Brain imaging with improved acceleration and SNR at 7 Tesla obtained with 64-channel receive array

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Kamil UğurbilGregor Adriany

Abstract

Despite the clear synergy between high channel counts in a receive array and magnetic fields ≥ 7 Tesla, to date such systems have been restricted to a maximum of 32 channels. Here, we examine SNR gains at 7 Tesla in unaccelerated and accelerated images with a 64-receive channel (64Rx) RF coil. A 64Rx coil was built using circular loops tiled in 2 separable sections of a close-fitting form; custom designed preamplifier boards were integrated into each coil element. A 16-channel transmitter arranged in 2 rows along the z-axis was employed. The performance of the 64Rx array was experimentally compared to that of an industry-standard 32-channel receive (32Rx) array for SNR in unaccelerated images and for noise amplification under parallel imaging. SNR gains were observed in the periphery but not in the center of the brain in unaccelerated imaging compared to the 32Rx coil. With either 1D or 2D undersampling of k-space, or with slice acceleration together with 1D undersampling of k-space, significant reductions in g-factor noise were observed throughout the brain, yielding effective gains in SNR in the entire brain compared to the 32Rx coil. Task-based FMRI data with 12-fold 2D (slice and phase-encode) acceleration yielded excellent...Continue Reading

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Citations

Nov 14, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Seng-Wei ChiehSteen Moeller
Feb 23, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Phillip DiGiacomoMichael Zeineh
Mar 3, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Steen MoellerKamil Ugurbil
Jun 21, 2020·Journal of Magnetic Resonance Imaging : JMRI·Steen MoellerKamil Ugurbil
May 14, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jérémie ClémentÖzlem Ipek
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Apr 4, 2021·Tomography : a Journal for Imaging Research·Tzu-Wei LeeHua-Shan Liu
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