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A 32‐channel high‐impedance honeycomb‐shaped receive array for temporal lobes exploration at 11.7T.

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Title: A 32‐channel high‐impedance honeycomb‐shaped receive array for temporal lobes exploration at 11.7T.
Authors: Gapais, Paul‐François1,2 (AUTHOR), Luong, Michel3 (AUTHOR), Giacomini, Eric1 (AUTHOR), Guillot, Jules1 (AUTHOR), Djaballah, Elias1 (AUTHOR), Gunamony, Shajan4 (AUTHOR), Chu, Son4 (AUTHOR), Hosseinnezhadian, Sajad2 (AUTHOR), Amadon, Alexis1 (AUTHOR) alexis.amadon@cea.fr
Source: Magnetic Resonance in Medicine. Jan2025, Vol. 93 Issue 1, p433-447. 15p.
Subjects: Modular design, Preamplifiers, Caps (Headgear), Artificial rubber, Honeycomb structures
Abstract: Purpose: The newly operational 11.7T Iseult scanner provides an improved global SNR in the human brain. This gain in SNR can be pushed even further locally by designing region‐focused dense receive arrays. The temporal lobes are particularly interesting to neuroscientists as they are associated with language and concept recognition. Our main goal was to maximize the SNR in the temporal lobes and provide high‐acceleration capabilities for fMRI studies. Methods: We designed and developed a 32‐channel receive array made of non‐overlapped hexagonal loops. The loops were arranged in a honeycomb pattern and targeted the temporal lobes. They were placed on a flexible neoprene cap closely fitting the head. A new stripline design with a high impedance was proposed and applied for the first time at 11.7T. Specific homebuilt miniaturized low‐impedance preamplifiers were directly mounted on the loops, providing preamplifier decoupling in a compact and modular design. Using an anatomical phantom, we experimentally compared the SNR and parallel imaging performance of the region‐focused cap to a 32‐channel whole‐brain receive array at 11.7T. Results: The experimental results showed a 1.7‐time higher SNR on average in the temporal lobes compared to the whole brain receive array. The g‐factor is also improved when undersampling in the antero‐posterior and head‐foot directions. Conclusion: A significant SNR boost in the temporal lobes was demonstrated at 11.7T compared to the whole‐brain receive array. The parallel imaging capabilities were also improved in the temporal lobes in some acceleration directions. [ABSTRACT FROM AUTHOR]
Copyright of Magnetic Resonance in Medicine is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: A 32‐channel high‐impedance honeycomb‐shaped receive array for temporal lobes exploration at 11.7T.
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  Data: <searchLink fieldCode="JN" term="%22Magnetic+Resonance+in+Medicine%22">Magnetic Resonance in Medicine</searchLink>. Jan2025, Vol. 93 Issue 1, p433-447. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Modular+design%22">Modular design</searchLink><br /><searchLink fieldCode="DE" term="%22Preamplifiers%22">Preamplifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Caps+%28Headgear%29%22">Caps (Headgear)</searchLink><br /><searchLink fieldCode="DE" term="%22Artificial+rubber%22">Artificial rubber</searchLink><br /><searchLink fieldCode="DE" term="%22Honeycomb+structures%22">Honeycomb structures</searchLink>
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  Label: Abstract
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  Data: Purpose: The newly operational 11.7T Iseult scanner provides an improved global SNR in the human brain. This gain in SNR can be pushed even further locally by designing region‐focused dense receive arrays. The temporal lobes are particularly interesting to neuroscientists as they are associated with language and concept recognition. Our main goal was to maximize the SNR in the temporal lobes and provide high‐acceleration capabilities for fMRI studies. Methods: We designed and developed a 32‐channel receive array made of non‐overlapped hexagonal loops. The loops were arranged in a honeycomb pattern and targeted the temporal lobes. They were placed on a flexible neoprene cap closely fitting the head. A new stripline design with a high impedance was proposed and applied for the first time at 11.7T. Specific homebuilt miniaturized low‐impedance preamplifiers were directly mounted on the loops, providing preamplifier decoupling in a compact and modular design. Using an anatomical phantom, we experimentally compared the SNR and parallel imaging performance of the region‐focused cap to a 32‐channel whole‐brain receive array at 11.7T. Results: The experimental results showed a 1.7‐time higher SNR on average in the temporal lobes compared to the whole brain receive array. The g‐factor is also improved when undersampling in the antero‐posterior and head‐foot directions. Conclusion: A significant SNR boost in the temporal lobes was demonstrated at 11.7T compared to the whole‐brain receive array. The parallel imaging capabilities were also improved in the temporal lobes in some acceleration directions. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Magnetic Resonance in Medicine is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/mrm.30274
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        Text: English
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        PageCount: 15
        StartPage: 433
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      – SubjectFull: Modular design
        Type: general
      – SubjectFull: Preamplifiers
        Type: general
      – SubjectFull: Caps (Headgear)
        Type: general
      – SubjectFull: Artificial rubber
        Type: general
      – SubjectFull: Honeycomb structures
        Type: general
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      – TitleFull: A 32‐channel high‐impedance honeycomb‐shaped receive array for temporal lobes exploration at 11.7T.
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            – D: 01
              M: 01
              Text: Jan2025
              Type: published
              Y: 2025
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