An Efficient 3D RF Simulation Tool for Dielectric Shimming Optimization

Abstract (2016)

Authors

J.H.F. van Gemert Microwave Sensing, Signals & Systems - EEMCS
W. Brink Leiden University Medical Center
A Webb Leiden University Medical Center
R.F. Remis Signal Processing Systems - EEMCS
Research Group
Microwave Sensing, Signals & Systems (EEMCS) (TU Delft)
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Published Date

2016

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Microwave Sensing, Signals & Systems

Abstract

High permittivity materials, in the form of “dielectric pads” are used in neuroimaging and body applications to improve B1+ homogeneity and intensity or to reduce corresponding SAR measures. In 3D, systematic pad design is computationally intensive with very long associated simulation times. We propose a hybrid solution to this problem by combining the flexibility of FDTD to model complex background configurations (coil/shield/subject) with an integral equation approach that takes the presence of a dielectric pad into account. This solution leads to speed up factors of 30 – 40 compared with conventional FDTD approaches and enables effective 3D dielectric pad design.