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

Oezerdem, C.; Winter, L.; Graessl, A.; Paul, K.; Els, A.; Weinberger, O.; Rieger, J.; Kuehne, A.; Dieringer, M.; Hezel, F.; Voit, D.; Frahm, J.; Niendorf, Thoralf

doi:10.1002/mrm.25840

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

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Voit, D.
Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society;

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Frahm, J.
Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society;

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http://onlinelibrary.wiley.com/doi/10.1002/mrm.25840/epdf
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Citation

Oezerdem, C., Winter, L., Graessl, A., Paul, K., Els, A., Weinberger, O., et al. (2016). 16-channel bow tie antenna transceiver array for cardiac MR at 7.0 tesla. Magnetic Resonance in Medicine, 75(6), 2553-2565. doi:10.1002/mrm.25840.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0028-2BB5-F

Abstract

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.