An optimized solenoidal head radiofrequency coil for low-field magnetic resonance imaging |
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| Authors: | Barbara Blasiak Vyacheslav Volotovskyy Charlie Deng Boguslaw Tomanek |
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| Affiliation: | aInstitute of Nuclear Physics, Polish Academy of Sciences, Krakow 31-342, Poland;bExperimental Imaging Centre, Department of Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada T2N 4N1;cInstitute for Biodiagnostics, National Research Council of Canada, Winnipeg, Manitoba, Canada R3B 1Y6 |
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| Abstract: | Applications of low-field magnetic resonance imaging (MRI) systems (<0.3 T) are limited due to the signal-to-noise ratio (SNR) being lower than that provided by systems based on superconductive magnets (≥1.5 T). Therefore, the design of radiofrequency (RF) coils for low-field MRI requires careful consideration as significant gains in SNR can be achieved with the proper design of the RF coil. This article describes an analytical method for the optimization of solenoidal coils. Coil and sample losses are analyzed to provide maximum SNR and optimum B1 field homogeneity. The calculations are performed for solenoidal coils optimized for the human head at 0.2 T, but the method could also be applied to any solenoidal coil for imaging other anatomical regions at low field. Several coils were constructed to compare experimental and theoretical results. A head magnetic resonance image obtained at 0.2 T with the optimum design is presented. |
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| Keywords: | MRI RF coil Solenoidal coil Low-field MRI B1 field SNR |
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