Wideband receive‐coil array design using high‐impedance amplifiers for broadband decoupling.
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| Title: | Wideband receive‐coil array design using high‐impedance amplifiers for broadband decoupling. |
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| Authors: | Sun, Chenhao1,2 (AUTHOR), Bauer, Courtney C.1 (AUTHOR), Hou, Jue1 (AUTHOR), Wright, Steven M.1,3 (AUTHOR) smwright@tamu.edu |
| Source: | Magnetic Resonance in Medicine. Nov2023, Vol. 90 Issue 5, p2198-2210. 13p. |
| Subjects: | Broadband amplifiers, Preamplifiers, Tissue arrays |
| Abstract: | Purpose: Multinuclear MRI/S is of increasing interest. Currently, most multinuclear receive array coils are constructed by nesting multiple single‐tuned array coils or using switching elements to control the operating frequency, in which case more than one set of conventional isolation preamplifiers and associated decoupling circuits is required. These conventional configurations rapidly become complicated when greater numbers of channels or nuclei are needed. In this work, a novel coil decoupling mechanism is proposed to enable broadband decoupling for array coils with one set of preamplifiers. Methods: Instead of using conventional isolation preamplifiers, a high‐input impedance preamplifier is proposed to create broadband decoupling of the array elements. A matching network consisting of a single inductor‐capacitor‐capacitor multi‐tuned network and a wire‐wound transformer was used to interface the surface coil to the high‐impedance preamplifier. To validate the concept, the proposed configuration was compared to the conventional preamplifier decoupling configuration on both bench and scanner. Results: 2 The approach can provide more than 15dB decoupling over a range of 25MHz, covering the Larmor frequencies of 23Na and 2H at 4.7T. This multi–tuned prototype obtained 61% and 76% of the imaging SNR at 2H and 23Na respectively, 76 and 89% in a higher loading test phantom, when compared to the conventional single–tuned preamplifier decoupling configuration. Conclusion: With the multinuclear array operation and decoupling achieved using only one layer of array coil and preamplifiers, this work provides a simple approach of building high element‐count arrays to enable accelerated imaging or SNR improvement from multiple nuclei. [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: 171106048 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Wideband receive‐coil array design using high‐impedance amplifiers for broadband decoupling. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Sun%2C+Chenhao%22">Sun, Chenhao</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bauer%2C+Courtney+C%2E%22">Bauer, Courtney C.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hou%2C+Jue%22">Hou, Jue</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wright%2C+Steven+M%2E%22">Wright, Steven M.</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<i> smwright@tamu.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Magnetic+Resonance+in+Medicine%22">Magnetic Resonance in Medicine</searchLink>. Nov2023, Vol. 90 Issue 5, p2198-2210. 13p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Broadband+amplifiers%22">Broadband amplifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Preamplifiers%22">Preamplifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Tissue+arrays%22">Tissue arrays</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Purpose: Multinuclear MRI/S is of increasing interest. Currently, most multinuclear receive array coils are constructed by nesting multiple single‐tuned array coils or using switching elements to control the operating frequency, in which case more than one set of conventional isolation preamplifiers and associated decoupling circuits is required. These conventional configurations rapidly become complicated when greater numbers of channels or nuclei are needed. In this work, a novel coil decoupling mechanism is proposed to enable broadband decoupling for array coils with one set of preamplifiers. Methods: Instead of using conventional isolation preamplifiers, a high‐input impedance preamplifier is proposed to create broadband decoupling of the array elements. A matching network consisting of a single inductor‐capacitor‐capacitor multi‐tuned network and a wire‐wound transformer was used to interface the surface coil to the high‐impedance preamplifier. To validate the concept, the proposed configuration was compared to the conventional preamplifier decoupling configuration on both bench and scanner. Results: 2 The approach can provide more than 15dB decoupling over a range of 25MHz, covering the Larmor frequencies of 23Na and 2H at 4.7T. This multi–tuned prototype obtained 61% and 76% of the imaging SNR at 2H and 23Na respectively, 76 and 89% in a higher loading test phantom, when compared to the conventional single–tuned preamplifier decoupling configuration. Conclusion: With the multinuclear array operation and decoupling achieved using only one layer of array coil and preamplifiers, this work provides a simple approach of building high element‐count arrays to enable accelerated imaging or SNR improvement from multiple nuclei. [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.29755 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 2198 Subjects: – SubjectFull: Broadband amplifiers Type: general – SubjectFull: Preamplifiers Type: general – SubjectFull: Tissue arrays Type: general Titles: – TitleFull: Wideband receive‐coil array design using high‐impedance amplifiers for broadband decoupling. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Sun, Chenhao – PersonEntity: Name: NameFull: Bauer, Courtney C. – PersonEntity: Name: NameFull: Hou, Jue – PersonEntity: Name: NameFull: Wright, Steven M. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: Nov2023 Type: published Y: 2023 Identifiers: – Type: issn-print Value: 07403194 Numbering: – Type: volume Value: 90 – Type: issue Value: 5 Titles: – TitleFull: Magnetic Resonance in Medicine Type: main |
| ResultId | 1 |
