Puddu, C., Rao, M. orcid.org/0000-0002-4109-4176, Xu, X. et al. (7 more authors) (2021) An asymmetrical whole-body birdcage RF coil without RF shield for hyperpolarized 129Xe lung MR imaging at 1.5 T. Magnetic Resonance in Medicine, 86 (6). pp. 3373-3381. ISSN 0740-3194
Abstract
Purpose
This study describes the development and testing of an asymmetrical xenon-129 (129Xe) birdcage radiofrequency (RF) coil for 129Xe lung ventilation imaging at 1.5 Tesla, which allows proton (1H) system body coil transmit–receive functionality.
Methods
The 129Xe RF coil is a whole-body asymmetrical elliptical birdcage constructed without an outer RF shield to enable 1H imaging. urn:x-wiley:07403194:media:mrm28915:mrm28915-math-0001 field homogeneity and flip angle mapping of the 129Xe birdcage RF coil and 1H system body RF coil with the 129Xe RF coil in situ were evaluated in the MR scanner. The functionality of the 129Xe birdcage RF coil was demonstrated through hyperpolarized 129Xe lung ventilation imaging with the birdcage in both transceiver configuration and transmit-only configuration when combined with an 8-channel 129Xe receive-only RF coil array. The functionality of 1H system body coil with the 129Xe RF coil in situ was demonstrated by acquiring coregistered 1H lung anatomical MR images.
Results
The asymmetrical birdcage produced a homogeneous urn:x-wiley:07403194:media:mrm28915:mrm28915-math-0002 field (±10%) in agreement with electromagnetic simulations. Simulations indicated an optimal detuning configuration with 4 diodes. The obtained g-factor of 1.4 for acceleration factor of R = 2 indicates optimal array configuration. Coregistered 1H anatomical images from the system body coil along with 129Xe lung images demonstrated concurrent and compatible arrangement of the RF coils.
Conclusion
A large asymmetrical birdcage for homogenous urn:x-wiley:07403194:media:mrm28915:mrm28915-math-0003 transmission with high sensitivity reception for 129Xe lung MRI at 1.5 Tesla has been demonstrated. The unshielded asymmetrical birdcage design enables 1H structural lung MR imaging in the same exam.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 The Authors. Magnetic Resonance in Medicine published by Wiley Periodicals LLC on behalf of International Society for Magnetic Resonance in Medicine. This is an open access article under the terms of the Creative Commons Attribution License, (http://creativecommons.org/licenses/by/4.0/) which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | Asymmetrical elliptical birdcage coil; hyperpolarized xenon-129; Lung RF coils |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Sheffield Teaching Hospitals |
Funding Information: | Funder Grant number MEDICAL RESEARCH COUNCIL MR/M008894/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 03 Sep 2021 15:42 |
Last Modified: | 09 Mar 2022 10:04 |
Status: | Published |
Publisher: | Wiley |
Refereed: | Yes |
Identification Number: | 10.1002/mrm.28915 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:177822 |