Multiphoton simultaneous multislice imaging.
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| Title: | Multiphoton simultaneous multislice imaging. |
|---|---|
| Authors: | Ipek, Tanya Deniz1 (AUTHOR), Han, Victor1 (AUTHOR), Maravilla, Julian Adolfo1 (AUTHOR), Lustig, Michael1 (AUTHOR), Liu, Chunlei1,2 (AUTHOR) chunlei.liu@berkeley.edu |
| Source: | Magnetic Resonance in Medicine. Oct2024, Vol. 92 Issue 4, p1584-1599. 16p. |
| Subjects: | Phase coding |
| Abstract: | Purpose: To develop multiphoton excitation techniques for simultaneous multislice (SMS) imaging and evaluate their performance and specific absorption rate (SAR) benefit. To improve multiphoton SMS reconstruction quality with a novel CAIPIRINHA (controlled aliasing in parallel imaging results in higher acceleration) design. Theory and Methods: When a conventional single‐slice RF field is applied together with an oscillating gradient field, the two can combine to generate multiphoton excitation at multiple discrete spatial locations. Because the conventional RF is reused at multiple spatial locations, multiphoton excitation offers reduced SAR for SMS applications. CAIPIRINHA shifts are often used to improve parallel‐imaging acceleration. Interestingly, CAIPIRINHA‐type shifts can be obtained for multiphoton SMS by updating the oscillating gradient phase at every phase encode. In this work, both a gradient‐echo and a spin‐echo sequence with multiphoton CAIPIRINHA‐SMS excitation pulses are implemented for in vivo human imaging at 3 T. Results: For three slices, multiphoton SMS provides a 51% reduction in SAR compared with conventional superposition SMS, whereas for five slices, SAR is reduced by 66%. Multiphoton SMS outperforms PINS (power independent of number of slices) and MultiPINS in terms of SAR reduction especially when the pulse duration is short, slices are thin, and/or the slice spacing is large. A custom CAIPIRINHA phase‐encoding design for multiphoton SMS significantly improves reconstruction quality. Conclusion: Multiphoton SMS excitation can be obtained by combining conventional single‐slice RF pulses with an oscillating gradient and offers significant SAR benefits compared with conventional superposition SMS. A novel CAIPIRINHA design allows higher multiband factors for multiphoton SMS imaging. [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: 178558362 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Multiphoton simultaneous multislice imaging. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ipek%2C+Tanya+Deniz%22">Ipek, Tanya Deniz</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Han%2C+Victor%22">Han, Victor</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Maravilla%2C+Julian+Adolfo%22">Maravilla, Julian Adolfo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lustig%2C+Michael%22">Lustig, Michael</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Chunlei%22">Liu, Chunlei</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> chunlei.liu@berkeley.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Magnetic+Resonance+in+Medicine%22">Magnetic Resonance in Medicine</searchLink>. Oct2024, Vol. 92 Issue 4, p1584-1599. 16p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Phase+coding%22">Phase coding</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Purpose: To develop multiphoton excitation techniques for simultaneous multislice (SMS) imaging and evaluate their performance and specific absorption rate (SAR) benefit. To improve multiphoton SMS reconstruction quality with a novel CAIPIRINHA (controlled aliasing in parallel imaging results in higher acceleration) design. Theory and Methods: When a conventional single‐slice RF field is applied together with an oscillating gradient field, the two can combine to generate multiphoton excitation at multiple discrete spatial locations. Because the conventional RF is reused at multiple spatial locations, multiphoton excitation offers reduced SAR for SMS applications. CAIPIRINHA shifts are often used to improve parallel‐imaging acceleration. Interestingly, CAIPIRINHA‐type shifts can be obtained for multiphoton SMS by updating the oscillating gradient phase at every phase encode. In this work, both a gradient‐echo and a spin‐echo sequence with multiphoton CAIPIRINHA‐SMS excitation pulses are implemented for in vivo human imaging at 3 T. Results: For three slices, multiphoton SMS provides a 51% reduction in SAR compared with conventional superposition SMS, whereas for five slices, SAR is reduced by 66%. Multiphoton SMS outperforms PINS (power independent of number of slices) and MultiPINS in terms of SAR reduction especially when the pulse duration is short, slices are thin, and/or the slice spacing is large. A custom CAIPIRINHA phase‐encoding design for multiphoton SMS significantly improves reconstruction quality. Conclusion: Multiphoton SMS excitation can be obtained by combining conventional single‐slice RF pulses with an oscillating gradient and offers significant SAR benefits compared with conventional superposition SMS. A novel CAIPIRINHA design allows higher multiband factors for multiphoton SMS imaging. [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.30148 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 1584 Subjects: – SubjectFull: Phase coding Type: general Titles: – TitleFull: Multiphoton simultaneous multislice imaging. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ipek, Tanya Deniz – PersonEntity: Name: NameFull: Han, Victor – PersonEntity: Name: NameFull: Maravilla, Julian Adolfo – PersonEntity: Name: NameFull: Lustig, Michael – PersonEntity: Name: NameFull: Liu, Chunlei IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 07403194 Numbering: – Type: volume Value: 92 – Type: issue Value: 4 Titles: – TitleFull: Magnetic Resonance in Medicine Type: main |
| ResultId | 1 |
