A Simulation Study on the Effect of the High Permittivity Materials Geometrical Structure on the Transmit Field $ {B}_{\text{1}}^{\text{+}} $ at 1.5 T

doi:10.11938/cjmr20212904

Abstract

Abstract:

Recent studies show that high permittivity materials (HPMs) have great application prospects in improving the performance of RF coils and enhancing magnetic resonance image signal to noise ratio (SNR) in high and ultra-high field magnetic resonance imaging (MRI). So far the research about HPMs mainly focuses on its benefit for MRI image SNR, while investigation on how its geometrical structure affects the homogeneity of transmit field ($ {B}_{\text{1}}^{\text{+}} $) is insufficient. In this study the effect of the geometrical structure of HPMs on the average transmit efficiency and $ {B}_{\text{1}}^{\text{+}} $ inhomogeneity at 1.5 T was quantitatively analyzed through electromagnetic simulation. The results indicated that for the four investigated geometrical structures of HPMs the quartered cylinder is the optimum solution, which would be valuable for the application of HPMs in MRI.

Key words: magnetic resonance imaging (MRI), transmit field $ {B}_{\text{1}}^{\text{+}} $, electromagnetic simulation, high permittivity materials (HPMs)

CLC Number:

O482.53

De-gang TANG,Hong-chuang LI,Xiao-ling LIU,Lei SHI,Hai-dong LI,Chao-hui YE,Xin ZHOU. A Simulation Study on the Effect of the High Permittivity Materials Geometrical Structure on the Transmit Field $ {B}_{\text{1}}^{\text{+}} $ at 1.5 T[J]. Chinese Journal of Magnetic Resonance, 2022, 39(2): 155-162.

Figures/Tables 6

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参数	无HPMs	四等分圆筒状	四方块环绕	同侧三方块	120°扇环柱
发射效率η均值/$ \frac{{{\rm{ \mathsf{ μ} }}{\text{T}}}}{{\sqrt {\text{W}} }} $	1.52	2.13	2.07	1.59	1.91
CV/%	0.30	1.37	1.23	2.23	9.28

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