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  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., 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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-2BB5-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-80A5-5
Genre: Journal Article

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2179877.pdf (Publisher version), 9MB
 
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 Creators:
Oezerdem, C., Author
Winter, L., Author
Graessl, A., Author
Paul, K., Author
Els, A., Author
Weinberger, O., Author
Rieger, J., Author
Kuehne, A., Author
Dieringer, M., Author
Hezel, F., Author
Voit, D.1, Author              
Frahm, J.1, Author              
Niendorf, Thoralf, Author
Affiliations:
1Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society, ou_578634              

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Free keywords: ultrahigh field MRI; cardiovascular MRI; electrical dipole; transceiver array; RF coil; parallel imaging
 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.

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Language(s): eng - English
 Dates: 2015-07-172016-06
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1002/mrm.25840
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Pages: - Volume / Issue: 75 (6) Sequence Number: - Start / End Page: 2553 - 2565 Identifier: -