Please use this identifier to cite or link to this item: https://doi.org/10.1049/iet-smt:20080033
Title: A new decoupling method for phased arrays in magnetic resonance imaging: An experimental approach
Authors: Li, B.K.
Hui, H.T. 
Yang, C.H.
Crozier, S.
Issue Date: 2008
Source: Li, B.K., Hui, H.T., Yang, C.H., Crozier, S. (2008). A new decoupling method for phased arrays in magnetic resonance imaging: An experimental approach. IET Science, Measurement and Technology 2 (5) : 317-325. ScholarBank@NUS Repository. https://doi.org/10.1049/iet-smt:20080033
Abstract: A new decoupling method for magnetic resonance imaging (MRI) phased arrays is studied by experimental measurements. A laboratory measurement setup is built to characterise the signal coupling paths and their coupling strengths. A new concept, the receiving mutual impedance, is introduced to measure the coupled signals between the phased array elements. Measured values of the receiving mutual impedances for a typical two-element surface-coil array are obtained and used in other experiments to find the uncoupled voltages from the received voltages. Results show that the new decoupling method is both accurate and robust over a wide frequency range. Comparison of the uncoupled voltages with the actual ideal uncoupled voltages confirms that if the position of the signal source is known, almost error-free uncoupled voltages can be obtained. The errors resulted from a change of the position of the signal source are also measured and it is found that they generally increase with the deviation of the signal source from its position where the receiving mutual impedances are measured. The maximum error of the uncoupled voltages is found to be below 10 when the signal source changes its position over a distance of half the length of a surface coil. Over this distance change, the signal isolation between the two surface coils is found to be at least 20dB, whereas the maximum is more than 300dB. The results demonstrate the effectiveness and the feasibility of the new decoupling method for use in MRI phased arrays. © 2008 The Institution of Engineering and Technology.
Source Title: IET Science, Measurement and Technology
URI: http://scholarbank.nus.edu.sg/handle/10635/54507
ISSN: 17518822
DOI: 10.1049/iet-smt:20080033
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

4
checked on Dec 6, 2017

WEB OF SCIENCETM
Citations

3
checked on Nov 17, 2017

Page view(s)

23
checked on Dec 10, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.