Bilateral orthogonality generative acquisitions method for homogeneous T2* images using parallel transmission at 7 T.
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| Title: | Bilateral orthogonality generative acquisitions method for homogeneous T2* images using parallel transmission at 7 T. |
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| Authors: | Boğa, Çelik1 (AUTHOR) celikboga@gmail.com, Henning, Anke1 (AUTHOR) |
| Source: | Magnetic Resonance in Medicine. Mar2025, Vol. 93 Issue 3, p1043-1058. 16p. |
| Subjects: | Shortwave radio, Radio transmitters & transmission, Contrast effect, Inductive effect, Number systems |
| Abstract: | Purpose: The novel bilateral orthogonality generative acquisitions method has been developed for homogeneous T2*$$ {\mathrm{T}}_2^{\ast } $$ images without the effects of transmit field inhomogeneity using a parallel‐transmission (pTx) system at 7 T. Theory and Methods: A new method has been introduced using four low‐angle gradient‐echo (GRE) acquisitions to obtain homogeneous T2*$$ {\mathrm{T}}_2^{\ast } $$ contrast by removing the effects of transmit field inhomogeneity in the pTx system. First, two input images are obtained in circularly polarized mode and another mode in which the first transmit channel or channel group have an additional transmit phase of π. The last two acquisitions are single‐channel acquisitions for a dual‐channel system or single‐channel group acquisitions for more than two channels. The introduced method is demonstrated in dual‐channel and eight‐channel pTx systems using phantom and whole‐brain in vivo experiments. Noise performance of the proposed method is also tested against the ratio of two GRE acquisitions and the TIAMO (time‐interleaved acquisitions of modes) method. Results: Th new method results in more homogeneous T2*$$ {\mathrm{T}}_2^{\ast } $$ contrast in the final images than the compared methods, particularly in the low‐intensity regions of circularly polarized–mode images for the images obtained via ratio of the two GRE acquisitions. Conclusion: The introduced method is easy to implement, robust, and provides homogeneous T2*$$ {\mathrm{T}}_2^{\ast } $$ images of the whole brain using pTx systems with any number of channels, compared with the ratio of the two GRE images and the TIAMO method. [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: 181922271 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Bilateral orthogonality generative acquisitions method for homogeneous T2* images using parallel transmission at 7 T. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Boğa%2C+Çelik%22">Boğa, Çelik</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> celikboga@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Henning%2C+Anke%22">Henning, Anke</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>. Mar2025, Vol. 93 Issue 3, p1043-1058. 16p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Shortwave+radio%22">Shortwave radio</searchLink><br /><searchLink fieldCode="DE" term="%22Radio+transmitters+%26+transmission%22">Radio transmitters & transmission</searchLink><br /><searchLink fieldCode="DE" term="%22Contrast+effect%22">Contrast effect</searchLink><br /><searchLink fieldCode="DE" term="%22Inductive+effect%22">Inductive effect</searchLink><br /><searchLink fieldCode="DE" term="%22Number+systems%22">Number systems</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Purpose: The novel bilateral orthogonality generative acquisitions method has been developed for homogeneous T2*$$ {\mathrm{T}}_2^{\ast } $$ images without the effects of transmit field inhomogeneity using a parallel‐transmission (pTx) system at 7 T. Theory and Methods: A new method has been introduced using four low‐angle gradient‐echo (GRE) acquisitions to obtain homogeneous T2*$$ {\mathrm{T}}_2^{\ast } $$ contrast by removing the effects of transmit field inhomogeneity in the pTx system. First, two input images are obtained in circularly polarized mode and another mode in which the first transmit channel or channel group have an additional transmit phase of π. The last two acquisitions are single‐channel acquisitions for a dual‐channel system or single‐channel group acquisitions for more than two channels. The introduced method is demonstrated in dual‐channel and eight‐channel pTx systems using phantom and whole‐brain in vivo experiments. Noise performance of the proposed method is also tested against the ratio of two GRE acquisitions and the TIAMO (time‐interleaved acquisitions of modes) method. Results: Th new method results in more homogeneous T2*$$ {\mathrm{T}}_2^{\ast } $$ contrast in the final images than the compared methods, particularly in the low‐intensity regions of circularly polarized–mode images for the images obtained via ratio of the two GRE acquisitions. Conclusion: The introduced method is easy to implement, robust, and provides homogeneous T2*$$ {\mathrm{T}}_2^{\ast } $$ images of the whole brain using pTx systems with any number of channels, compared with the ratio of the two GRE images and the TIAMO method. [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.30329 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 1043 Subjects: – SubjectFull: Shortwave radio Type: general – SubjectFull: Radio transmitters & transmission Type: general – SubjectFull: Contrast effect Type: general – SubjectFull: Inductive effect Type: general – SubjectFull: Number systems Type: general Titles: – TitleFull: Bilateral orthogonality generative acquisitions method for homogeneous T2* images using parallel transmission at 7 T. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Boğa, Çelik – PersonEntity: Name: NameFull: Henning, Anke IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 03 Text: Mar2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 07403194 Numbering: – Type: volume Value: 93 – Type: issue Value: 3 Titles: – TitleFull: Magnetic Resonance in Medicine Type: main |
| ResultId | 1 |
