Electromagnetic and RF pulse design simulation based optimization of an eight‐channel loop array for 11.7T brain imaging
Article Swipe
Son Chu
,
Vincent Gras
,
Franck Mauconduit
,
Aurélien Massire
,
Nicolas Boulant
,
G Shajan
·
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1002/mrm.29654
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1002/mrm.29654
Purpose Optimization of transmit array performance is crucial in ultra‐high‐field MRI scanners such as 11.7T because of the increased RF losses and RF nonuniformity. This work presents a new workflow to investigate and minimize RF coil losses, and to choose the optimum coil configuration for imaging. Methods An 8‐channel transceiver loop‐array was simulated to analyze its loss mechanism at 499.415 MHz. A folded‐end RF shield was developed to limit radiation loss and improve the efficiency. The coil element length, and the shield diameter and length were further optimized using electromagnetic (EM) simulations. The generated EM fields were used to perform RF pulse design (RFPD) simulations under realistic constraints. The chosen coil design was constructed to demonstrate performance equivalence in bench and scanner measurements. Results The use of conventional RF shields at 11.7T resulted in significantly high radiation losses of 18.4%. Folding the ends of the RF shield combined with optimizing the shield diameter and length increased the absorbed power in biological tissue and reduced the radiation loss to 2.4%. The peak of the optimal array was 42% more than the reference array. Phantom measurements validated the numerical simulations with a close match of within 4% of the predicted . Conclusion A workflow that combines EM and RFPD simulations to numerically optimize transmit arrays was developed. Results have been validated using phantom measurements. Our findings demonstrate the need for optimizing the RF shield in conjunction with array element design to achieve efficient excitation at 11.7T.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1002/mrm.29654
- https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/mrm.29654
- OA Status
- hybrid
- Cited By
- 10
- References
- 43
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4362458762
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Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4362458762Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1002/mrm.29654Digital Object Identifier
- Title
-
Electromagnetic and
RF pulse design simulation based optimization of an eight‐channel loop array for 11.7T brain imagingWork title - Type
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articleOpenAlex work type
- Language
-
enPrimary language
- Publication year
-
2023Year of publication
- Publication date
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2023-03-31Full publication date if available
- Authors
-
Son Chu, Vincent Gras, Franck Mauconduit, Aurélien Massire, Nicolas Boulant, G ShajanList of authors in order
- Landing page
-
https://doi.org/10.1002/mrm.29654Publisher landing page
- PDF URL
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https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/mrm.29654Direct link to full text PDF
- Open access
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YesWhether a free full text is available
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-
hybridOpen access status per OpenAlex
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https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/mrm.29654Direct OA link when available
- Concepts
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Radiofrequency coil, Electromagnetic coil, Imaging phantom, Radio frequency, Shields, Scanner, Shield, Acoustics, Electromagnetic shielding, Computer science, RF power amplifier, Physics, Materials science, Optics, Telecommunications, Quantum mechanics, Petrology, Geology, Bandwidth (computing), AmplifierTop concepts (fields/topics) attached by OpenAlex
- Cited by
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10Total citation count in OpenAlex
- Citations by year (recent)
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2025: 4, 2024: 5, 2023: 1Per-year citation counts (last 5 years)
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43Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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