Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 75, Issue 6, Pages 2553-2565Publisher
WILEY
DOI: 10.1002/mrm.25840
Keywords
ultrahigh field MRI; cardiovascular MRI; electrical dipole; transceiver array; RF coil; parallel imaging
Funding
- Helmholtz Association [ICEMED-Project 1210251]
- Federal Ministry of Education and Research: German Centre for Cardiovascular Research-BER 6.1
- EUROSTARS program [heaRT_4_EU, E!9340]
- BMBF (Federal Ministry of Education and Research, Germany) [FKZ 01QE1501B]
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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 lambda/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 x 0.8 x 2.5) mm(3) 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. (C) 2015 Wiley Periodicals, Inc.
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