MRI at 2.15 MHz in a low-cost Halbach-based scanner for pediatric neuroimaging

摘要

Halbach arrays are an attractive approach to building low-field MRI systems due to their relatively high magnetic field strength and very low stray fields. B_0 homogeneity of finite length Halbach arrays is, however, significantly reduced which has prevented the use of FFT-based image reconstructions in Halbach arrays with a sufficiently large bore size for human imaging~1. In this work we set out to build a Halbach array-based magnet with a sufficiently large bore for imaging hydrocephalus in young children. The homogeneity of the Halbach array is optimised by varying the radius of the array along the length of the magnet.