Cardiac Ultrasound Motion Detection by Elastic Registration Exploiting Temporal Coherence
M.J. Ledesma-Carbayo, J. Kybic, M. Sühling, P. Hunziker, M. Desco, A. Santos, M. Unser
Proceedings of the First IEEE International Symposium on Biomedical Imaging: Macro to Nano (ISBI'02), Washington DC, USA, July 7-10, 2002, vol. II, pp. 585-588.
We propose a new global registration method for estimating the cardiac displacement field in 2D sequences of ultrasound images of the heart. The basic idea is to select a reference frame (e.g., the first image of a cycle) and to map each image in the sequence to it using elastic deformation. What makes our method specific is the use of a semi-local parametric model of the deformation (spatio-temporal spline), and the reformulation of the registration task as a global spatio-temporal optimization problem. The scale of the spline model controls the smoothness of the displacement field. Our algorithm uses a multiresolution optimization strategy for higher speed and robustness.
We validated the accuracy of our algorithm by applying it to a synthetic sequence; this one heart-cycle test sequence was generated by deforming a reference frame according to a realistic motion model and by adding random noise to it. Finally, we present results on real data from normal and pathological subjects to illustrate the clinical applicability of our method.
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AUTHOR="Ledesma-Carbayo, M.J. and Kybic, J. and S{\"{u}}hling, M. and
Hunziker, P. and Desco, M. and Santos, A. and Unser, M.",
TITLE="Cardiac Ultrasound Motion Detection by Elastic Registration
Exploiting Temporal Coherence",
BOOKTITLE="Proceedings of the First {IEEE} International Symposium on
Biomedical Imaging: {M}acro to Nano ({ISBI'02})",
YEAR="2002",
editor="",
volume="{II}",
series="",
pages="585--588",
address="Washington DC, USA",
month="July 7-10,",
organization="",
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note="")