Hybrid numerical techniques for the modelling of radiofrequency coils in MRI

Li, Bing Keong, Liu, Feng, Weber, Ewald and Crozier, Stuart (2009) Hybrid numerical techniques for the modelling of radiofrequency coils in MRI. NMR in Biomedicine, 22 9: 937-951. doi:10.1002/nbm.1344


Author Li, Bing Keong
Liu, Feng
Weber, Ewald
Crozier, Stuart
Title Hybrid numerical techniques for the modelling of radiofrequency coils in MRI
Journal name NMR in Biomedicine   Check publisher's open access policy
ISSN 0952-3480
1099-1492
Publication date 2009-11
Year available 2008
Sub-type Article (original research)
DOI 10.1002/nbm.1344
Volume 22
Issue 9
Start page 937
End page 951
Total pages 15
Place of publication Bognor Regis, West Sussex, U.K.
Publisher John Wiley & Sons
Language eng
Subject 090303 Biomedical Instrumentation
090399 Biomedical Engineering not elsewhere classified
861502 Medical Instruments
970109 Expanding Knowledge in Engineering
CX
Formatted abstract
Radiofrequency (RF) coils for use in MRI can have a significant effect on both the signal-to-noise-ratio of MR images and the specific absorption rate inside the biological sample. In the past, prototypes were constructed and tested to investigate the performance of the RF coils and often required several iterations to achieve an acceptable result. However, with the advancement in computational electromagnetic techniques, RF coil modelling has now become the modus operandi of coil design because it can produce accurate numerical results, thus reducing the time and effort spent in designing and prototyping RF coils. Two hybrid methods –method of moments (MoM)/finite difference time domain (FDTD) and MoM/finite element method (FEM) – for RF coil modelling are presented herein. The paper provides a brief overview of FDTD, FEM and MoM. It discusses the hybridisation of these methods and how they are integrated to form versatile techniques. The numerical results obtained from these hybrid methods are compared with experimental results from prototype coils over a range of operating frequencies. The methods are then applied to the design of a new type of phased-array coil – the rotary phased array. From these comparisons, it can be seen that the numerical methods provide a useful aid for the design and optimisation of RF coils for use in MRI.
Keyword MRI
Radiofrequency coil modelling
Hybrid method
Finite difference time domain (FDTD)
Finite element method (FEM)
Method of moments (MoM)
Hybrid MoM/FDTD
Hybrid MoM/FEM
High-field MRI
Time-domain method
Finite-difference
Human head
Surface coil
RF coils
Electromagnetic scattering
Birdcage coil
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Article first published online: 16 DEC 2008

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Information Technology and Electrical Engineering Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 11 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 29 Nov 2009, 00:01:51 EST