Simulation and analysis of the interactions between split gradient coils and a split magnet cryostat in an MRI-PET system

Liu, Limei, Sanchez-Lopez, Hector, Poole, Michael, Liu, Feng and Crozier, Stuart (2012) Simulation and analysis of the interactions between split gradient coils and a split magnet cryostat in an MRI-PET system. Journal of Magnetic Resonance, 222 8-15. doi:10.1016/j.jmr.2012.05.022


Author Liu, Limei
Sanchez-Lopez, Hector
Poole, Michael
Liu, Feng
Crozier, Stuart
Title Simulation and analysis of the interactions between split gradient coils and a split magnet cryostat in an MRI-PET system
Journal name Journal of Magnetic Resonance   Check publisher's open access policy
ISSN 1090-7807
1096-0856
Publication date 2012-09
Sub-type Article (original research)
DOI 10.1016/j.jmr.2012.05.022
Volume 222
Start page 8
End page 15
Total pages 8
Place of publication Maryland Heights, MO, United States
Publisher Academic Press
Collection year 2013
Language eng
Formatted abstract
Splitting a magnetic resonance imaging (MRI) magnet into two halves can provide a central region to accommodate other modalities, such as positron emission tomography (PET). This approach, however, produces challenges in the design of the gradient coils in terms of gradient performance and fabrication. In this paper, the impact of a central gap in a split MRI system was theoretically studied by analysing the performance of split, actively-shielded transverse gradient coils. In addition, the effects of the eddy currents induced in the cryostat on power loss, mechanical vibration and magnetic field harmonics were also investigated. It was found, as expected, that the gradient performance tended to decrease as the central gap increased. Furthermore, the effects of the eddy currents were heightened as a consequence of splitting the gradient assembly into two halves. An optimal central gap size was found, such that the split gradient coils designed with this central gap size could produce an engineering solution with an acceptable trade-off between gradient performance and eddy current effects. These investigations provide useful information on the inherent trade-offs in hybrid MRI imaging systems.
Keyword Split gradient coil
Mri-Pet
Gradient performance
Eddy current effects
Design
Geometry
Generation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Information Technology and Electrical Engineering Publications
 
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