Peter T. While1, Larry K. Forbes1, Stuart Crozier2
1School of Maths and Physics, University of Tasmania, Hobart, TAS, Australia; 2School of Information Technology and Electrical Engineering, University of Queensland, Brisbane, QLD, Australia
An analytic method is described for the theoretical design of 3D gradient coils for open MRI systems. Rather than restricting coil windings to planar surfaces, the precise 3D geometry is obtained as part of the optimisation. The inverse problem is solved using regularisation with a minimum power constraint. A priority streamline seeding technique is used to position the windings. Results for an unshielded coil display concentrated current near the DSV with looped return path windings. However, for a shielded coil the windings are confined to biplanar surfaces, suggesting this is the optimum geometry for a shielded minimum power open coil.