JP-2026076223-A - Image processing method, image processing device, ophthalmic device, and program

JP2026076223AJP 2026076223 AJP2026076223 AJP 2026076223AJP-2026076223-A

Abstract

[Solution] The image processing device irradiates the eye under examination with light from a light source using an optical system with a first numerical aperture, and detects interference light between the signal light propagated by the optical system with a second numerical aperture from the reflected light from the eye under examination due to the irradiated light and the reference light obtained by splitting the light from the light source, thereby acquiring information indicating the interference light (S200). It then performs a first process (S202) in which it projects the information indicating the interference light onto a four-dimensional frequency aperture formed by the optical system with the first numerical aperture and the optical system with the second numerical aperture in a four-dimensional space of the frequency of the light source and the frequency of the light from the eye under examination due to the signal light, and a second process (S204) in which it projects the projected information onto a three-dimensional space. [Effect] The generated OCT images have reduced information loss while maintaining resolution, resulting in high-precision OCT images that faithfully reflect the condition of the fundus in the examined eye. [Selection Diagram] Figure 10

Inventors

福武直樹
安野嘉晃
巻田修一

Assignees

株式会社ニコン
国立大学法人筑波大学

Dates

Publication Date: 20260511
Application Date: 20260115
Priority Date: 20220324

Claims (1)

An image processing method in an image processing device performed by a processor, Light from a light source is shone onto the object to be irradiated by an optical system with a first numerical aperture, and information indicating the interference light obtained by detecting the interference light between the signal light propagated by the reflected light from the object to be irradiated by the optical system with a second numerical aperture and the reference light obtained by splitting the light from the light source, An image processing method comprising: a first process of projecting information indicating the interference light onto a four-dimensional frequency aperture formed by the optical system of the first numerical aperture and the optical system of the second numerical aperture in a four-dimensional space of the frequency of light emitted from the light source and the frequency of three-dimensional light representing the irradiated object; and a second process of projecting the projected information onto three-dimensional space.

Description

The technology disclosed herein relates to an image processing method, an ophthalmic device, and a program. Optical coherence tomography (OCT) allows for the measurement of the structure of the eye using reflected light from different layers in the fundus of the eye being examined, and can obtain one-dimensional depth images, two-dimensional tomographic images, and three-dimensional images. For example, a technique for generating data on the structure of an eye using OCT is known (U.S. Patent No. 10238281). A first aspect of the technology of this disclosure is, An image processing method in an image processing device performed by a processor, Light from a light source is irradiated onto the object to be irradiated using an optical system with a first numerical aperture, and information indicating the interference light obtained by detecting the interference light between the signal light propagated by the reflected light from the object to be irradiated using an optical system with a second numerical aperture and the reference light obtained by splitting the light from the light source, The image processing method includes a first process of projecting information indicating the interference light onto a four-dimensional frequency aperture formed by the optical system of the first numerical aperture and the optical system of the second numerical aperture, in a four-dimensional space of the frequency of the light source and the frequency of the three-dimensional light representing the irradiated object; and a second process of projecting the projected information into three-dimensional space. A second aspect of the technology of this disclosure is, In an image processing apparatus comprising memory and a processor, The aforementioned processor, Light from a light source is irradiated onto the object to be irradiated using an optical system with a first numerical aperture, and information indicating the interference light obtained by detecting the interference light between the signal light propagated by the reflected light from the object to be irradiated using an optical system with a second numerical aperture and the reference light obtained by splitting the light from the light source, This image processing apparatus performs the following steps: a first process of projecting information indicating the interference light onto a four-dimensional frequency aperture formed by the optical system of the first numerical aperture and the optical system of the second numerical aperture, in a four-dimensional space of the frequency of the light source and the frequency of the three-dimensional light representing the irradiated object; and a second process of projecting the projected information onto a three-dimensional space. A third aspect of the technology of this disclosure is: On the computer, Light from a light source is irradiated onto the eye under examination using an optical system with a first numerical aperture, and information indicating the interference light obtained by detecting the interference light between the signal light propagated by the reflected light from the eye under examination using an optical system with a second numerical aperture and the reference light obtained by splitting the light from the light source, This program performs the following processes: a first process of projecting information indicating the interference light onto a four-dimensional frequency aperture formed by the optical system of the first numerical aperture and the optical system of the second numerical aperture, in a four-dimensional space between the frequency of the light source and the frequency of the light from the eye being examined due to the signal light; and a second process of projecting the projected information onto a three-dimensional space. This is a schematic diagram of the ophthalmic system according to the embodiment.This is a schematic diagram of the ophthalmic apparatus according to the present invention.This is a conceptual diagram of an OCT image.This is a conceptual diagram illustrating an example of how information related to OCT images in an OCT system is represented in four-dimensional frequency space.This is a conceptual diagram showing an example of a 4D aperture A4.This is a conceptual diagram showing a part of the 4D aperture A4.This is an explanatory diagram illustrating the concept of OCT image correction processing using the double projection method.This is a conceptual diagram of the optical system in an OCT system.This is a diagram illustrating the functions implemented by the image processing program.This is a flowchart illustrating an example of an image processing workflow.This is a conceptual diagram showing an example of an OCT image according to this embodiment.This is a conceptual diagram showing a comparative example of OCT images. Hereinafter, an ophthalmic system 100 according to an embodiment of the present invention will be described with reference to the drawings