English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Evaluation of short folded dipole antennas as receive elements of ultra‐high‐field human head array

Avdievich, N., Solomakha, G., Ruhm, L., Scheffler, K., & Henning, A. (2019). Evaluation of short folded dipole antennas as receive elements of ultra‐high‐field human head array. Magnetic Resonance in Medicine, 82(2), 811-824. doi:10.1002/mrm.27754.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0003-5CFC-B Version Permalink: http://hdl.handle.net/21.11116/0000-0003-961B-6
Genre: Journal Article

Files

show Files

Locators

show
hide
Description:
-

Creators

show
hide
 Creators:
Avdievich, NI1, 2, Author              
Solomakha, G, Author
Ruhm, L2, 3, Author              
Scheffler, K1, 2, Author              
Henning, A2, 3, Author              
Affiliations:
1Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              
3Research Group MR Spectroscopy and Ultra-High Field Methodology, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_2528692              

Content

show
hide
Free keywords: -
 Abstract: Purpose: To improve the receive (Rx) performance of a human head transceiver (TxRx) array at 9.4T without compromising its transmit (Tx) performance, a novel 16‐element array was developed, constructed, and tested. Methods: We designed and constructed a phased array, which consists of 8 TxRx surface loops placed in a single row and circumscribing a head, and 8 Rx‐only short folded dipole antennas. Dipoles were positioned along the central axis of each transceiver loop perpendicular to its surface. We evaluated the effect of Rx dipoles on the Tx efficiency of the array and maximum local specific absorption rate (SAR) as compared to the array of 8 surface loops only. We also compared the new array to a 16‐channel array of the same size consisting of 8 TxRx surface loops and 8 Rx‐only vertical loops in terms of Tx efficiency, SAR, and signal‐to‐noise ratio (SNR). Results: The new array improves both peripheral (up to 2 times) and central (1.17 times) SNR as compared to the 16‐element array of the same geometry consisting of 8 TxRx surface loops and 8 Rx‐only vertical loops. We demonstrated that an addition of actively detuned Rx‐only dipole elements produces only a small decrease (~7%) of the equation/mrm27754-math-0001.png transmit field and a small increase (<7%) of the maximum local SAR. Conclusion: As a proof of concept, we developed and constructed a prototype of a 9.4T (400 MHz) head array consisting of 8 TxRx surface loops and 8 Rx‐only short optimized folded dipoles. We demonstrated that at ultra‐high field, dipoles outperformed Rx‐only vertical loops in vivo.

Details

show
hide
Language(s):
 Dates: 2019-042019-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1002/mrm.27754
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Magnetic Resonance in Medicine
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: New York : Wiley-Liss
Pages: - Volume / Issue: 82 (2) Sequence Number: - Start / End Page: 811 - 824 Identifier: ISSN: 0740-3194
CoNE: https://pure.mpg.de/cone/journals/resource/954925538149