Designs for a 50 cm long 27 cm clear bore Halbach array of 12 x 12 x 12 mm permanent magnets to create a homogeneous field suitable for neurological MRI
Thomas O’Reilly¹, Wouter Teeuwisse¹, Andrew Webb¹
10 000€ (includes machining costs)
This project describes the construction of a 27 cm diameter, 50 cm long homogeneous Halbach array magnet. It consists of 23 rings, each with two layers of 12x12x12 permanent magnets. Design files are provided for those wanting to laser cut, CNC mill, or water-jet cut the positions of the magnets. For different-sized magnets, a genetic algorithm for homogeneity optimization is available (which can also be used for additional shimming), as is a programme for gradient coil design.
- O’Reilly, W.Teeuwisse, D.Gans, K.Koolstra, A.G.Webb. In vivo 3D brain and extremity MRI at 50 mT using a permanent magnet Halbach array. Magn.Reson.Med. 2020. DOI: 10.1002/mrm.28396
- Bart de Vos , Patrick Fuchs, Thomas O’Reilly, Andrew Webb and Rob Remis. Gradient Coil Design and Realization for a Halbach-Based MRI System, IEEE Transactions on Magnetics, 56, 3, 2020. DOI: 10.1109/TMAG.2019.2958561.
- O’Reilly, W.M.Teeuwisse and A.G.Webb, Three-dimensional MRI in a homogenous 27 cm diameter Bore Halbach Array Magnet, J Magn Reson. 2019 Oct;307:106578. doi: 10.1016/j.jmr.2019
1C.J. Gorter Center for High Field MRI, Leiden University Medical Center, Leiden, The Netherlands