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  Numerical and Experimental Evaluation of Short Folded Recieve-Only Dipoles for 9.4T Human Head Arrays

Solomakha, G., Glybovski, S., Melchakova, I., Henning, A., Scheffler, K., & Avdievich, N. (2019). Numerical and Experimental Evaluation of Short Folded Recieve-Only Dipoles for 9.4T Human Head Arrays. In 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA) (pp. 0489-0491). Piscataway, NJ, USA: IEEE. doi:10.1109/ICEAA.2019.8879340.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0004-940B-9 Version Permalink: https://hdl.handle.net/21.11116/0000-0007-49AB-7
Genre: Conference Paper

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https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8879340 (Publisher version)
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 Creators:
Solomakha, G, Author           
Glybovski, S, Author
Melchakova, I, Author
Henning, A1, 2, Author           
Scheffler, K2, 3, Author           
Avdievich, N1, 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, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              
3Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              

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 Abstract: Improvement of signal-to-noise ratio (SNR) is a critical step in designing any MRI radio frequency (RF) coil. Increasing the number of surface loops in a human head receive (Rx) array improves the peripheral SNR, while the central SNR doesnt substantially change. Recent studies demonstrated that an optimal central SNR at UHF frequencies (298 MHz and higher) requires contribution of two current patterns associated with loops and dipoles. To incorporate multiple dipoles into a human head loop Rx-array, the dipole length has to be substantially reduced, which compromises its performance. Another issue of using short Rx-dipoles is a sensitivity of their resonance frequency to loading due to a large electrical field near the dipole. To reduce the sensitivity, we propose to fold dipoles towards the RF-shield. A novel array consisting of 8 transceiver surface loops and 8 folded Rx-dipoles was developed and tested. Addition of Rx-dipoles doesnt substantially change the $B_{1}^{+}$ field and the maximum local SAR of the array. At the same time, the new design improves both the central and peripheral SNR as compared 16-element array with Rx-only vertical loops and 8-element transceiver surface loop array.

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 Dates: 2019-092019-10
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1109/ICEAA.2019.8879340
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Title: Twenty-first International Conference on Electromagnetics in Advanced Applications (ICEAA 2019), Ninth IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC 2019)
Place of Event: Granada, Spain
Start-/End Date: 2019-09-09 - 2019-09-13

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Title: 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)
Source Genre: Proceedings
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Publ. Info: Piscataway, NJ, USA : IEEE
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 0489 - 0491 Identifier: ISBN: 978-1-7281-0563-5