A method for measuring corneal dilatation 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: 2017-01-25
杭州微晓医疗科技有限公司
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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.
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[0016] Embodiments of the present invention will be further described below in conjunction with accompanying drawings:
[0017] The present invention provides: a method for measuring corneal dilatation based on optical CT, which includes the following steps: step 1, obtain a three-dimensional tomographic image of the whole cornea through optical CT with a long scanning depth, and the scanning width and depth of the optical CT with a long scanning depth are respectively 18mm and 7mm, covering the entire cornea. The optical CT system involved in this patent uses an infrared diode light source with a wavelength of 840nm and a bandwidth of 45nm. The axial resolution is about 5.0μm, and the scanning speed is 20 frames per second. The scanning probe is carefully designed, and the scanning range without deformation can reach 20mm (width) × 7.7mm (depth), realizing three-dimensional tomographic imaging of the whole cornea; step 2, using the shortest path and the optimization algorithm ...
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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 method for measuring corneal dilation based on optical CT. Background technique [0002] As the transparent tissue structure at the front of the eyeball, the cornea ensures the integrity of the eyeball wall and is also an important part of the eye's refractive system. Normal corneal refractive power is about 43.25D, which accounts for about 74% of the total refractive power of the whole eye, which is 58.60D. The surface of the cornea is not a standard spherical surface, only the central 1 / 3 optical zone is approximately spherical, the radius of curvature of the anterior surface is about 7.7-7.8mm, and the radius of curvature of the posterior surface is about 6.22-6.80mm. The cornea is responsible for most of the converging functions in the imaging process of the eyeball, and small changes in its surface may affect the imaging effect and visual quality. [0003] The prevalen...
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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 杭州微晓医疗科技有限公司