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Optical coherence tomography method and optical coherence tomography apparatus

A technology of optical coherence tomography and photographic devices, applied in the direction of using optical devices, material analysis through optical means, measuring devices, etc., can solve the problem of low lateral resolution

Active Publication Date: 2010-09-08
CANON KK
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, if the numerical aperture is reduced, then the depth of focus becomes larger, but the lateral resolution becomes lower

Method used

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  • Optical coherence tomography method and optical coherence tomography apparatus
  • Optical coherence tomography method and optical coherence tomography apparatus
  • Optical coherence tomography method and optical coherence tomography apparatus

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Embodiment Construction

[0030] Hereinafter, an optical coherence tomography apparatus according to the present embodiment will be described.

[0031] The optical coherence tomography apparatus according to the embodiment separates light from a light source into measurement light and reference light through a divided optical path. The measuring light is irradiated onto the object to be measured through the measuring optical path. The return light returned from the object to be measured when the measurement light is irradiated is guided to the detection position through the detection optical path. The focus position of the measurement light in the object to be measured (irradiation direction) can be controlled by a focus drive mechanism. The reference light is guided to the detection position through the reference light path. In the reference optical path, a mirror is set, and the position of the coherence gate can be adjusted through a mirror driving mechanism. Since the coherence gate and the focu...

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Abstract

An optical coherence tomography method according to the present invention comprises the steps of dividing an object to be measured into a plurality of measurement regions adjacent to one another in a direction of irradiation of a measurement light, and acquiring a measurement image for every measurement region based on a wavelength spectrum of a coherent light; correcting, for every measurement region, a contrast of the measurement image of the measurement region; and acquiring, for every measurement region, a tomographic image from the corrected measurement image.

Description

technical field [0001] The present invention relates to an optical coherence tomography method and an optical coherence tomography apparatus, and more particularly, to an optical coherence tomography method and an optical coherence tomography apparatus using a coherence optical system used in the medical field. Background technique [0002] Currently, there are various ophthalmic devices using optical devices. Examples of such ophthalmic devices include anterior eye imaging devices, retinal cameras, and scanning laser ophthalmoscopes (SLOs). Among them, an optical coherence tomography (OCT) apparatus can obtain tomographic images of a subject to be measured at high resolution, and thus is becoming an indispensable device for outpatient medical treatment dedicated to the retina. [0003] For example, an OCT apparatus is disclosed in Japanese Patent Application Laid-Open No. H11-325849. In the OCT device disclosed in Japanese Patent Application Laid-Open No. H11-325849, low-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/00A61B3/14
CPCG01B9/02091G01B9/02078A61B3/102G01B9/02085A61B5/0066G01N21/4795A61B5/0073G01B9/02063G01B9/02044
Inventor 末平信人
Owner CANON KK
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