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Related Experiment Video

Updated: Jan 20, 2026

A Paired Bead and Magnet Array for Molding Microwells with Variable Concave Geometries

A Paired Bead and Magnet Array for Molding Microwells with Variable Concave Geometries

Published on: January 28, 2018

Three-dimensional MRI in a homogenous 27 cm diameter bore Halbach array magnet.

T O'Reilly¹, W M Teeuwisse¹, A G Webb¹

¹C.J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)

|August 31, 2019

Summary

This study introduces a low-cost, head-only Halbach magnet array for Magnetic Resonance Imaging (MRI). This innovation aims to improve access to neuroimaging technology, particularly for pediatric patients in underserved regions.

Keywords:

Halbach array Hydrocephalus Low field MRI Permanent magnets Sustainable MRI

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Published on: October 20, 2009

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Last Updated: Jan 20, 2026

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Published on: January 28, 2018

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Published on: June 21, 2024

Noninvasive In Vivo Small Animal MRI and MRS: Basic Experimental Procedures

Noninvasive In Vivo Small Animal MRI and MRS: Basic Experimental Procedures

Published on: October 20, 2009

Area of Science:

Medical Imaging
Biophysics
Magnetics

Background:

High-cost Magnetic Resonance Imaging (MRI) systems limit global access to advanced medical imaging.
Pediatric neuroimaging is crucial but often inaccessible in low-resource settings due to equipment costs.

Purpose of the Study:

To develop a low-cost, homogenous Halbach magnet array for head-only MRI.
To enable pediatric neuroimaging in resource-limited environments.

Main Methods:

Designed a homogenous Halbach magnet array with variable diameter and internal shim magnets.
Achieved a 27 cm bore diameter, 50.4 mT mean field strength, and 2400 ppm homogeneity over a 20 cm spherical volume.
Acquired 3D images of a brain phantom with 3.5 mm isotropic resolution using a spin-echo sequence.

Main Results:

The constructed Halbach array demonstrated significant homogeneity suitable for coil-based gradients.
Demonstrated feasibility of 3D neuroimaging with the low-cost MRI system.
Acquired images over a 22 cm field of view with high isotropic resolution.

Conclusions:

The developed low-cost Halbach magnet array shows promise for accessible pediatric neuroimaging.
Future integration with open-source components could create a fully open-source, affordable MRI system.
This technology has the potential to bridge the gap in neuroimaging access for underserved populations.