An improved homogeneity design method for fast field‐cycling coils in molecular MRI.
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| Title: | An improved homogeneity design method for fast field‐cycling coils in molecular MRI. |
|---|---|
| Authors: | McCready, Matthew A.1 (AUTHOR) mattmc@stanford.edu, Handler, William B.1 (AUTHOR), Chronik, Blaine A.1 (AUTHOR) |
| Source: | Magnetic Resonance in Medicine. Jun2022, Vol. 87 Issue 6, p3011-3021. 11p. |
| Subjects: | Boundary element methods, Homogeneity, Magnetic resonance imaging |
| Abstract: | Purpose: Delta relaxation‐enhanced MR (dreMR) is a field‐cycling quantitative method for molecular imaging. The dreMR method uses a B0 insert coil to shift the magnitude of the main magnetic field as a magnetization preparation phase of the pulse sequence. Here, an improved coil design method is presented that minimizes field inhomogeneities and allows for explicit control of the ROI. Methods: A solenoid produces the bulk field shift, and a boundary element method is employed to design in‐series shim and shield layers. A design is presented and compared to the current generation dreMR coil design on field inhomogeneity maps, shield performance, and simulated dreMR image. A proof‐of‐concept design is also presented with an ROI shifted from isocenter. Results: The new design is able to image a sphere of 8.5 cm in diameter with field inhomogeneity of < 1% versus the previous design's 5 cm. The new design presented an increase in shielding capabilities, whereas inductance and resistance increased. For a simulated dreMR image, the new design presented errors < 10% compared to an ideal field simulation, whereas the previous design had errors > 18%. The shifted ROI design produced a region of < 1% inhomogeneity much larger than a design with no shim layer. Conclusion: The new design method was found to greatly improve the insert coil field homogeneity and reduce errors in dreMR imaging in simulation without detriment to shielding. This method's capability to increase ROI and control its location will be used to design human dreMR coils going forward. [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: 155950708 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: An improved homogeneity design method for fast field‐cycling coils in molecular MRI. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22McCready%2C+Matthew+A%2E%22">McCready, Matthew A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mattmc@stanford.edu</i><br /><searchLink fieldCode="AR" term="%22Handler%2C+William+B%2E%22">Handler, William B.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chronik%2C+Blaine+A%2E%22">Chronik, Blaine A.</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>. Jun2022, Vol. 87 Issue 6, p3011-3021. 11p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Boundary+element+methods%22">Boundary element methods</searchLink><br /><searchLink fieldCode="DE" term="%22Homogeneity%22">Homogeneity</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+resonance+imaging%22">Magnetic resonance imaging</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Purpose: Delta relaxation‐enhanced MR (dreMR) is a field‐cycling quantitative method for molecular imaging. The dreMR method uses a B0 insert coil to shift the magnitude of the main magnetic field as a magnetization preparation phase of the pulse sequence. Here, an improved coil design method is presented that minimizes field inhomogeneities and allows for explicit control of the ROI. Methods: A solenoid produces the bulk field shift, and a boundary element method is employed to design in‐series shim and shield layers. A design is presented and compared to the current generation dreMR coil design on field inhomogeneity maps, shield performance, and simulated dreMR image. A proof‐of‐concept design is also presented with an ROI shifted from isocenter. Results: The new design is able to image a sphere of 8.5 cm in diameter with field inhomogeneity of < 1% versus the previous design's 5 cm. The new design presented an increase in shielding capabilities, whereas inductance and resistance increased. For a simulated dreMR image, the new design presented errors < 10% compared to an ideal field simulation, whereas the previous design had errors > 18%. The shifted ROI design produced a region of < 1% inhomogeneity much larger than a design with no shim layer. Conclusion: The new design method was found to greatly improve the insert coil field homogeneity and reduce errors in dreMR imaging in simulation without detriment to shielding. This method's capability to increase ROI and control its location will be used to design human dreMR coils going forward. [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.29178 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 3011 Subjects: – SubjectFull: Boundary element methods Type: general – SubjectFull: Homogeneity Type: general – SubjectFull: Magnetic resonance imaging Type: general Titles: – TitleFull: An improved homogeneity design method for fast field‐cycling coils in molecular MRI. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: McCready, Matthew A. – PersonEntity: Name: NameFull: Handler, William B. – PersonEntity: Name: NameFull: Chronik, Blaine A. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2022 Type: published Y: 2022 Identifiers: – Type: issn-print Value: 07403194 Numbering: – Type: volume Value: 87 – Type: issue Value: 6 Titles: – TitleFull: Magnetic Resonance in Medicine Type: main |
| ResultId | 1 |
