A New Algorithm for Generating Quadrilateral Meshes and its Application to FE-Based Image Registration
نویسندگان
چکیده
The use of finite element (FE) analysis in the simulation of physical phenomena over the human body has necessitated the construction of meshes from images. Despite the availability of several tools for generating meshes for FE-based applications, most cannot deal directly with the raw pixel-wise representation of image data. Additionally, some are optimized for the construction of much simpler shapes than those encountered within the human body. In this work, we introduce a new algorithm to obtain strictly convex quadrilateral meshes of bounded size from triangulations of polygonal regions with or without polygonal holes. We present an approach to construct quadrilateral meshes from segmented images using the aforementioned algorithm, and a quantitative analysis of the quality of the meshes generated by our algorithm with respect to the performance of a FE-based image registration method that takes image meshes as input.
منابع مشابه
Q-Morph - Implementing a Quadrilateral Meshing Algorithm
This thesis treats the implementational and some theoretical aspects of the Q-Morph algorithm for 2D domains. The main application areas are within FE methods. Q-Morph uses an advancing front method for generating unstructured, almost all-quadrilateral meshes containing at most one triangle, and few irregular nodes. The main algorithm is described in [16], while the post-processing methods are ...
متن کاملDPML-Risk: An Efficient Algorithm for Image Registration
Targets and objects registration and tracking in a sequence of images play an important role in various areas. One of the methods in image registration is feature-based algorithm which is accomplished in two steps. The first step includes finding features of sensed and reference images. In this step, a scale space is used to reduce the sensitivity of detected features to the scale changes. Afterw...
متن کاملTwo New Quadrilateral Elements Based on Strain States
In this paper, two new quadrilateral elements are formulated to solve plane problems. Low sensitivity to geometric distortion, no parasitic shear error, rotational invariance, and satisfying the Felippa pure bending test are characteristics of these suggested elements. One proposed element is formulated by establishing equilibrium equations for the second-order strain field. The other suggested...
متن کاملOptimized co-registration method of Spinal cord MR Neuroimaging data analysis and application for generating multi-parameter maps
Introduction: The purpose of multimodal and co-registration In MR Neuroimaging is to fuse two or more sets images (T1, T2, fMRI, DTI, pMRI, …) for combining the different information into a composite correlated data set in order to visualization, re-alignment and generating transform to functional Matrix. Multimodal registration and motion correction in spinal cord MR Neuroimag...
متن کاملA Novel Subsampling Method for 3D Multimodality Medical Image Registration Based on Mutual Information
Mutual information (MI) is a widely used similarity metric for multimodality image registration. However, it involves an extremely high computational time especially when it is applied to volume images. Moreover, its robustness is affected by existence of local maxima. The multi-resolution pyramid approaches have been proposed to speed up the registration process and increase the accuracy of th...
متن کامل