Gradient Coil Design and Realization for a Halbach-Based MRI System

Journal article (2020)

Authors

Bart De Vos Student

P.S. Fuchs Signal Processing Systems -

Tom O’Reilly Leiden University Medical Center

A. Webb Signal Processing Systems -

R.F. Remis Signal Processing Systems -

Research Group

Signal Processing Systems () (TU Delft)

DOI: https://doi.org/10.1109/TMAG.2019.2958561

Low field Gradient coils Halbach arrays Magnetic resonance imaging (MRI) Target field method

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http://resolver.tudelft.nl/uuid:07a2be0d-8a4e-4ef5-9548-f2f38302b0e2

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Published Date

2020

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Signal Processing Systems

Abstract

In this article, we design and construct gradient coils for a Halbach permanent-magnet array magnetic resonance (MR) scanner. The target field method, which is widely applied for the case of axial static magnetic fields, has been developed for a transverse static magnetic field as produced by a Halbach permanent-magnet array. Using this method, current densities for three gradient directions are obtained and subsequently verified using a commercial magneto-static solver. Stream functions are used to turn the surface current densities into wire patterns for constructing the gradient coils. The measured fields are in good agreement with simulations and their prescribed target fields. 3-D images have been acquired using the constructed gradient coils with a very low degree of geometric distortion.

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