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
Gradient coil hot spots can lead to image distortion and coil failure. An analytic method is presented for redesigning gradient coils with improved spatial temperature distributions and reduced hot spot temperatures. Maximum temperature is a non-linear constraint and a relaxed fixed point iteration scheme is introduced to alter the coil windings iteratively and lower the hot spot temperature. The new coil windings display a considerable improvement in hot spot temperature, at no cost to coil performance, when compared to equivalent minimum power x-gradient coils. The model can be adapted easily for other geometries, thermal properties, cooling mechanisms and non-linear constraints.