Fast 3D Design of High-Permittivity Pads for Dielectric Shimming using Model Order Reduction and Nonlinear Optimization

Abstract

High-permittivity pads can be used to improve B High-permittivity pads can be used to improve B homogeneity and intensity in homogeneity and intensity inneuroimaging and body applications. Normally, neuroimaging and body applications. Normally, fifinding the “optimal” pad for a nding the “optimal” pad for aspeci specifific region of interest involves evaluating many di c region of interest involves evaluating many difffferent pad designs using erent pad designs usingelectromagnetic simulations, which is a very time-consuming approach taking electromagnetic simulations, which is a very time-consuming approach takinghours to days of computation time. We propose a nonlinear optimization method hours to days of computation time. We propose a nonlinear optimization methodbased on model order reduction that allows us to design high-permittivity pads based on model order reduction that allows us to design high-permittivity padsin less than 30 seconds. in less than 30 seconds.