22-27 September 2019
Hyatt Regency Hotel Vancouver
Canada/Pacific timezone

Tue-Mo-Po2.06-09 [40]: On the Accurate Calculating of Coil-tissue Interactions for Ultra-high Field MRI RF Coils Using a Hybrid MoM/FDTD Algorithm

24 Sep 2019, 08:45
2h
Level 2 Posters 1

Level 2 Posters 1

Poster Presentation Tue-Mo-Po2.06 - MRI Magnets II

Speaker

Qiuliang Wang (Institute of Electrical Engineering, Chinese Academy of Sciences)

Description

In ultra-high field magnetic resonance imaging (MRI) systems, the wavelength of the radiofrequency (RF) field is comparable to the size of imaging object, thus causing complicated coil-tissue interactions, which can lead to detrimental changes of the magnetic field (B1 field) and thermal intensity in human tissue. However, the homogeneity of B1 field and safety is critical for the RF coil, which generate the need of accurate calculating for B1 field as well as specific absorption rate (SAR). In this paper, a huygence equivalent surface based hybrid method of moments (MoM) and finite-difference time-domain (FDTD) algorithm is used to calculate the B1 field and SAR for high frequency RF coils loaded with the human tissue. The frequency of 298MHz (7T),400MHz (9.4T) and 500MHz (11.75T) are simulated individually. Different kinds of RF coils are also modeled to achieve the best performance in separate frequencies. In addition, a well established finite element method (FEM) is also used to calculate the same problem as the hybrid method, which demonstrate the feasibility and superiority of MoM/FDTD technique. The results shown in this article may contribute to the fabrication of better RF coils.

Primary authors

Mr Yang Liu (Institute of Electrical Engineering, Chinese Academy of Sciences) Qiuliang Wang (Institute of Electrical Engineering, Chinese Academy of Sciences) Mr Chaoqun Niu (Institute of Electrical Engineering, Chinese Academy of Sciences) Mr Hongyi Qu (Institute of Electrical Engineering, Chinese Academy of Sciences)

Presentation Materials

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