RF shimming in the cervical spinal cord at 7 T.
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| Title: | RF shimming in the cervical spinal cord at 7 T. |
|---|---|
| Authors: | Papp, Daniel1 (AUTHOR), Gilbert, Kyle M.2,3 (AUTHOR), Cereza, Gaspard1 (AUTHOR), D'Astous, Alexandre1,4 (AUTHOR), Lopez‐Rios, Nibardo1 (AUTHOR), Boudreau, Mathieu1 (AUTHOR), Couch, Marcus J.5,6 (AUTHOR), Yazdanbakhsh, Pedram6 (AUTHOR), Barry, Robert L.7,8,9 (AUTHOR), Alonso‐Ortiz, Eva1 (AUTHOR), Cohen‐Adad, Julien1,4,10,11 (AUTHOR) jcohen@polymtl.ca |
| Source: | Magnetic Resonance in Medicine. Dec2024, Vol. 92 Issue 6, p2392-2403. 12p. |
| Subjects: | Cervical cord, Central nervous system, Spinal cord, Imaging systems, Neurodegeneration |
| Abstract: | Purpose: Advancing the development of 7 T MRI for spinal cord imaging is crucial for the enhanced diagnosis and monitoring of various neurodegenerative diseases and traumas. However, a significant challenge at this field strength is the transmit field inhomogeneity. Such inhomogeneity is particularly problematic for imaging the small, deep anatomical structures of the cervical spinal cord, as it can cause uneven signal intensity and elevate the local specific absorption ratio, compromising image quality. This multisite study explores several RF shimming techniques in the cervical spinal cord. Methods: Data were collected from 5 participants between two 7 T sites with a custom 8Tx/20Rx parallel transmission coil. We explored two radiofrequency (RF) shimming approaches from an MRI vendor and four from an open‐source toolbox, showcasing their ability to enhance transmit field and signal homogeneity along the cervical spinal cord. Results: The circularly polarized (CP), coefficient of variation (CoV), and specific absorption rate (SAR) efficiency shim modes showed the highest B1+ efficiency, and the vendor‐based "patient" and "volume" modes showed the lowest B1+ efficiency. The coefficient of variation method produced the highest CSF/spinal cord contrast on T2*‐weighted scans (ratio of 1.27 ± 0.03), and the lowest variation of that contrast along the superior–inferior axis. Conclusion: The study's findings highlight the potential of RF shimming to advance 7 T MRI's clinical utility for central nervous system imaging by enabling more homogenous and efficient spinal cord imaging. Additionally, the research incorporates a reproducible Jupyter Notebook, enhancing the study's transparency and facilitating peer verification. [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: 179962632 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: RF shimming in the cervical spinal cord at 7 T. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Papp%2C+Daniel%22">Papp, Daniel</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gilbert%2C+Kyle+M%2E%22">Gilbert, Kyle M.</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cereza%2C+Gaspard%22">Cereza, Gaspard</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22D'Astous%2C+Alexandre%22">D'Astous, Alexandre</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lopez‐Rios%2C+Nibardo%22">Lopez‐Rios, Nibardo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Boudreau%2C+Mathieu%22">Boudreau, Mathieu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Couch%2C+Marcus+J%2E%22">Couch, Marcus J.</searchLink><relatesTo>5,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yazdanbakhsh%2C+Pedram%22">Yazdanbakhsh, Pedram</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Barry%2C+Robert+L%2E%22">Barry, Robert L.</searchLink><relatesTo>7,8,9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alonso‐Ortiz%2C+Eva%22">Alonso‐Ortiz, Eva</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cohen‐Adad%2C+Julien%22">Cohen‐Adad, Julien</searchLink><relatesTo>1,4,10,11</relatesTo> (AUTHOR)<i> jcohen@polymtl.ca</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Magnetic+Resonance+in+Medicine%22">Magnetic Resonance in Medicine</searchLink>. Dec2024, Vol. 92 Issue 6, p2392-2403. 12p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Cervical+cord%22">Cervical cord</searchLink><br /><searchLink fieldCode="DE" term="%22Central+nervous+system%22">Central nervous system</searchLink><br /><searchLink fieldCode="DE" term="%22Spinal+cord%22">Spinal cord</searchLink><br /><searchLink fieldCode="DE" term="%22Imaging+systems%22">Imaging systems</searchLink><br /><searchLink fieldCode="DE" term="%22Neurodegeneration%22">Neurodegeneration</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Purpose: Advancing the development of 7 T MRI for spinal cord imaging is crucial for the enhanced diagnosis and monitoring of various neurodegenerative diseases and traumas. However, a significant challenge at this field strength is the transmit field inhomogeneity. Such inhomogeneity is particularly problematic for imaging the small, deep anatomical structures of the cervical spinal cord, as it can cause uneven signal intensity and elevate the local specific absorption ratio, compromising image quality. This multisite study explores several RF shimming techniques in the cervical spinal cord. Methods: Data were collected from 5 participants between two 7 T sites with a custom 8Tx/20Rx parallel transmission coil. We explored two radiofrequency (RF) shimming approaches from an MRI vendor and four from an open‐source toolbox, showcasing their ability to enhance transmit field and signal homogeneity along the cervical spinal cord. Results: The circularly polarized (CP), coefficient of variation (CoV), and specific absorption rate (SAR) efficiency shim modes showed the highest B1+ efficiency, and the vendor‐based "patient" and "volume" modes showed the lowest B1+ efficiency. The coefficient of variation method produced the highest CSF/spinal cord contrast on T2*‐weighted scans (ratio of 1.27 ± 0.03), and the lowest variation of that contrast along the superior–inferior axis. Conclusion: The study's findings highlight the potential of RF shimming to advance 7 T MRI's clinical utility for central nervous system imaging by enabling more homogenous and efficient spinal cord imaging. Additionally, the research incorporates a reproducible Jupyter Notebook, enhancing the study's transparency and facilitating peer verification. [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.30225 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 12 StartPage: 2392 Subjects: – SubjectFull: Cervical cord Type: general – SubjectFull: Central nervous system Type: general – SubjectFull: Spinal cord Type: general – SubjectFull: Imaging systems Type: general – SubjectFull: Neurodegeneration Type: general Titles: – TitleFull: RF shimming in the cervical spinal cord at 7 T. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Papp, Daniel – PersonEntity: Name: NameFull: Gilbert, Kyle M. – PersonEntity: Name: NameFull: Cereza, Gaspard – PersonEntity: Name: NameFull: D'Astous, Alexandre – PersonEntity: Name: NameFull: Lopez‐Rios, Nibardo – PersonEntity: Name: NameFull: Boudreau, Mathieu – PersonEntity: Name: NameFull: Couch, Marcus J. – PersonEntity: Name: NameFull: Yazdanbakhsh, Pedram – PersonEntity: Name: NameFull: Barry, Robert L. – PersonEntity: Name: NameFull: Alonso‐Ortiz, Eva – PersonEntity: Name: NameFull: Cohen‐Adad, Julien IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 07403194 Numbering: – Type: volume Value: 92 – Type: issue Value: 6 Titles: – TitleFull: Magnetic Resonance in Medicine Type: main |
| ResultId | 1 |
