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AssigneeTomey Corporation
InventorsKeiichiro Okamoto, Risa Higashita, Fushi Li, Makoto Kojima
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An anterior ocular segment optical coherence tomographic imaging device and an anterior ocular segment optical coherence tomographic imaging method that can accurately analyze the shape of a crystalline lens by identifying the boundary of each layer of the crystalline lens in a tomographic image of an anterior ocular segment of a subject's eye, which is taken by optical coherence tomography. A layer boundary detector calculates brightness gradients from brightness values in a tomographic image of an anterior ocular segment of a subject's eye, which is taken by optical coherence tomography, in a depth direction of the tomographic image from a cornea to a retina, detect edges b1, b2, b3, and b4 that are larger than a predetermined threshold, and identify a boundary of each layer of the crystalline lens L from positions of the edge b1, b2, b3, and b4.
An anterior ocular segment optical coherence tomographic imaging device for taking a tomographic image of an anterior ocular segment including a crystalline lens of a subject's eye using optical coherence, the device comprising a layer boundary detector configured to calculate brightness gradients from brightness values in a depth direction of the tomographic image from a cornea to a retina, detect an edge that is larger than a predetermined threshold, and identify a boundary of each layer of the crystalline lens from position of the edge, and trace boundary faces between a crystalline lens front surface and a cortex lentis, between a crystalline lens back surface and the cortex lentis, and between the nucleus lentis and the cortex lentis in the tomographic image.
An optical coherence tomographic imaging method for taking a tomographic image of an anterior ocular segment including a crystalline lens of a subject's eye by optical Coherence, the method comprising a layer boundary detection step of calculating brightness gradients from brightness values in a depth direction of the tomographic image from a cornea to a retina, detecting an edge that is larger than a predetermined threshold, and identifying a boundary of each layer of the crystalline lens as a position of the edge, and trace boundary faces between a crystalline lens front surface and a cortex lentis, between a crystalline lens back surface and the cortex lentis, and between the nucleus lentis and the cortex lentis in the tomographic image.
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