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Abstract #1148

An Efficient 3D RF Simulation Tool for Dielectric Shimming Optimization

Jeroen van Gemert1, Wyger Brink2, Andrew Webb2, and Rob Remis1

1Circuits & Systems, University of Technology, Delft, Netherlands, 2Radiology, Leiden University Medical Center, Leiden, Netherlands

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.

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