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.
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