Introduction of the snake antenna array : Geometry optimization of a sinusoidal dipole antenna for 10.5T body imaging with lower peak SAR
© 2020 The Authors. Magnetic Resonance in Medicine published by Wiley Periodicals LLC on behalf of International Society for Magnetic Resonance in Medicine..
PURPOSE: To improve imaging performance for body MRI with a local transmit array at 10.5T, the geometry of a dipole antenna was optimized to achieve lower peak specific absorption rate (SAR) levels and a more uniform transmit profile.
METHODS: Electromagnetic simulations on a phantom were used to evaluate the SAR and B 1 + -performance of different dipole antenna geometries. The best performing antenna (the snake antenna) was simulated on human models in a 12-channel array configuration for safety assessment and for comparison to a previous antenna design. This 12-channel array was constructed after which electromagnetic simulations were validated by B 1 + -maps and temperature measurements. After obtaining approval by the Food and Drug Administration to scan with the snake antenna array, in vivo imaging was performed on 2 volunteers.
RESULTS: Simulation results on a phantom indicate a lower SAR and a higher transmit efficiency for the snake antenna compared to the fractionated dipole array. Similar results are found on a human body model: when comparing the trade-off between uniformity and peak SAR, the snake antenna performs better for all imaging targets. Simulations and measurements are in good agreement. Preliminary imaging result were acquired in 2 volunteers with the 12-channel snake antenna array.
CONCLUSION: By optimizing the geometry of a dipole antenna, peak SAR levels were lowered while achieving a more uniform transmit field as demonstrated in simulations on a phantom and a human body model. The array was constructed, validated, and successfully used to image 2 individuals at 10.5T.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2020 |
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| Erschienen: |
2020 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:84 |
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| Enthalten in: |
Magnetic resonance in medicine - 84(2020), 5 vom: 10. Nov., Seite 2885-2896 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Steensma, Bart [VerfasserIn] |
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| Links: |
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| Themen: |
Journal Article |
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| Anmerkungen: |
Date Completed 14.05.2021 Date Revised 14.05.2021 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1002/mrm.28297 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM309510988 |
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| 100 | 1 | |a Steensma, Bart |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Introduction of the snake antenna array |b Geometry optimization of a sinusoidal dipole antenna for 10.5T body imaging with lower peak SAR |
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| 500 | |a Date Completed 14.05.2021 | ||
| 500 | |a Date Revised 14.05.2021 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a © 2020 The Authors. Magnetic Resonance in Medicine published by Wiley Periodicals LLC on behalf of International Society for Magnetic Resonance in Medicine. | ||
| 520 | |a PURPOSE: To improve imaging performance for body MRI with a local transmit array at 10.5T, the geometry of a dipole antenna was optimized to achieve lower peak specific absorption rate (SAR) levels and a more uniform transmit profile | ||
| 520 | |a METHODS: Electromagnetic simulations on a phantom were used to evaluate the SAR and B 1 + -performance of different dipole antenna geometries. The best performing antenna (the snake antenna) was simulated on human models in a 12-channel array configuration for safety assessment and for comparison to a previous antenna design. This 12-channel array was constructed after which electromagnetic simulations were validated by B 1 + -maps and temperature measurements. After obtaining approval by the Food and Drug Administration to scan with the snake antenna array, in vivo imaging was performed on 2 volunteers | ||
| 520 | |a RESULTS: Simulation results on a phantom indicate a lower SAR and a higher transmit efficiency for the snake antenna compared to the fractionated dipole array. Similar results are found on a human body model: when comparing the trade-off between uniformity and peak SAR, the snake antenna performs better for all imaging targets. Simulations and measurements are in good agreement. Preliminary imaging result were acquired in 2 volunteers with the 12-channel snake antenna array | ||
| 520 | |a CONCLUSION: By optimizing the geometry of a dipole antenna, peak SAR levels were lowered while achieving a more uniform transmit field as demonstrated in simulations on a phantom and a human body model. The array was constructed, validated, and successfully used to image 2 individuals at 10.5T | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, N.I.H., Extramural | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 700 | 1 | |a van de Moortele, Pierre-Francois |e verfasserin |4 aut | |
| 700 | 1 | |a Ertürk, Arcan |e verfasserin |4 aut | |
| 700 | 1 | |a Grant, Andrea |e verfasserin |4 aut | |
| 700 | 1 | |a Adriany, Gregor |e verfasserin |4 aut | |
| 700 | 1 | |a Luijten, Peter |e verfasserin |4 aut | |
| 700 | 1 | |a Klomp, Dennis |e verfasserin |4 aut | |
| 700 | 1 | |a van den Berg, Nico |e verfasserin |4 aut | |
| 700 | 1 | |a Metzger, Gregory |e verfasserin |4 aut | |
| 700 | 1 | |a Raaijmakers, Alexander |e verfasserin |4 aut | |
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