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Abstract #4034

An axial gradient coil with improved linearity for Halbach-based MR systems

Bart de Vos1, Thomas O'Reilly1, Wouter Teeuwisse1, Rob Remis2, and Andrew Webb1
1C.J. Gorter Center for High Field MRI, Leiden University Medical Center, Leiden, Netherlands, 2Circuits and Systems, Delft University of Technology, Delft, Netherlands

We reduced image artifacts and increased the attainable axial field-of-view by designing a highly linear x-gradient coil for Halbach array-based MR systems. A truncated sum of sinusoidal basis function is used for the current density. Higher order modes combined with specifying the target field inside a volume lead to a stable solution of the inverse source problem. The coil was installed on our 50 mT system and resulted in a 150% increase in linear DSV with respect to our previously designed gradient coil. Whole-brain three-dimensional images have been acquired using turbo spin echo sequences in less than 10 minutes.

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