Abstract
We develop a real time element-space non-rigid registration technique for cardiac motion tracking, enabling fast and automatic analysis of myocardial strain in tagged magnetic resonance (MR) cines. Non-rigid registration is achieved by minimizing the sum of squared differences for all pixels within a high order finite-element (FE) model customized to the specific geometry of the heart. The objective function and its derivatives are calculated in element space, and converted to image space using the Jacobian of the transformation. This enables an anisotropic distribution of user-defined model parameters, which can be customized to the application, thereby achieving fast estimations which require fewer degrees of freedom for a given level of accuracy than standard isotropic methods. A graphics processing unit (GPU) accelerated Levenberg-Marquardt procedure was implemented in Compute Unified Device Architecture (CUDA) environment to provide a fast, robust optimization procedure. The method was validated in 30 patients with wall motion abnormalities by comparison with ground truth provided by an independent expert observer using a manually-guided analysis procedure. A heart model comprising 32 parameters was capable of processing 36.5 frames per second, with an error in circumferential strain of − 1.97±1.18%. For comparison, a standard isotropic free-form deformation method requiring 324 parameters had greater error (− 3.70±1.15%) and slower frame-rate (4.5 frames/sec). In conclusion, GPU accelerated custom element-space non-rigid image registration enables real time automatic tracking of cardiac motion, and accurate estimation of myocardial strain in tagged MR cines.
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Li, B., Cowan, B.R., Young, A.A. (2011). Real Time Myocardial Strain Analysis of Tagged MR Cines Using Element Space Non-rigid Registration. In: Kimmel, R., Klette, R., Sugimoto, A. (eds) Computer Vision – ACCV 2010. ACCV 2010. Lecture Notes in Computer Science, vol 6495. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-19282-1_31
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