Design of sparse Halbach magnet arrays for portable MRI using a genetic algorithm.

ABSTRACT: Permanent magnet arrays offer several attributes attractive for the development of a low-cost portable MRI scanner for brain imaging. They offer the potential for a relatively lightweight, low to mid-field system with no cryogenics, a small fringe field, and no electrical power requirements or heat dissipation needs. The cylindrical Halbach array, however, requires external shimming or mechanical adjustments to produce B₀ fields with standard MRI homogeneity levels (e.g., 0.1 ppm over FOV), particularly when constrained or truncated geometries are needed, such as a head-only magnet where the magnet length is constrained by the shoulders. For portable scanners using rotation of the magnet for spatial encoding with generalized projections, the spatial pattern of the field is impor

SUBMITTER: Cooley CZ 

PROVIDER: S-EPMC5937527 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature