Simulation and analysis of split gradient coil performance in MRI

Liu, Limei, Sanchez Lopez, Hector, Poole, Michael, Liu, Feng and Crozier, Stuart (2011). Simulation and analysis of split gradient coil performance in MRI. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC, 2011. Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC, 2011, Boston, MA, United States, (4149-4152). 30 August-3 September 2011. doi:10.1109/IEMBS.2011.6091030


Author Liu, Limei
Sanchez Lopez, Hector
Poole, Michael
Liu, Feng
Crozier, Stuart
Title of paper Simulation and analysis of split gradient coil performance in MRI
Conference name Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC, 2011
Conference location Boston, MA, United States
Conference dates 30 August-3 September 2011
Proceedings title Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC, 2011   Check publisher's open access policy
Journal name Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS   Check publisher's open access policy
Place of Publication Piscataway, NJ, United States
Publisher IEEE
Publication Year 2011
Sub-type Fully published paper
DOI 10.1109/IEMBS.2011.6091030
ISBN 9781424441211
ISSN 1557-170X
Start page 4149
End page 4152
Total pages 4
Collection year 2012
Language eng
Abstract/Summary Split magnet systems for hybrid imaging, such as positron emission tomography-magnetic resonance imaging (PET-MRI) and Radiotherapy-MRI, require gradient coils designed with similar shapes as their corresponding main magnet. This introduces challenges in the gradient coil design of good performance and manufacturing. In this paper the effect of the gap size in shielded transverse split gradient coils and split cryostat “warm” bore over the coil efficiency, shielding efficiency, wire spacing, cryostat ohmic power loss and mechanical vibration have been simulated and studied. A “free-surface” gradient coil design method was used to design the split, actively-shielded transverse gradient coils with an axial gap. A network method was used to calculate the eddy currents induced in the split cryostat “warm” bore. The shielding efficiency and the minimum wire spacing were found to decrease when the size of the central gap is increased. The ohmic power loss and the amplitude of the radial vibrations in the split cryostat “warm” bore increases when the gap size in the gradient coil and “warm” bore is increased. It is hoped that these investigations will be useful for the development of new hybrid imaging modalities involving MRI.
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Tue, 20 Dec 2011, 13:22:44 EST by Ms Deborah Brian on behalf of School of Information Technol and Elec Engineering