JP-7855120-B2 - Ophthalmic imaging equipment

Inventors

• 山口 達夫
• 廣瀬 僚一

Assignees

• 株式会社トプコン

Dates

Publication Date

20260507

Application Date

20250513

Claims (4)

1. A data acquisition unit that collects data by applying optical coherence tomography (OCT) scans to the eye under examination, An image construction unit constructs an image from the data collected by the data acquisition unit, A focal position changing unit is provided in the optical path of the measurement light projected onto the eye under examination by the data acquisition unit, A scan control unit controls the data acquisition unit according to a scan pattern that includes a continuous first partial pattern for the central region of the OCT scan application area and a continuous second partial pattern for the peripheral region. A focus control unit controls the focus position changing unit to apply a first focal position in parallel with applying an OCT scan to at least a portion of the first partial pattern, and to apply a second focal position different from the first focal position in parallel with applying an OCT scan to at least a portion of the second partial pattern, It includes a parameter setting unit for setting focus control parameters provided to the focus control unit, Prior to the OCT scan according to the scan pattern, the data acquisition unit applies a preparatory OCT scan that passes through both the central region and the peripheral region to the eye under examination. The image reconstruction unit constructs a preliminary image from the data collected by the preliminary OCT scan. The parameter setting unit sets one or more focus control parameters based on the preparatory image constructed by the image construction unit. After the parameter setting unit sets the one or more focus control parameters, the scan control unit causes the data acquisition unit to perform the OCT scan according to the scan pattern. An ophthalmic imaging apparatus characterized in that, in parallel with the OCT scan according to the scan pattern, the focus control unit controls the focus position changing unit according to the one or more focus control parameters set by the parameter setting unit.
2. The ophthalmic imaging apparatus according to claim 1, characterized in that the preparatory OCT scan includes two B-scans that are orthogonal to each other.
3. The ophthalmic imaging apparatus according to claim 1 or 2, characterized in that the one or more focus control parameters include a focus position change range including the first focal position and the second focal position.
4. The ophthalmic imaging apparatus according to any one of claims 1 to 3, characterized in that the one or more focus control parameters include at least one of the movement speed and movement acceleration of the focal position.

Description

This invention relates to an ophthalmic imaging device. In ophthalmology, the importance of diagnostic imaging and image analysis is increasing. The application of optical coherence tomography (OCT) to ophthalmology is particularly accelerating this trend. OCT enables three-dimensional imaging of the eye under examination, as well as three-dimensional structural and functional analysis, proving invaluable for obtaining the distribution of various measured values, for example. In recent years, efforts have been made to expand the OCT scan range, that is, to widen the field of view of OCT. For example, to scan a wide area from the center to the periphery of the fundus, devices have been developed that feature increased deflection angles of optical scanners (such as galvanometer mirrors) and corresponding optimizations in structure, control, and imaging (see, for example, Patent Documents 1 and 2). When OCT scans (generally raster scans) are applied to a wide area of the fundus, image quality deteriorates, particularly in areas far from the center of the fundus (referred to as the peripheral region), due to the effects of aberrations in the ocular optical system. This is because the aberrations of the ocular ball are greater in the peripheral region than in the central region of the fundus (see, for example, Non-Patent Document 1). To mitigate this image degradation, focus control could be considered. However, since the speed of focus control is considerably slower than the speed of OCT scanning (e.g., the repetition rate of the A-scan), applying focus control while simultaneously applying high-speed raster scanning to a wide area of the fundus is not practical. Japanese Patent Publication No. 2017-086311Japanese Patent Publication No. 2017-047113 JAMES POLANS, 4 others, "Wide-field optical model of the human eye with asymmetrically tilted and decentered lens that reproduces measured ocular aberrations", Optica, February 2015, Vol.2, No.2, p.124-134 This is a schematic diagram illustrating an example of the configuration of an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of the configuration of an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of the configuration of an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of the configuration of an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of a process performed by an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of a process performed by an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of a process performed by an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of a process performed by an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of a process performed by an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of a process performed by an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of a process performed by an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of a process performed by an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of a process performed by an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of a process performed by an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of a process performed by an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of a process performed by an ophthalmic imaging device according to an exemplary embodiment.This is a flowchart illustrating an example of the operation of an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of the operation of an ophthalmic imaging device according to an exemplary embodiment.This is a schematic diagram illustrating an example of the operation of an ophthalmic imaging device according to an exemplary embodiment. An exemplary embodiment of an ophthalmic imaging apparatus, its control method, program, and recording medium will be described in detail with reference to the drawings. The disclosures of the literature cited herein and any other known technology can be incorporated into the embodiments. Furthermore, unless otherw