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  Effect of Mismatching on the Transmit and Receive Performance of a Human Head 9.4T Tight-Fit Transceiver Phased Array

Avdievich, N., Giapitzakis, I., & Henning, A. (2017). Effect of Mismatching on the Transmit and Receive Performance of a Human Head 9.4T Tight-Fit Transceiver Phased Array. Poster presented at 25th Annual Meeting and Exhibition of the International Society for Magnetic Resonance in Medicine (ISMRM 2017), Honolulu, HI, USA.

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Avdievich, N1, 2, Author              
Giapitzakis, I1, 2, Author              
Henning, A1, 2, Author              
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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: Tight-fit multi-channel ultra-high field (UHF, >7T) transceiver (TxRx) phased arrays improve transmit (Tx) efficiency in comparison to larger Tx-only arrays. However, tight-fit TxRx-arrays may require matching for each subject. To evaluate a potential use of tight-fit TxRx-arrays without matching, we investigated both numerically and experimentally an effect of a strong mismatch on performance of a 9.4T 8-channel human head TxRx-array. We demonstrated that mismatching caused only ~5 decrease of the B1+ field, while may have stronger effect on the maximum local SAR. Additionally it also effects the SNR distribution. While overmatching favors SNR, undermatching may enhance Tx-efficiency evaluated as B1+/√SAR10g.

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 Dates: 2017-04-25
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: AvdievichGH2017_2
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Title: 25th Annual Meeting and Exhibition of the International Society for Magnetic Resonance in Medicine (ISMRM 2017)
Place of Event: Honolulu, HI, USA
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Title: 25th Annual Meeting and Exhibition of the International Society for Magnetic Resonance in Medicine (ISMRM 2017)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 4301 Start / End Page: - Identifier: -