Regular ArticleResonant Modes of the Birdcage Coil
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Design of a RF-resonant set improving locally the B1+ efficiency. Applications for clinical MRI in andrology and urology
2020, Journal of Magnetic ResonanceCitation Excerpt :Capacitors were formed as structural capacity between metal patches on one side of the PCB and full metallization on its other side. The described resonator has four eigenmodes [19] and direct mode order resulting in the magnetic dipole mode (referred to as the “first” mode for the birdcage-type resonators [21]) orthogonal to legs having lowest frequency. It is only the excitation of this first eigenmode that provides highly homogeneous B1+ field distribution within the coil volume with the maximum field value in the centre of the cylinder (Fig. 1, C).
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