Print Email Facebook Twitter Gradient Coil Design and Construction for a Halbach Based MRI System Title Gradient Coil Design and Construction for a Halbach Based MRI System Author de Vos, Bart (TU Delft Electrical Engineering, Mathematics and Computer Science) Contributor Remis, R.F. (mentor) Fuchs, P.S. (graduation committee) Degree granting institution Delft University of Technology Project Low Field MRI Date 2019-06-26 Abstract MRI as a medical diagnostics tool is still unavailable to the majority of the developing world. Therefore the design and development of new low-cost hardware are essential. The design of gradient coils corresponding to this hardware is necessary for conventional imaging and reconstruction methods to be used. The target field method, which was originally developed to deal with longitudinal main magnetic fields, is applied to a transverse field, as produced by a Halbach permanent magnet array. Using this method current densities for gradient fields in the three spatial directions are derived. Subsequently, using stream functions, wire patterns for the three gradient coils are determined. These are verified using a commercial magneto-static solver. Furthermore, one of the gradients is constructed to validate the performance of the method. The measured fields are in good agreement with the simulations and their prescribed target fields. This confirms that the proposed method provides a reliable way to design and manufacture gradient coils for various requirements. Based on the experimental review of the constructed coil three optimized gradients are proposed for the low field MRI system developed at the LUMC in cooperation with the TU Delft. The method can also be readily generalized to other geometries and requirements due to the robust fundamental physical basis and accuracy with respect to computer simulations. Subject MRIGradient CoilsTarget FieldTransverse fieldHalbach To reference this document use: http://resolver.tudelft.nl/uuid:bb09923a-e4b8-45b9-969e-c614e53cdc66 Embargo date 2024-03-28 Part of collection Student theses Document type master thesis Rights © 2019 Bart de Vos Files PDF Msc_Thesis_BdV_Final.pdf 8.55 MB Close viewer /islandora/object/uuid:bb09923a-e4b8-45b9-969e-c614e53cdc66/datastream/OBJ/view