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Cardio-respiratory motion-corrected 3D cardiac water-fat MRI using model-based image reconstruction

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Item Type:Article
Title:Cardio-respiratory motion-corrected 3D cardiac water-fat MRI using model-based image reconstruction
Creators Name:Mayer, J. and Blaszczyk, E. and Cipriani, A. and Ferrazzi, G. and Schulz-Menger, J. and Schaeffter, T. and Kolbitsch, C.
Abstract:PURPOSE: Myocardial fat infiltrations are associated with a range of cardiomyopathies. The purpose of this study was to perform cardio-respiratory motion-correction for model-based water-fat separation to image fatty infiltrations of the heart in a free-breathing, non-cardiac-triggered high-resolution 3D MRI acquisition. METHODS: Data were acquired in nine patients using a free-breathing, non-cardiac-triggered high-resolution 3D Dixon gradient-echo sequence and radial phase encoding trajectory. Motion correction was combined with a model-based water-fat reconstruction approach. Respiratory and cardiac motion models were estimated using a dual-mode registration algorithm incorporating both motion-resolved water and fat information. Qualitative comparisons of fat structures were made between 2D clinical routine reference scans and reformatted 3D motion-corrected images. To evaluate the effect of motion correction the local sharpness of epicardial fat structures was analyzed for motion-averaged and motion-corrected fat images. RESULTS: The reformatted 3D motion-corrected reconstructions yielded qualitatively comparable fat structures and fat structure sharpness in the heart as the standard 2D breath-hold. Respiratory motion correction improved the local sharpness on average by 32% ± 24% with maximum improvements of 81% and cardiac motion correction increased the sharpness further by another 15% ± 11% with maximum increases of 31%. One patient showed a fat infiltration in the myocardium and cardio-respiratory motion correction was able to improve its visualization in 3D. CONCLUSION: The 3D water-fat separated cardiac images were acquired during free-breathing and in a clinically feasible and predictable scan time. Compared to a motion-averaged reconstruction an increase in sharpness of fat structures by 51% ± 27% using the presented motion correction approach was observed for nine patients.
Keywords:3D Imaging, Fat, Heart, Model-Based, Motion-Correction, MRI
Source:Magnetic Resonance in Medicine
Page Range:1561-1574
Date:October 2022
Official Publication:https://doi.org/10.1002/mrm.29284
PubMed:View item in PubMed

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