16-channel bow tie antenna transceiver array for cardiac MR at 7.0 tesla

Purpose To design, evaluate, and apply a bow tie antenna transceiver radiofrequency (RF) coil array tailored for cardiac MRI at 7.0 Tesla (T). Methods The radiofrequency (RF) coil array comprises 16 building blocks each containing a bow tie shaped λ/2‐dipole antenna. Numerical simulations were used...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2016-06, Vol.75 (6), p.2553-2565
Main Authors: Oezerdem, Celal, Winter, Lukas, Graessl, Andreas, Paul, Katharina, Els, Antje, Weinberger, Oliver, Rieger, Jan, Kuehne, Andre, Dieringer, Matthias, Hezel, Fabian, Voit, Dirk, Frahm, Jens, Niendorf, Thoralf
Format: Article
Language:English
Subjects:
Adult
cardiovascular MRI
electrical dipole
Equipment Design
Female
Heart - diagnostic imaging
Humans
Image Processing, Computer-Assisted - methods
Magnetic Resonance Imaging, Cine - instrumentation
Magnetic Resonance Imaging, Cine - methods
Male
parallel imaging
Phantoms, Imaging
RF coil
Signal Processing, Computer-Assisted - instrumentation
Signal-To-Noise Ratio
transceiver array
Transducers
ultrahigh field MRI
Young Adult
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Summary:Purpose To design, evaluate, and apply a bow tie antenna transceiver radiofrequency (RF) coil array tailored for cardiac MRI at 7.0 Tesla (T). Methods The radiofrequency (RF) coil array comprises 16 building blocks each containing a bow tie shaped λ/2‐dipole antenna. Numerical simulations were used for transmission field homogenization and RF safety validation. RF characteristics were examined in a phantom study. The array's suitability for high spatial resolution two‐dimensional (2D) CINE imaging and for real time imaging of the heart was examined in a volunteer study. Results The arrays transmission fields and RF characteristics are suitable for cardiac MRI at 7.0T. The coil performance afforded a spatial resolution as good as (0.8 × 0.8 × 2.5) mm3 for segmented 2D CINE MRI at 7.0T which is by a factor of 12 superior versus standardized protocols used in clinical practice at 1.5T. The proposed transceiver array supports 1D acceleration factors of up to R = 6 without impairing image quality significantly. Conclusion The 16‐channel bow tie antenna transceiver array supports accelerated and high spatial resolution cardiac MRI. The array is compatible with multichannel transmission and provides a technological basis for future clinical assessment of parallel transmission techniques at 7.0 Tesla. Magn Reson Med 75:2553–2565, 2016. © 2015 Wiley Periodicals, Inc.
ISSN:0740-3194
1522-2594
DOI:10.1002/mrm.25840