Influence of the grid topology of free-form deformation models on the performance of 3D strain estimation in echocardiography

Authors:
Brecht Heyde;Daniel Barbosa;Piet Claus;Frederik Maes;Jan D'hooge
Affiliations:
Cardiovascular Imaging and Dynamics, University of Leuven, Leuven, Belgium;Cardiovascular Imaging and Dynamics, University of Leuven, Leuven, Belgium;Cardiovascular Imaging and Dynamics, University of Leuven, Leuven, Belgium;Medical Image Computing, University of Leuven, Leuven, Belgium;Cardiovascular Imaging and Dynamics, University of Leuven, Leuven, Belgium,Medical Imaging Lab, Norwegian Institute for Science & Technology, Trondheim, Norway
Venue:
FIMH'13 Proceedings of the 7th international conference on Functional Imaging and Modeling of the Heart
Year:
2013

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Abstract

Different B-spline grid topologies of free-form-deformation (FFD) models have been proposed for 3D strain estimation in echocardiography: classical FFD models are defined in Cartesian space (CFFD), whereas others adapt an anatomically oriented B-spline grid (AFFD) which allow to model the cardiac motion in a more physiological way. The practical advantage of the latter grid topology remains to be proven for echocardiography. In this work, the performance of both models was therefore directly compared using simulated data. Both motion and strain accuracy were competitive for the CFFD and AFFD model: mean error=0.44mm vs 0.48mm, strain error=9.0% vs 7.3% (radial), 2.4% vs 3.1% (longitudinal), 1.9% vs 2.2% (circumferential). However, moving to an anatomical grid topology appears better suited for cardiac deformation estimation as model complexity and computation time was reduced considerably (1051s vs 595s).