Abstract #3568

COSI Magnet: Halbach Magnet and Halbach Gradient Designs for Open Source Low Cost MRI

Lukas Winter¹, Antonia Barghoorn¹, Peter Blümler², and Thoralf Niendorf^1,3,4

¹Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine, Berlin, Germany, ²Institute of Physics, University of Mainz, Mainz, Germany, ³Experimental and Clinical Research Center (ECRC), a joint cooperation between the Charité Medical Faculty and the Max Delbrück Center for Molecular Medicine, Berlin, Germany, ⁴MRI.TOOLS GmbH, Berlin, Germany

Cost effective open source imaging (COSI) is a collaborative initiative currently building an affordable low field open source MR scanner with the technical documentation available at www.opensourceimaging.org. As part of this initiative uniform Halbach magnets have been evaluated in absolute B0, field homogeneity, magnet mass and costs. Halbach quadrupoles are introduced, that produce an adjustable constant gradient field for spatial encoding removing the need for high power gradient amplifiers. Combining these efforts an imaging magnet (B₀=0.3T, d_i=180mm) design is presented that can incorporate a Halbach gradient of 157mT/m. The results are encouraging for low cost low field MR applications.

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