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Abstract #0063

A New Approach to Shimming Halbach Arrays Using Higher Order Halbach Array Inserts

Thomas O'Reilly1, Wouter Teeuwisse1, and Andrew Webb1
1Radiology, Leiden University Medical Center, Leiden, Netherlands


Halbach arrays are an appealing magnet design for low field MRI due to their low weight and cost typically suffer from relatively high B0 inhomogeneity. In this work we show a new approach to shimming Halbach arrays using higher order Halbach inserts which can be designed to target specific spherical harmonic terms. We demonstrate the principle by correcting for the x2-y2 spherical harmonic, improving B0 homogeneity of a 31cm diameter bore Halbach array by 50% and show that in simulations homogeneities of 280 ppm can be achieved over a 20 cm sphere by correcting up to 5th order spherical harmonics.

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