Numerical simulation of SAR and Si-field inhomogeneity of shielded rf coils loaded with the human head

Ji Chen; Zhaomei Feng; Jian Ming Jin

doi:10.1109/10.668755

Numerical simulation of SAR and Si-field inhomogeneity of shielded rf coils loaded with the human head

Ji Chen, Zhaomei Feng, Jian Ming Jin

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

Abstract

The finite-difference time-domain (FDTD) method is combined with the method of moments (MoM) to compute the electromagnetic fields of shielded radio-frequency (RF) coils loaded with an anatomically accurate model of a human head for high-frequency magnetic resonance imaging (MRI) applications. The combined method can predict both the specific energy absorption rate (SAR) and the magnetic field (known as the B\ field) excited by any RF coils. Results for SAR and BI field distribution, excited by shielded and end-capped birdcage coils, are calculated at 64, 128, 171, and 256 MHz. The results show that the value of SAR increases when the frequency of the B\ field increases and the B\ field exhibits a strong inhomogeneity at high frequencies.

Original language	English (US)
Pages (from-to)	642-649
Number of pages	8
Journal	IEEE Transactions on Biomedical Engineering
Volume	45
Issue number	5
DOIs	https://doi.org/10.1109/10.668755
State	Published - 1998

Keywords

Magnetic resonance imaging
Numerical method
Radio-frequency coil
Radio-frequency field
Specific absorption rate

ASJC Scopus subject areas

Biomedical Engineering

Online availability

10.1109/10.668755

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abstract = "The finite-difference time-domain (FDTD) method is combined with the method of moments (MoM) to compute the electromagnetic fields of shielded radio-frequency (RF) coils loaded with an anatomically accurate model of a human head for high-frequency magnetic resonance imaging (MRI) applications. The combined method can predict both the specific energy absorption rate (SAR) and the magnetic field (known as the B\ field) excited by any RF coils. Results for SAR and BI field distribution, excited by shielded and end-capped birdcage coils, are calculated at 64, 128, 171, and 256 MHz. The results show that the value of SAR increases when the frequency of the B\ field increases and the B\ field exhibits a strong inhomogeneity at high frequencies.",

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AU - Feng, Zhaomei

AU - Jin, Jian Ming

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AB - The finite-difference time-domain (FDTD) method is combined with the method of moments (MoM) to compute the electromagnetic fields of shielded radio-frequency (RF) coils loaded with an anatomically accurate model of a human head for high-frequency magnetic resonance imaging (MRI) applications. The combined method can predict both the specific energy absorption rate (SAR) and the magnetic field (known as the B\ field) excited by any RF coils. Results for SAR and BI field distribution, excited by shielded and end-capped birdcage coils, are calculated at 64, 128, 171, and 256 MHz. The results show that the value of SAR increases when the frequency of the B\ field increases and the B\ field exhibits a strong inhomogeneity at high frequencies.

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Numerical simulation of SAR and Si-field inhomogeneity of shielded rf coils loaded with the human head

Abstract

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