In vivo 3D brain and extremity MRI at 50 mT using a permanent magnet Halbach array.

ABSTRACT:

Purpose

To design a low-cost, portable permanent magnet-based MRI system capable of obtaining in vivo MR images within a reasonable scan time.

Methods

A discretized Halbach permanent magnet array with a clear bore diameter of 27 cm was designed for operation at 50 mT. Custom-built gradient coils, RF coil, gradient amplifiers, and RF amplifier were integrated and tested on both phantoms and in vivo.

Results

Phantom results showed that the gradient nonlinearity in the y-direction and z-direction was less than 5% over a 15-cm FOV and did not need correcting. For the x-direction, it was significantly greater, but could be partially corrected in postprocessing. Three-dimensional in vivo scans of the brain of a healthy volunteer using a turbo spin-echo sequence were acquire

SUBMITTER: O'Reilly T 

PROVIDER: S-EPMC7689769 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature