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  Decoupling of a tight-fit transceiver phased array for human brain imaging at 9.4T: Loop overlapping rediscovered

Avdievich, N., Giapitzakis, I.-A., Pfrommer, A., & Henning, A. (2018). Decoupling of a tight-fit transceiver phased array for human brain imaging at 9.4T: Loop overlapping rediscovered. Magnetic Resonance in Medicine, 79(2), 1200-1211. doi:10.1002/mrm.26754.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-7D0A-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-7D0B-8
Genre: Journal Article

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Avdievich, NI1, 2, 3, Author              
Giapitzakis, I-A1, 2, 3, Author              
Pfrommer, A1, 3, Author              
Henning, A1, 2, 3, Author              
Affiliations:
1Research Group MR Spectroscopy and Ultra-High Field Methodology, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_2528692              
2Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              
3Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: Purpose To improve the decoupling of a transceiver human head phased array at ultra-high fields (UHF, ≥ 7T) and to optimize its transmit (Tx) and receive (Rx) performance, a single-row eight-element (1 × 8) tight-fit transceiver overlapped loop array was developed and constructed. Overlapping the loops increases the RF field penetration depth but can compromise decoupling by generating substantial mutual resistance. Methods Based on analytical modeling, we optimized the loop geometry and relative positioning to simultaneously minimize the resistive and inductive coupling and constructed a 9.4T eight-loop transceiver head phased array decoupled entirely by overlapping loops. Results We demonstrated that both the magnetic and electric coupling between adjacent loops is compensated at the same time by overlapping and nearly perfect decoupling (below -30 dB) can be obtained without additional decoupling strategies. Tx-efficiency and SNR of the overlapped array outperformed that of a common UHF gapped array of similar dimensions. Parallel Rx-performance was also not compromised due to overlapping the loops. Conclusion As a proof of concept we developed and constructed a 9.4T (400 MHz) overlapped transceiver head array based on results of the analytical modeling. We demonstrated that at UHF overlapping loops not only provides excellent decoupling but also improves both Tx- and Rx-performance.

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 Dates: 2018-02
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/mrm.26754
BibTex Citekey: AvdievichGPH2017
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Pages: - Volume / Issue: 79 (2) Sequence Number: - Start / End Page: 1200 - 1211 Identifier: -