Analysis of the Noise Correlation in MRI Coil Arrays Loaded With Metamaterial Magnetoinductive Lenses

A numerical method is shown for calculating the noise correlation coefficient in arrays of magnetic resonance imaging (MRI) coils loaded with capacitively-loaded ring metamaterial lenses, and in the presence of a conducting half-space resembling a sample. This numerical method is validated by compar...

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Bibliographic Details
Published in:IEEE transactions on medical imaging 2015-05, Vol.34 (5), p.1148-1154
Main Authors: Algarin, Jose M., Breuer, Felix, Behr, Volker C., Freire, Manuel J.
Format: Article
Language:English
Subjects:
Aircraft
Coils
Computer Simulation
Correlation
Lenses
Magnetic resonance imaging
Magnetic Resonance Imaging - instrumentation
Magnetic Resonance Imaging - standards
Metamaterials
NMR
Noise
Nuclear magnetic resonance
parallel imaging
Phantoms, Imaging
Signal to noise ratio
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Summary:A numerical method is shown for calculating the noise correlation coefficient in arrays of magnetic resonance imaging (MRI) coils loaded with capacitively-loaded ring metamaterial lenses, and in the presence of a conducting half-space resembling a sample. This numerical method is validated by comparison with experimental results obtained in two different experimental procedures for double check: noise resistance measurements with a network analyzer and noise correlation measurements in an MRI system. It is found that, for practical array configurations such as overlapping coils or capacitively-decoupled coils, the noise correlation coefficient turns negative for coils loaded with metamaterial lenses. In particular, the analysis is carried out with metamaterial structures known as magnetoinductive lenses, which have been demonstrated in previous works to improve the signal-to-noise ratio of MRI coils. Results are also shown to demonstrate that negative noise correlations have as an effect the improvement of the g-factor in coil arrays for parallel MRI.
ISSN:0278-0062
1558-254X
DOI:10.1109/TMI.2014.2377792