Peter T. While1, Jan G. Korvink1, 2
1Department of Microsystems Engineering (IMTEK), Laboratory for Simulation, University of Freiburg, Freiburg im Breisgau, Baden-Wrttemberg, Germany; 2Freiburg Institute for Advanced Studies (FRIAS), University of Freiburg, Freiburg im Breisgau, Baden-Wrttemberg, Germany
Conventional shim systems are comprised of a set of dedicated coils for inducing low-order spherical harmonic fields. In contrast, shim arrays consist of multiple simple coil structures, such as circular loops, arranged on a uniform grid. These elements generate an alternative set of non-orthogonal basis fields that offer the potential for high-order shimming. In this study, a design concept is presented for generating shim arrays with irregular element geometry that afford field accuracy and efficiency advantages over the use of regular circular loops for inducing low-order fields.