Evaluation of a 16-channel transceiver loop c dipole antenna array for human head imaging at 10.5 tesla

Myung Kyun Woo, Lance Delabarre, Byeong Yeul Lee, Matt Waks, Russell Luke Lagore, Jerahmie William Radder, Yigitcan Eryaman, Kamil Ugurbil, Gregor Adriany

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We evaluated a 16-channel loop + dipole (LD) transceiver antenna array with improved specific absorption rate (SAR) efficiency for 10.5 Tesla (T) human head imaging apsplications. Three different array designs with equal inner dimensions were considered: An 8-channel dipole antenna, an 8-channel loop, and a 16-channel LD antenna arrays. Signal-to-noise ratio (SNR) and B1 + efficiency (in units of μT per √W) were simulated and measured in 10.5 T magnetic resonance imaging (MRI) experiments. For the safety validation, 10 g SAR and SAR efficiency (defined as the B1 + over √ (peak 10 g SAR)) were calculated through simulation. Finally, high resolution porcine brain images were acquired with the 16-channel LD antenna array, including a fast turbo-spin echo (TSE) sequence incorporating B1 shimming techniques. Both the simulation and experiments demonstrated that the combined 16-channel LD antenna array showed similar B1 + efficiency compared to the 8-channel dipole antenna and the 8-channel loop arrays in a circular polarized (CP) mode. In a central 2 mm × 2 mm region of the phantom, however, the 16-channel LD antenna array showed an improvement in peak 10 g SAR of 27.5 % and 32.5 % over the 8-channel dipole antenna and the 8-channel loop arrays, respectively. We conclude that the proposed 16-channel head LD antenna array design is capable of achieving ~7% higher SAR efficiency at 10.5 T compared to either the 8-channel loop-only or the 8-channel dipole-only antenna arrays of the same dimensions.

Original languageEnglish (US)
Pages (from-to)203555-203563
Number of pages9
JournalIEEE Access
StatePublished - 2020

Bibliographical note

Funding Information:
This work was supported in part by the U.S. Department of National Institutes of Health under Grant U01-EB025144, Grant S10-RR029672, Grant P41-EB015894, Grant P41-EB027061, and Grant P30-NS076408.

Publisher Copyright:
© 2020 Institute of Electrical and Electronics Engineers Inc.. All rights reserved.


  • Dipole antenna array
  • Human head array
  • Loop array
  • Magnetic resonance imaging
  • Rf coil
  • Ultra-high field


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