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Keratectasia measurement method based on optical CT

A technology of corneal dilatation, measurement method, applied in the direction of medical science, equipment for testing eyes, diagnosis, etc., capable of solving problems such as differences in posterior surface and total refractive power

Active Publication Date: 2015-06-10
维视艾康特(广东)医疗科技股份有限公司 +1
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  • Claims
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Problems solved by technology

In addition, the refractive power of the anterior surface of the cornea measured by the two anterior segment analysis systems is relatively consistent, but there is a certain difference in the posterior surface and total refractive power.

Method used

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  • Keratectasia measurement method based on optical CT
  • Keratectasia measurement method based on optical CT
  • Keratectasia measurement method based on optical CT

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Embodiment Construction

[0018] The embodiments of the present invention will be further described below in conjunction with the drawings:

[0019] The present invention provides: a corneal dilatation measurement method based on optical CT, which includes the following steps: step one, obtain a full corneal three-dimensional tomographic image through optical CT with a long scan depth, and the scan width and depth of the optical CT with long scan depth are respectively 18 mm and 7 mm, covering the entire cornea range. The optical CT system involved in this patent uses an infrared diode light source with a wavelength of 840 nm and a bandwidth of 45 nm, with an axial resolution of about 5.0 m and a scanning speed of 20 frames per second. Using a telecentric design scanning probe, the non-deformation scanning range can reach 20mm (width) × 7.7mm (depth), realizing three-dimensional tomography of the whole cornea; step two, using the shortest path and dynamic programming optimization algorithm to extract the f...

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Abstract

The invention relates to a keratectasia measurement method based on optical CT. The keratectasia measurement method comprises the following steps: 1, acquiring a full-cornea three-dimensional cross section image through optical CT at a long scanning depth; step 2, adopting the shortest path and a dynamic programming optimization algorithm to automatically extract the height information of front and rear surfaces of the full cornea and rebuilding a three-dimensional full-cornea height information graph based on image feature information; step 3, building two indexes representing cornea surface irregularity, namley surface extension rate (as shown in the specification) and cornea surface curvature square (as shown in the specification) based on the height information of the front and rear surfaces of the full cornea. According to the invention, the full-cornea three-dimensional cross section image is acquired through optical CT at the long scanning depth, and the two indexes representing cornea surface irregularity, namely the surface extension rate (as shown in the specification) and the cornea surface curvature square (as shown in the specification) are built.

Description

Technical field [0001] The invention relates to the field of corneal measurement, in particular to a corneal dilatation measurement method based on optical CT. Background technique [0002] As the transparent tissue structure of the foremost part of the eyeball, the cornea is an important part of the refractive system of the eyeball while ensuring the integrity of the eyeball wall. The corneal refractive power of normal people is about 43.25D, which accounts for about 74% of the total refractive power of the whole eye of 58.60D. The surface of the cornea is not a standard spherical surface, only the central 1 / 3 optical zone is approximated to a spherical surface. The radius of curvature of the front surface is about 7.7-7.8mm, and the radius of curvature of the back surface is about 6.22-6.80mm. The cornea is responsible for most of the convergence function during the eyeball imaging process, and small changes in its surface may affect the imaging effect and visual quality. [00...

Claims

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Application Information

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IPC IPC(8): A61B3/14A61B3/107
Inventor 沈梅晓许哲黄胜海吕帆姜珺袁一民
Owner 维视艾康特(广东)医疗科技股份有限公司
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