Geometry comparisons of an 11‐T coaxial reentrant cavity (ReCav) coil

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Abstract
The continual march to higher magnetic fields for MRI/S has brought about a change in RF coil methodology that incorporates the use of cavity designs. One such design, the ReCav coil, has shown improvement in signal‐to‐noise (SNR) over standard low‐pass birdcages. This work studies the relationship between cavity geometry and coil performance. Five variations of the ReCav were built where either the diameter ratio between the inner and outer cylinders or the extent of reentrant wall were varied. The Q‐damping and SNR were measured for each design. It is shown that the reentrant wall in the ReCav plays an important role in improving the performance of the coil. © 2003 Wiley Periodicals, Inc. Concepts Magn Reson Part B (Magn Reson Engineering) 18B: 24–27, 2003