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Abstract #1474

Permanent magnet based 3D spatial encoding for Ultra-Low field MRI

Michael W. Vogel1, Ruben Pellicer-Guridi1, Jiasheng Su1, Viktor Vegh1, and David C. Reutens1

1Centre for advanced imaging, University of Queensland, Brisbane, Australia

We explore the use of small permanent magnets moving along prescribed helical paths for spatial encoding in ultra-low field magnetic resonance systems based on Halbach arrays. A semi-analytical simulation method was developed to analyse different magnet path and orientations. For proof-of-concept, different helical magnet paths and lengths for one and two small magnets were considered to establish spatial encoding efficiency. We demonstrate that a single small encoding magnet moving around the sample in a single helical revolution can be used to generate 3D images via the method of back projection for image reconstruction.

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