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  Novel splittable N-Tx/2N-Rx transceiver phased array to optimize both signal-to-noise ratio and transmit efficiency at 9.4T

Avdievich, N., Giapitzakis, I., & Henning, A. (2016). Novel splittable N-Tx/2N-Rx transceiver phased array to optimize both signal-to-noise ratio and transmit efficiency at 9.4T. Magnetic Resonance in Medicine, 76(5), 1621-1628. doi:10.1002/mrm.26051.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-7957-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-21C1-F
Genre: Journal Article

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Avdievich, NI1, 2, Author              
Giapitzakis, IA1, 2, Author              
Henning, A1, 2, Author              
Affiliations:
1Research Group MR Spectroscopy and Ultra-High Field Methodology, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_2528692              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: Purpose The goal of this study was to optimize signal-to-noise ratio (SNR) and parallel receive (Rx) performance of ultrahigh field (UHF) (≥7T) transceiver arrays without compromising their transmit (Tx) efficiency. UHF transceiver head phased arrays with a tight fit improve Tx efficiency in comparison with Tx-only arrays, which are usually larger so that Rx-only arrays can fit inside. However, having ≥16 elements inside a head transceiver array presents decoupling problems. Furthermore, the available number of Tx channels is limited. Methods A prototype of a splittable transceiver phased array was constructed. The array consisted of four flat surface Tx loops positioned in two rows. Each loop could be split into two smaller overlapped Rx loops during reception. Results Experimental data demonstrated that both SNR and parallel reception performance improved substantially by doubling the number of Rx elements from four to eight. Conclusion As a proof of concept, we developed and constructed a novel splittable transceiver phased array that allows doubling of the number of Rx elements while keeping both Tx and Rx elements at the same distance from the subject. Both Tx and Rx performance can be optimized at the same time using this method.

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 Dates: 2016-11
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/mrm.26051
BibTex Citekey: AvdievichGH2015_6
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Pages: - Volume / Issue: 76 (5) Sequence Number: - Start / End Page: 1621 - 1628 Identifier: -