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A geometrically adjustable 16-channel transmit/receive transmission line array for improved RF efficiency and parallel imaging performance at 7 Tesla.
Authors:Gregor Adriany  Pierre‐Francois Van de Moortele  Johannes Ritter  Steen Moeller  Edward J. Auerbach  Can Akgün  Carl J. Snyder  Thomas Vaughan  Kâmil Uğurbil
Affiliation:Center for Magnetic Resonance Research, Department of Radiology, School of Medicine, University of Minnesota, Minneapolis, USA 55455, USA. gregor@cmrr.umn.edu
Abstract:A novel geometrically adjustable transceiver array system is presented. A key feature of the geometrically adjustable array was the introduction of decoupling capacitors that allow for automatic change in capacitance dependent on neighboring resonant element distance. The 16-element head array version of such an adjustable coil based on transmission line technology was compared to fixed geometry transmission line arrays (TLAs) of various sizes at 7T. The focus of this comparison was on parallel imaging performance, RF transmit efficiency, and signal-to-noise ratio (SNR). Significant gains in parallel imaging performance and SNR were observed for the new coil and attributed to its adjustability and to the design of the individual elements with a three-sided ground plane.
Keywords:RF coil design  7T  transmit array coil  parallel imaging  high‐field MRI  transmission line coil  flexible array coil
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