Peter T. While1,
Michael S. Poole2, Jan G. Korvink1, 3
1Department
of Microsystems Engineering (IMTEK), Laboratory for Simulation, University of
Freiburg, Freiburg im Breisgau, Baden-Wrttemberg, Germany; 2Institute
of Neuroscience and Medicine - 4, Forschungszentrum Jlich GmbH, Jlich,
Nordrhein-Westfalen, Germany; 3Freiburg Institute for Advanced
Studies (FRIAS), University of Freiburg, Freiburg im Breisgau,
Baden-Wrttemberg, Germany
Gradient coils are often designed in terms of a continuous minimum power current density that is discretized to obtain the locations of coil tracks or wires. However, the existence of finite gaps between these conductors and a maximum conductor width leads to an underestimation of coil resistance. In this work, a current density mapping is proposed that accounts for these effects and is optimized to generate genuine minimum power coils post-discretization (i.e. accounting for build method). Many common coil types are surveyed and it is demonstrated that up to a 30% reduction in power dissipation is possible in certain cases.
Keywords