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01.10.2012 | Magnetic Resonance

Comparison of three multichannel transmit/receive radiofrequency coil configurations for anatomic and functional cardiac MRI at 7.0T: implications for clinical imaging

verfasst von: Lukas Winter, Peter Kellman, Wolfgang Renz, Andreas Gräßl, Fabian Hezel, Christof Thalhammer, Florian von Knobelsdorff-Brenkenhoff, Valeriy Tkachenko, Jeanette Schulz-Menger, Thoralf Niendorf

Erschienen in: European Radiology | Ausgabe 10/2012

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Abstract

Objectives

To implement, examine, and compare three multichannel transmit/receive coil configurations for cardiovascular MR (CMR) at 7T.

Methods

Three radiofrequency transmit-receive (TX/RX) coils with 4-, 8-, and 16-coil elements were used. Ten healthy volunteers (seven males, age 28 ± 4 years) underwent CMR at 7T. For all three RX/TX coils, 2D CINE FLASH images of the heart were acquired. Cardiac chamber quantification, signal-to-noise ratio (SNR) analysis, parallel imaging performance assessment, and image quality scoring were performed.

Results

Mean total examination time was 29 ± 5 min. All images obtained with the 8- and 16-channel coils were diagnostic. No significant difference in ejection fraction (EF) (P > 0.09) or left ventricular mass (LVM) (P > 0.31) was observed between the coils. The 8- and 16-channel arrays yielded a higher mean SNR in the septum versus the 4-channel coil. The lowest geometry factors were found for the 16-channel coil (mean ± SD 2.3 ± 0.5 for R = 4). Image quality was rated significantly higher (P < 0.04) for the 16-channel coil versus the 8- and 4-channel coils.

Conclusions

All three coil configurations are suitable for CMR at 7.0T under routine circumstances. A larger number of coil elements enhances image quality and parallel imaging performance but does not impact the accuracy of cardiac chamber quantification.

Key Points

• Cardiac chamber quantification using 7.0T magnetic resonance imaging is feasible.

• Examination times for cardiac chamber quantification at 7.0T match current clinical practice.

• Multichannel transceiver RF technology facilitates improved image quality and parallel imaging performance.

• Increasing the number of RF channels does not influence cardiac chamber quantification.

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Titel: Comparison of three multichannel transmit/receive radiofrequency coil configurations for anatomic and functional cardiac MRI at 7.0T: implications for clinical imaging
verfasst von: Lukas Winter
Peter Kellman
Wolfgang Renz
Andreas Gräßl
Fabian Hezel
Christof Thalhammer
Florian von Knobelsdorff-Brenkenhoff
Valeriy Tkachenko
Jeanette Schulz-Menger
Thoralf Niendorf
Publikationsdatum: 01.10.2012
Verlag: Springer-Verlag
Erschienen in: European Radiology / Ausgabe 10/2012
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-012-2487-1

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Comparison of three multichannel transmit/receive radiofrequency coil configurations for anatomic and functional cardiac MRI at 7.0T: implications for clinical imaging