Camera-based 3D displacement measurements are only possible when two different viewing angles of the respective measurement point available. We earlier introduced a simplified reconstruction algorithm for camera-mirror where mirror reflects second view onto camera sensor to eliminate need (costly) high speed camera. In this study, we concentrate on formulating guidelines how position with respe...

AbstractOptimization-based 3D object tracking is known to be precise and fast, but sensitive large inter-frame displacements. In this paper we propose a fast effective non-local method. Based on the observation that erroneous local minimum are mostly due out-of-plane rotation, hybrid approach combining optimizations for different parameters, resulting in efficient search 6D pose space. addition...

An important application of deformable motion estimation theory is the estimation of heart motion from tagged MR image sequences. In MR tagged images, the heart appears with a spatially encoded pattern that moves with the tissue. The position of the tag pattern in each frame of the image sequence can be used to obtain sparse measurements of the heart's 3D displacement eld. In this paper, we pro...

The use of Computational Fluid Dynamics (CFD) and Continuum Mechanics (CCM) for analysis rotary positive displacement machines is exponentially increasing which was mostly allowed by the development methods generating numerical grids complex domains within machines. However there are several challenges with commercial CFD/CCM codes preventing generic CFD. These conservativeness spatial discreti...

BACKGROUND The purpose of this analysis was to evaluate the displacement patterns of the maxilla under parallel and rotational setbacks using the finite element method (FEM). MATERIAL AND METHODS A three-dimensional (3D) finite element model of a hemimaxilla was constructed. Through a conventional Le Fort I osteotomy, 2 and 3 mm of posterior movement in a parallel and rotational manner were sim...

Three-dimensional (3D) soft tissue tracking is of interest for monitoring organ motion during therapy. Our goal is to assess the tracking performance of a curvilinear 3D ultrasound probe in terms of the accuracy and precision of measured displacements. The first aim was to examine the depth dependence of the tracking performance. This is of interest because the spatial resolution varies with di...

BACKGROUND In hypertrophic cardiomyopathy, ejection fraction is normal or increased, and force-length relations are reduced. However, three-dimensional (3D) motion and deformation in vivo have not been assessed in this condition. We have reconstructed the 3D motion of the left ventricle (LV) during systole in 7 patients with hypertrophic cardiomyopathy (HCM) and 12 normal volunteers by use of m...

This paper presents a new registration algorithm, called Temporal Diffeomorphic Free Form Deformation (TDFFD), and its application to motion and strain quantification from a sequence of 3D ultrasound (US) images. The originality of our approach resides in enforcing time consistency by representing the 4D velocity field as the sum of continuous spatiotemporal B-Spline kernels. The spatiotemporal...