Magn Reson Mater Phy (2018) 31:355–366 https://doi.org/10.1007/s10334-017-0657-5 RESEARCH ARTICLE Manipulating transmit and receive sensitivities of radiofrequency surface coils using shielded and unshielded high‑permittivity materials 1,2,3 1,3 1,2,3 Manushka V. Vaidya · Cem M. Deniz · Christopher M. Collins · 1,2,3 1,2,3 Daniel K. Sodickson · Riccardo Lattanzi Received: 15 June 2017 / Revised: 29 September 2017 / Accepted: 2 October 2017 / Published online: 6 November 2017 © ESMRMB 2017 Abstract Conclusion Strategically positioning HPM at a distance Objective To use high-permittivity materials (HPM) posi- from a surface coil or array can increase the overlap between tioned near radiofrequency (RF) surface coils to manipulate excitation/reception sensitivities, and extend the FOV of a transmit/receive field patterns. single coil for reduction of the number of channels in an Materials and methods A large HPM pad was placed array while minimally affecting the SNR. below the RF coil to extend the field of view (FOV). The resulting signal-to-noise ratio (SNR) was compared with Keywords Magnetic Resonance Imaging · that of other coil configurations covering the same FOV in Electromagnetic Fields · Computer Simulation simulations and experiments at 7 T. Transmit/receive effi - ciency was evaluated when HPM discs with or without a partial shield were positioned at a distance from the coil. Introduction Finally, we evaluated
Magnetic Resonance Materials in Physics, Biology and Medicine – Springer Journals
Published: Nov 6, 2017
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