Design of an insertable cone-shaped gradient coil matrix for head imaging with a volumetric finite-difference method

Abstract

Matrix gradient coils have received increasing interest in generating arbitrary-shaped magnetic fields for various magnetic resonance imaging applications. In this paper, a novel cone-shaped matrix gradient coil is proposed to design a multifunctional insertable system for head imaging. Using a volumetric finite-difference-based method, the matrix coil is designed to have comprised several coil elements that can implement localized imaging and control eddy current, dissipated power, and minimum wire gap. With the lowest total dissipated power, various current configurations are selected to generate multiple gradient fields within a large, spheroidal region of interest (ROI) and two small spherical sub-ROIs. The numerical computation results show that the designed matrix coil offers high flexibility in generating a local gradient field capable of improving the local resolution. In addition, with enhanced coil performance, the cone-shaped structure provides a patient-friendly solution for head imaging.

Multi-coil design for a coaxial double-cylinder head MRI scanner

“…The coil system with a fixed structure is easy to realize and can reduce the current demand by applying multi-turn coil structure. The MC system was further used in magnetic field shimming and RF function as well (Juchem et al, 2011a(Juchem et al, , 2011bHan et al, 2013;Littin et al, 2017;Winkler et al, 2018;Gao et al, 2020;Kang et al, 2021). Complex magnetic fields can be realized by adjusting structural parameters including shape, position and sizes of coils.…”