Triple-ring permanent magnet design for ultra-low-field MRI System

Abstract

MRI has impacted modern healthcare tremendously. However, MRI accessibility is low and extremely inhomogeneous globally. The recent shift in prioritizing MRI’s value has seen the emergence in developing point-of-care systems at ultra-low-field (<0.1T), particularly the use of permanent magnets for its light-weight, low power and low cost benefits. However, fundamentally, a relatively strong and uniform magnetic field is still desired for ultra-low-field MRI systems. Here, we propose a triple-ring permanent magnet design that aims to preserve and improve upon the fundamental field homogeneity requirements of MR imaging at ultra-low-field, without sacrificing the flexibility to perform both body and head imaging.