A shielded 32‐channel body transceiver array with integrated electronics for 7 T.
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| Title: | A shielded 32‐channel body transceiver array with integrated electronics for 7 T. |
|---|---|
| Authors: | Haluptzok, Tobey D.1 (AUTHOR) halup011@umn.edu, Lagore, Russell L.1 (AUTHOR), Schmidt, Simon1 (AUTHOR), Metzger, Gregory J.1 (AUTHOR) |
| Source: | Magnetic Resonance in Medicine. Aug2025, Vol. 94 Issue 2, p852-866. 15p. |
| Subjects: | Magnetic resonance imaging, Target acquisition, Pelvis, Abdomen, Angles |
| Abstract: | Purpose: Develop a 32‐channel transceiver array for 7 T body imaging that incorporates an RF shield, improves SNR, lowers g‐factors, and is robust to external loading. Methods: The addition of a local RF shield was first investigated for single resonant blocks consisting of either one loop and a dipole (LD) or three loops and a dipole (3LD). A 32‐channel array consisting of eight shielded 3LD blocks (32LD‐SH) was constructed and validated for in‐vivo use. The SNR, parallel imaging, and transmit performance were compared to a previously published 16‐channel LD array (16LD). The effect of top loading was investigated by placing arms on top of the coils and measuring S‐parameter changes. In vivo imaging of multiple anatomies was performed. Results: In single block experiments, the RF shield impacted SNR and B1+$$ {\mathrm{B}}_1^{+} $$ performance by <5%. The 3LD blocks had 80% higher peripheral SNR and 25% higher SNR at a depth of 10 cm. The 32LD‐SH array had 18% lower B1+$$ {B}_1^{+} $$/W0.5 efficiency and 30% higher central SNR compared to the 16LD array and supported threefold acceleration in the foot–head direction. Arm placement had no effect on the 32LD‐SH array but reduced the 16LD match to 5.4 dB. Conclusion: A 32‐channel transceiver array was developed for 7 T body imaging that is insensitive to top loading and has higher SNR and lower g‐factors compared to an existing 16‐channel transceiver array. Despite lower transmit performance, parallel transmit optimization permitted the 32LD‐SH to achieve flip angles necessary for high‐quality gradient and spin echo acquisitions of target organs in the chest, abdomen, and pelvis. [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.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 185726155 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: A shielded 32‐channel body transceiver array with integrated electronics for 7 T. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Haluptzok%2C+Tobey+D%2E%22">Haluptzok, Tobey D.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> halup011@umn.edu</i><br /><searchLink fieldCode="AR" term="%22Lagore%2C+Russell+L%2E%22">Lagore, Russell L.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Schmidt%2C+Simon%22">Schmidt, Simon</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Metzger%2C+Gregory+J%2E%22">Metzger, Gregory J.</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Magnetic+Resonance+in+Medicine%22">Magnetic Resonance in Medicine</searchLink>. Aug2025, Vol. 94 Issue 2, p852-866. 15p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Magnetic+resonance+imaging%22">Magnetic resonance imaging</searchLink><br /><searchLink fieldCode="DE" term="%22Target+acquisition%22">Target acquisition</searchLink><br /><searchLink fieldCode="DE" term="%22Pelvis%22">Pelvis</searchLink><br /><searchLink fieldCode="DE" term="%22Abdomen%22">Abdomen</searchLink><br /><searchLink fieldCode="DE" term="%22Angles%22">Angles</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Purpose: Develop a 32‐channel transceiver array for 7 T body imaging that incorporates an RF shield, improves SNR, lowers g‐factors, and is robust to external loading. Methods: The addition of a local RF shield was first investigated for single resonant blocks consisting of either one loop and a dipole (LD) or three loops and a dipole (3LD). A 32‐channel array consisting of eight shielded 3LD blocks (32LD‐SH) was constructed and validated for in‐vivo use. The SNR, parallel imaging, and transmit performance were compared to a previously published 16‐channel LD array (16LD). The effect of top loading was investigated by placing arms on top of the coils and measuring S‐parameter changes. In vivo imaging of multiple anatomies was performed. Results: In single block experiments, the RF shield impacted SNR and B1+$$ {\mathrm{B}}_1^{+} $$ performance by <5%. The 3LD blocks had 80% higher peripheral SNR and 25% higher SNR at a depth of 10 cm. The 32LD‐SH array had 18% lower B1+$$ {B}_1^{+} $$/W0.5 efficiency and 30% higher central SNR compared to the 16LD array and supported threefold acceleration in the foot–head direction. Arm placement had no effect on the 32LD‐SH array but reduced the 16LD match to 5.4 dB. Conclusion: A 32‐channel transceiver array was developed for 7 T body imaging that is insensitive to top loading and has higher SNR and lower g‐factors compared to an existing 16‐channel transceiver array. Despite lower transmit performance, parallel transmit optimization permitted the 32LD‐SH to achieve flip angles necessary for high‐quality gradient and spin echo acquisitions of target organs in the chest, abdomen, and pelvis. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab 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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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/mrm.30498 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 852 Subjects: – SubjectFull: Magnetic resonance imaging Type: general – SubjectFull: Target acquisition Type: general – SubjectFull: Pelvis Type: general – SubjectFull: Abdomen Type: general – SubjectFull: Angles Type: general Titles: – TitleFull: A shielded 32‐channel body transceiver array with integrated electronics for 7 T. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Haluptzok, Tobey D. – PersonEntity: Name: NameFull: Lagore, Russell L. – PersonEntity: Name: NameFull: Schmidt, Simon – PersonEntity: Name: NameFull: Metzger, Gregory J. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: Aug2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 07403194 Numbering: – Type: volume Value: 94 – Type: issue Value: 2 Titles: – TitleFull: Magnetic Resonance in Medicine Type: main |
| ResultId | 1 |
