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The electromagnetic properties of a new volume resonator coil for MR neuroimaging are studied. This coil design is based on a resonator coil called PERES coil. A commercial software tool based on the finite-element method is used to compute the electric and magnetic fields for the quasi-static regime for a specific layout of two coils with 4 rectangular-shaped coils each. Computational experiments...
The goal of the project is to investigate new computational tools for understanding normal upper airway mechanics and the pathophysiology of obstructive sleep apnea (OSA), a disorder characterized by repetitive pharyngeal collapse and occlusion during sleep. To relate the airway mechanical parameters to anatomy, and explore the roles of primary muscle properties, airway shape and structure, a new...
In order to study the biomechanical mechanism properties of intervertebral disc herniation, combining the CT and MRI data-based anatomical structure of spine. A three-dimensional geometric model of the lumber disk was constructed. Based on the geometric model, a three-dimensional finite element modeling (FEM) for biomechanical analysis has been created. The FEM will represents a promising tool in...
The diagnosis of cardiovascular disease requires precise assessment of both morphology and function of the heart. Currently, magnetic resonance imaging (MRI) provides a useful tool for accurate and reproducible assessment of regional function of the left ventricle noninvasively. MR tagging produces images of the heart that can be analyzed using harmonic phase (HARP) method to describe the regional...
In studying bioelectromagnetic problems, finite element method offers several advantages over other conventional methods such as boundary element method. It allows truly volumetric analysis and incorporation of material properties such as anisotropy. Mesh generation is the first requirement in the finite element analysis and there are many different approaches in mesh generation. However conventional...
Quantitative assessment of the shape and motion variability of the heart has important implications for the diagnosis and treatment of cardiac diseases. In this paper, we present a unified methodology which simultaneously recovers the shape and motion of the left ventricle, including the endo-, epi-, and mid-wall myocardium. The left ventricle is modeled as an isotropic linear elastic material, and...
This paper presents a complete method estimating the displacement field of bodies constrained by an articulated model such as the neck area. Indeed bony structures between different patient images, such as vertebras, may rigidly move while other tissues may deform. The method is divided into 3 steps. The method first registers the articulated rigid bodies together. Then it propagates the deformation...
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