openEMS – a free and open source equivalent‐circuit (EC) FDTD simulation platform supporting cylindrical coordinates suitable for the analysis of traveling wave MRI applications

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  • Thorsten Liebig
    General and Theoretical Electrical Engineering (ATE), Faculty of Engineering University of Duisburg‐Essen, and CENIDE ‐ Center for Nanointegration Duisburg‐Essen D‐47057 Duisburg Germany
  • Andreas Rennings
    General and Theoretical Electrical Engineering (ATE), Faculty of Engineering University of Duisburg‐Essen, and CENIDE ‐ Center for Nanointegration Duisburg‐Essen D‐47057 Duisburg Germany
  • Sebastian Held
    General and Theoretical Electrical Engineering (ATE), Faculty of Engineering University of Duisburg‐Essen, and CENIDE ‐ Center for Nanointegration Duisburg‐Essen D‐47057 Duisburg Germany
  • Daniel Erni
    General and Theoretical Electrical Engineering (ATE), Faculty of Engineering University of Duisburg‐Essen, and CENIDE ‐ Center for Nanointegration Duisburg‐Essen D‐47057 Duisburg Germany

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<jats:title>SUMMARY</jats:title><jats:p>In this paper, we present a free and open source platform by using the equivalent‐circuit finite‐difference time‐domain (FDTD) method adapted to cylindrical coordinates to efficiently model cylindrically shaped objects. We will address the special characteristics of a cylindrical FDTD mesh such as the mesh singularity at <jats:italic>r</jats:italic> = 0 and discuss how cylindrical subgrids for small radii can reduce the simulation time considerably. Furthermore, we will demonstrate the applicability and advantages of this cylindrical equivalent‐circuit FDTD method to evaluate new types of conformal ring antennas used in the context of high‐field (7T) traveling wave magnetic resonance imaging (MRI). Copyright © 2012 John Wiley & Sons, Ltd.</jats:p>

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