Arrays of permanent magnets have shown promise as a relatively light weight, low cost, sustainable way of generating magnetic fields suitable for MRI. In this work we show the design of a new homogenous helmet shaped, Halbach-array based magnet optimized for imaging the adult head. The magnet has a mean magnetic field strength of 59.7 mT and a homogeneity of 1313 ppm over a brain sized 25x20x15 cm3 ellipsoid. By truncating one side of the magnet the weight of the system has been reduced compared to symmetric designs while increasing the obtained field strength.
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