Anisotropic finite element modeling method based on harmonic field for patient-specific sclera

A technology of anisotropy and modeling method, which is applied in the cross-field of 3D finite element modeling and medical imaging, can solve problems such as inapplicability, and achieve accurate and high-quality results

Active Publication Date: 2017-06-30
CENT SOUTH UNIV
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Problems solved by technology

[0004] Some studies use regular mapped hexahedral grids to generate regular hemispherical sclera with the same thickness, this strategy cannot be applied to sclera with specific geometry

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  • Anisotropic finite element modeling method based on harmonic field for patient-specific sclera
  • Anisotropic finite element modeling method based on harmonic field for patient-specific sclera
  • Anisotropic finite element modeling method based on harmonic field for patient-specific sclera

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Embodiment Construction

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0031] The harmonic field-based anisotropic finite element modeling method for the patient-specific sclera provided by the present invention smoothly distributes a regular hexahedral grid on the irregular patient-specific sclera. Among them, the harmonic field is one of the most effective tools for smooth distribution. Its gradient vector field and contour field smooth stream on the surface of the model, and they are perpendicular to each other. They can be use...

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Abstract

The invention discloses an anisotropic finite element modeling method based on harmonic field for patient-specific sclera, which comprises the following steps that high precision laser scanning is applied to attain a stereoscopic model of a patient-specific sclera; the stereoscopic model is designated with a sclera weight and provided with a umbrella operator to attain the harmonic field; the harmonic field is provided with constrained conditions, the gradient field and the contour field of the harmonic field are distributed; through the gradient field and the contour field, a regular hexahedral mesh is distributed smoothly on an irregular sclera; the stereoscopic model is provided with anisotropic material parameters based on the harmonic field; the experiment result is compared. The anisotropic finite element modeling method based on harmonic field for patient-specific sclera can provide effective modeling for patient-specific sclera. Anisotropic material orientation field are added, thereby high accuracy and quality of the modeling being guaranteed, and irregular hemisphere sclera being provided with individual parameters.

Description

technical field [0001] The present invention relates to the interdisciplinary technical fields of three-dimensional finite element modeling and medical imaging, and in particular, relates to a finite element modeling method for anisotropic patient-specific sclera based on a harmonic field. Background technique [0002] Recently, researchers have focused on understanding the biomechanical properties of the sclera, as the biomechanical properties of the sclera and cribriform plate determine the biomechanical changes in the optic nerve head, which are important in the management of retinal neuronal cell loss due to increased intraocular pressure and Optic nerve damage plays a prominent role. [0003] The back of the eye consists of three layers: the sclera, the choroid, and the retina, with the sclera being the thickest and the retina the thinnest. When the same pressure is applied to the sclera, choroid, and retina, their tangent moduli are in different orders of magnitude, a...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06T17/00
CPCG06T17/00G16H50/50
Inventor 廖胜辉李志平刘熙尧邹北骥
Owner CENT SOUTH UNIV
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