil models, thus broadening the application range of the hybrid FDTD/MoM method. Two numerical models: an 8-channel ellipse array, and an 8-channel bent dipole array, are simulated and compared with the conventional HES counterpart. Numerical results demonstrate the capability of the conformal HES method in the analysis of RF coils.

Original language	English
Pages (from-to)	1-8
Number of pages	8
Journal	Magnetic Resonance Imaging
Volume	102
DOIs	https://doi.org/10.1016/j.mri.2023.03.013
State	Published - Oct 2023

Keywords

Conformal Huygens' equivalent surface
FDTD
Hybrid method
MoM
MRI RF coil

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10.1016/j.mri.2023.03.013

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title = "A hybrid FDTD/MoM algorithm with a conformal Huygens' equivalent surface for MRI RF coil design and analysis",

abstract = "Accurate design and analysis of radiofrequency (RF) coils are crucial for ultra-high field (UHF) magnetic resonance imaging (MRI) applications. To improve the numerical accuracy of electromagnetic (EM) simulations, we propose a hybrid finite difference time domain (FDTD)/method of moments (MoM) method. Unlike conventional cuboid-like Huygens' equivalent surfaces (HES), we proposed to use a conformal HES to interface the EM data of the FDTD and MoM zone. The shape and size of the conformal surface can be adjusted to fit different RF coil models, thus broadening the application range of the hybrid FDTD/MoM method. Two numerical models: an 8-channel ellipse array, and an 8-channel bent dipole array, are simulated and compared with the conventional HES counterpart. Numerical results demonstrate the capability of the conformal HES method in the analysis of RF coils.",

keywords = "Conformal Huygens' equivalent surface, FDTD, Hybrid method, MoM, MRI RF coil",

author = "Yang Liu and Qiuliang Wang and Feng Liu",

note = "Publisher Copyright: {\textcopyright} 2023",

year = "2023",

month = oct,

doi = "10.1016/j.mri.2023.03.013",

language = "英语",

volume = "102",

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T1 - A hybrid FDTD/MoM algorithm with a conformal Huygens' equivalent surface for MRI RF coil design and analysis

AU - Liu, Yang

AU - Wang, Qiuliang

AU - Liu, Feng

PY - 2023/10

Y1 - 2023/10

N2 - Accurate design and analysis of radiofrequency (RF) coils are crucial for ultra-high field (UHF) magnetic resonance imaging (MRI) applications. To improve the numerical accuracy of electromagnetic (EM) simulations, we propose a hybrid finite difference time domain (FDTD)/method of moments (MoM) method. Unlike conventional cuboid-like Huygens' equivalent surfaces (HES), we proposed to use a conformal HES to interface the EM data of the FDTD and MoM zone. The shape and size of the conformal surface can be adjusted to fit different RF coil models, thus broadening the application range of the hybrid FDTD/MoM method. Two numerical models: an 8-channel ellipse array, and an 8-channel bent dipole array, are simulated and compared with the conventional HES counterpart. Numerical results demonstrate the capability of the conformal HES method in the analysis of RF coils.

AB - Accurate design and analysis of radiofrequency (RF) coils are crucial for ultra-high field (UHF) magnetic resonance imaging (MRI) applications. To improve the numerical accuracy of electromagnetic (EM) simulations, we propose a hybrid finite difference time domain (FDTD)/method of moments (MoM) method. Unlike conventional cuboid-like Huygens' equivalent surfaces (HES), we proposed to use a conformal HES to interface the EM data of the FDTD and MoM zone. The shape and size of the conformal surface can be adjusted to fit different RF coil models, thus broadening the application range of the hybrid FDTD/MoM method. Two numerical models: an 8-channel ellipse array, and an 8-channel bent dipole array, are simulated and compared with the conventional HES counterpart. Numerical results demonstrate the capability of the conformal HES method in the analysis of RF coils.

KW - Conformal Huygens' equivalent surface

KW - FDTD

KW - Hybrid method

KW - MoM

KW - MRI RF coil

UR - https://www.scopus.com/pages/publications/85152664257

U2 - 10.1016/j.mri.2023.03.013

DO - 10.1016/j.mri.2023.03.013

M3 - 文章

C2 - 36963640

AN - SCOPUS:85152664257

SN - 0730-725X

VL - 102

SP - 1

EP - 8

JO - Magnetic Resonance Imaging

JF - Magnetic Resonance Imaging

ER -

A hybrid FDTD/MoM algorithm with a conformal Huygens' equivalent surface for MRI RF coil design and analysis

Abstract

Keywords

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