16 March 2006 Accurate recovery of 4D left ventricular deformations using volumetric B-splines incorporating phase based displacement estimates
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Abstract
In this paper, an improved framework for estimation of 3-D left-ventricular deformations from tagged MRI is presented. Contiguous short- and long-axis tagged MR images are collected and are used within a 4-D B-Spline based deformable model to determine 4-D displacements and strains. An initial 4-D B-spline model fitted to sparse tag line data is first constructed by minimizing a 4-D Chamfer distance potential-based energy function for aligning isoparametric planes of the model with tag line locations; subsequently, dense virtual tag lines based on 2-D phase-based displacement estimates and the initial model are created. A final 4-D B-spline model with increased knots is fitted to the virtual tag lines. From the final model, we can extract accurate 3-D myocardial deformation fields and corresponding strain maps which are local measures of non-rigid deformation. Lagrangian strains in simulated data are derived which show improvement over our previous work. The method is also applied to 3-D tagged MRI data collected in a canine.
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Jian Chen, Nicholas J. Tustison, Amir A. Amini, "Accurate recovery of 4D left ventricular deformations using volumetric B-splines incorporating phase based displacement estimates", Proc. SPIE 6143, Medical Imaging 2006: Physiology, Function, and Structure from Medical Images, 61432Q (16 March 2006); doi: 10.1117/12.655668; https://doi.org/10.1117/12.655668
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