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Whole‐brain T2 mapping with radial sampling and retrospective motion correction at 3T.

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Title: Whole‐brain T2 mapping with radial sampling and retrospective motion correction at 3T.
Authors: Corbin, Nadège1 (AUTHOR) nadege.corbin@rmsb.u-bordeaux.fr, Trotier, Aurelien J.1 (AUTHOR), Anandra, Serge2 (AUTHOR), Kadalie, Emile1 (AUTHOR), Dallet, Laurence2 (AUTHOR), Miraux, Sylvain1,2 (AUTHOR), Ribot, Emeline J.1 (AUTHOR)
Source: Magnetic Resonance in Medicine. Mar2025, Vol. 93 Issue 3, p1026-1042. 17p.
Subjects: Magnetic resonance imaging, Child patients, White matter (Nerve tissue), Volunteers, Volunteer service
Abstract: Purpose: Several barriers prevent the use of whole‐brain T2 mapping in routine use despite increasing interest in this parameter. One of the main barriers is the long scan time resulting in patient discomfort and motion corrupted data. To address this challenge, a method for accurate whole‐brain T2 mapping with a limited acquisition time and motion correction capabilities is investigated. Methods: A 3D radial multi‐echo spin‐echo sequence was implemented with optimized sampling trajectory enabling the estimation of intra‐scan motion, subsequently used to correct the raw data. Motion corrected echo images are then reconstructed with linear subspace constrained reconstruction. Experiments were carried out on phantom and volunteers at 3T to evaluate the accuracy of the T2 estimation, the sensitivity to lesions and the efficiency of the correction on motion corrupted data. Results: Whole‐brain T2 mapping acquired in less than 7 min enabled the depiction of lesions in the white matter with longer T2. Data retrospectively corrupted with typical motion traces of pediatric patients highly benefited from the motion correction by reducing the error in T2 estimates within the lesions. All datasets acquired on seven volunteers, with deliberate motion, also showed that motion corrupted T2 maps could be improved with the retrospective motion correction both at the voxel level and the structure level. Conclusion: A whole‐brain T2 mapping sequence with retrospective intra‐scan motion correction and reasonable acquisition time is proposed. The method necessitates advanced iterative reconstruction strategies but no additional navigator, external device, or increased scan time is required. [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.)
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  Data: Whole‐brain T<subscript>2</subscript> mapping with radial sampling and retrospective motion correction at 3T.
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  Data: <searchLink fieldCode="JN" term="%22Magnetic+Resonance+in+Medicine%22">Magnetic Resonance in Medicine</searchLink>. Mar2025, Vol. 93 Issue 3, p1026-1042. 17p.
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  Data: <searchLink fieldCode="DE" term="%22Magnetic+resonance+imaging%22">Magnetic resonance imaging</searchLink><br /><searchLink fieldCode="DE" term="%22Child+patients%22">Child patients</searchLink><br /><searchLink fieldCode="DE" term="%22White+matter+%28Nerve+tissue%29%22">White matter (Nerve tissue)</searchLink><br /><searchLink fieldCode="DE" term="%22Volunteers%22">Volunteers</searchLink><br /><searchLink fieldCode="DE" term="%22Volunteer+service%22">Volunteer service</searchLink>
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  Label: Abstract
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  Data: Purpose: Several barriers prevent the use of whole‐brain T2 mapping in routine use despite increasing interest in this parameter. One of the main barriers is the long scan time resulting in patient discomfort and motion corrupted data. To address this challenge, a method for accurate whole‐brain T2 mapping with a limited acquisition time and motion correction capabilities is investigated. Methods: A 3D radial multi‐echo spin‐echo sequence was implemented with optimized sampling trajectory enabling the estimation of intra‐scan motion, subsequently used to correct the raw data. Motion corrected echo images are then reconstructed with linear subspace constrained reconstruction. Experiments were carried out on phantom and volunteers at 3T to evaluate the accuracy of the T2 estimation, the sensitivity to lesions and the efficiency of the correction on motion corrupted data. Results: Whole‐brain T2 mapping acquired in less than 7 min enabled the depiction of lesions in the white matter with longer T2. Data retrospectively corrupted with typical motion traces of pediatric patients highly benefited from the motion correction by reducing the error in T2 estimates within the lesions. All datasets acquired on seven volunteers, with deliberate motion, also showed that motion corrupted T2 maps could be improved with the retrospective motion correction both at the voxel level and the structure level. Conclusion: A whole‐brain T2 mapping sequence with retrospective intra‐scan motion correction and reasonable acquisition time is proposed. The method necessitates advanced iterative reconstruction strategies but no additional navigator, external device, or increased scan time is required. [ABSTRACT FROM AUTHOR]
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  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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        Value: 10.1002/mrm.30328
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      – TitleFull: Whole‐brain T2 mapping with radial sampling and retrospective motion correction at 3T.
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              Text: Mar2025
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              Y: 2025
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