biostudies-literatureKecskemeti SDepartment of Radiology, University of Wisconsin-MadisonEunice Kennedy Shriver National Institute of Child Health and Human DevelopmentNICHD NIH HHSNIA NIH HHSNIDA NIH HHSNIMH NIH HHSNational Institutes of Health2400-2411https://www.ebi.ac.uk/biostudies/studies/S-EPMC7396302biostudies-literatureUnknown84(5)<h4>Purpose</h4>To test the performance of the MPnRAGE motion-correction algorithm on quantitative relaxometry estimates.<h4>Methods</h4>Twelve children (9.4 ± 2.6 years, min = 6.5 years, max = 13.8 years) were imaged 3 times in a session without sedation. Stabilization padding was not used for the second and third scans. Quantitative T₁ values were estimated in each voxel on images reconstructed with and without motion correction. Mean T₁ values were assessed in various regions determined from automated segmentation algorithms. Statistical tests were performed on mean values and the coefficient of variation across the measurements. Accuracy of T₁ estimates were determined by scanning the High Precision Devices (Boulder, CO) MRI system phantom with the same protocol.<h4>Results</h4>The T₁ values obtained with MPnRAGE agreed within 4% of the reference values of the High Precision Devices phantom. The best fit line was T₁ (MPnRAGE) = 1.02 T₁ (reference)-0.9 ms, R²  = 0.9999. For in vivo studies, motion correction reduced the coefficients of variation of mean T₁ values in whole-brain tissue regions determined by FSL FAST by 74% ± 7%, and subcortical regions determined by FIRST and FreeSurfer by 32% ± 21% and 33% ± 26%, respectively. Across all participants, the mean coefficients of variation ranged from 0.8% to 2.0% for subcortical regions and 0.6% ± 0.5% for cortical regions when motion correction was applied.<h4>Conclusion</h4>The MPnRAGE technique demonstrated highly accurate values in phantom measurements. When combined with retrospective motion correction, MPnRAGE demonstrated highly reproducible T₁ values, even in participants who moved during the acquisition.Magnetic resonance in medicineThree-dimensional motion-corrected T₁ relaxometry with MPnRAGE.PMC7396302AG051216IDDRC U54 HD090256UF1 AG051216R01 AG037639DA050258R01 MH097464R34 DA050258MH100031HD094715P50 MH100031AG15001U01 AG051406R01 MH101504MH101504U54 HD090256R01 HD094715MH097464Kecskemeti SAlexander ALfalseThree-dimensional motion-corrected T₁ relaxometry with MPnRAGE.<h4>Purpose</h4>To test the performance of the MPnRAGE motion-correction algorithm on quantitative relaxometry estimates.<h4>Methods</h4>Twelve children (9.4 ± 2.6 years, min = 6.5 years, max = 13.8 years) were imaged 3 times in a session without sedation. Stabilization padding was not used for the second and third scans. Quantitative T₁ values were estimated in each voxel on images reconstructed with and without motion correction. Mean T₁ values were assessed in various regions determined from automated segmentation algorithms. Statistical tests were performed on mean values and the coefficient of variation across the measurements. Accuracy of T₁ estimates were determined by scanning the High Precision Devices (Boulder, CO) MRI system phantom with the same protocol.<h4>Results</h4>The T₁ values obtained with MPnRAGE agreed within 4% of the reference values of the High Precision Devices phantom. The best fit line was T₁ (MPnRAGE) = 1.02 T₁ (reference)-0.9 ms, R²  = 0.9999. For in vivo studies, motion correction reduced the coefficients of variation of mean T₁ values in whole-brain tissue regions determined by FSL FAST by 74% ± 7%, and subcortical regions determined by FIRST and FreeSurfer by 32% ± 21% and 33% ± 26%, respectively. Across all participants, the mean coefficients of variation ranged from 0.8% to 2.0% for subcortical regions and 0.6% ± 0.5% for cortical regions when motion correction was applied.<h4>Conclusion</h4>The MPnRAGE technique demonstrated highly accurate values in phantom measurements. When combined with retrospective motion correction, MPnRAGE demonstrated highly reproducible T₁ values, even in participants who moved during the acquisition.2020-01-01T00:00:00Z2020 Nov2025-04-04T21:57:36.048Z2022-02-11T12:15:17.564ZS-EPMC73963023230117310.1002/mrm.28283