A low-field portable magnetic resonance imaging system for head imaging

In this paper, we present the progress of the development and design of a portable low-field (<; 0.1 T) magnetic resonance imaging (MRI) scanner for head imaging. It includes the design, optimization, and implementation of Halbach-array-based permanent magnet array that provides B ₀ field with the merits of light weight and helium free, the work done on transmit and receive RF coils, the progress on the nonlinear imaging reconstruction algorithm based on a inhomogeneous B ₀ field provided by the magnet array, and the testing on a Magritek NMR spectrometer console.