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Modular 32-channel transceiver coil array for cardiac MRI at 7.0T

Item Type:Article
Title:Modular 32-channel transceiver coil array for cardiac MRI at 7.0T
Creators Name:Graessl, A. and Renz, W. and Hezel, F. and Dieringer, M.A. and Winter, L. and Oezerdem, C. and Rieger, J. and Kellman, P. and Santoro, D. and Lindel, T.D. and Frauenrath, T. and Pfeiffer, H. and Niendorf, T.
Abstract:Purpose: To design and evaluate a modular transceiver coil array with 32 independent channels for cardiac MRI at 7.0T. Methods: The modular coil array comprises eight independent building blocks, each containing four transceiver loop elements. Numerical simulations were used for B1+ field homogenization and radiofrequency (RF) safety validation. RF characteristics were examined in a phantom study. The array's suitability for accelerated high spatial resolution two-dimensional (2D) FLASH CINE imaging of the heart was examined in a volunteer study. Results: Transmission field adjustments and RF characteristics were found to be suitable for the volunteer study. The signal-to-noise intrinsic to 7.0T together with the coil performance afforded a spatial resolution of 1.1 × 1.1 × 2.5 mm3 for 2D CINE FLASH MRI, which is by a factor of 6 superior to standardized CINE protocols used in clinical practice at 1.5T. The 32-channel transceiver array supports one-dimensional acceleration factors of up to R = 4 without impairing image quality significantly. Conclusion: The modular 32-channel transceiver cardiac 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 7.0T.
Keywords:Ultrahigh-Field MRI, Cardiovascular MRI, Transceiver Array, Parallel Imaging
Source:Magnetic Resonance in Medicine
Page Range:276-290
Date:July 2014
Official Publication:https://doi.org/10.1002/mrm.24903
PubMed:View item in PubMed

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