37 results about "Retina Layer" patented technology

A model human eye suitable for practicing surgical procedures, comprising a hemispherical-shaped bottom assembly having a bowl-shaped substrate disposed therein, a retinal layer disposed on the bowl-shaped substrate, and a hemispherical-shaped top portion attached to the bottom portion, the top portion comprising a visually transparent cornea portion and a visually opaque sclera portion, wherein the cornea portion and the sclera portion are integrally molded, wherein the cornea portion comprises a posterior corneal surface, wherein a distance from the posterior corneal surface to the retinal layer is an axial length. The model human eye is particularly suited for practicing A-scan ultrasound biometry and optical coherence biometry.

One aspect of embodiments of the present invention relates to an image processing apparatus which specifies one of boundary positions of retina layers in a fundus image showing a retina tomosynthesis, sets a distance transfer function for converting the distance from the specified boundary position to a parameter expressing opacity such that the peak position of the opacity is set to a predetermined position in the retina, sets a luminance transfer function for converting a luminance value of the fundus image to the parameter expressing opacity, and generates a translucent display image by calculating the opacity of respective positions of the tomosynthesis using the distance transfer function and the luminance transfer function, and by volume rendering.

An image processing apparatus comprising, boundary extraction means for detecting boundaries of retina layers from a tomogram of an eye to be examined, exudate extraction means for extracting an exudate region from a fundus image of the eye to be examined, registration means for performing registration between the tomogram and the fundus image, and calculating a spatial correspondence between the tomogram and the fundus image, specifying means for specifying a region where an exudate exists in the tomogram using the boundaries of the retina layers, the exudate region, and the spatial correspondence, likelihood calculation means for calculating likelihoods of existence of the exudate in association with the specified region, and tomogram exudate extraction means for extracting an exudate region in the tomogram from the specified region using the likelihoods.

A tomogram observation apparatus characterized by comprising: detection means for detecting a region in which an optic nerve extends from a retina layer of an eye to be examined to outside the eye to be examined; and generation means for generating a two-dimensional tomogram of a portion around an optic papilla of the eye to be examined, based on a position of the region.

The invention discloses a choroidal neovascularization growth protection method combining a constitutive model with a finite element. The method comprises the steps of image preprocessing; area division and partition, specifically including dividing an image into four areas consisting of a CNV area, an outer retina layer, an inner retina layer and a choroids layer; meshing, specifically including performing tetrahedral mesh generation on the four areas; modeling, specifically including modeling by using a hyperelastic biomechanical model and a reaction diffusion equation, and adding quality variation after choroidal neovascularization grows into an equation as a source item, thus causing a deformation gradient tensor to continuously change according to the growth of the new vessel; optimizing the model, computing the best accuracy rate, and performing parameter test; and fitting a parameter curve according to a parameter predicted at each time point, and predicting the growth parameter of the last time point to acquire a prediction result. According to the method provided by the invention, the biomechanical model can be built in a more flexible and personalized mode, the model assumes that organization is orthotropic, the good prediction results can be provided for non-linear large-deformation areas, and the accuracy is high.

The invention relates to an OCT image layer segmentation method based on random forest and compound activity curve, which is designed for accurate segmentation of retinal layer and effusion. The OCT image layer segmentation method based on random forest and compound activity curve of the present invention, comprises: obtains OCT image feature training random forest classifier; Composite activity curve algorithm obtains final SF1; Extract 24 features of OCT image, use random forest classifier , the OCT image layer segmentation method based on random forest and compound activity curve in the present invention has simple operation and accurate detection result. It overcomes the problems of low recognition rate and poor segmentation effect of existing OCT image segmentation algorithms for lesions.