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Optical coherence tomography apparatus

An optical coherence tomography and image camera technology, which is applied in the fields of eye testing equipment, diagnosis, medical science, etc., and can solve problems such as quality deterioration and management difficulties.

Inactive Publication Date: 2013-01-02
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the downside, since the use of water for dispersion compensation involves management difficulties and quality degradation, the structure is problematic in routine use

Method used

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  • Optical coherence tomography apparatus
  • Optical coherence tomography apparatus
  • Optical coherence tomography apparatus

Examples

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no. 1 example

[0034] will refer to figure 1 An optical coherence tomography apparatus according to the present invention will be described.

[0035] figure 1 An optical coherence tomography apparatus is shown as a specific example for carrying out the present invention.

[0036] exist figure 1 In this example, the light source 100 is a SLD (Super Light Emitting Diode) in this embodiment, but may be any low-coherence light source. Specific examples include ASE (Amplified Self-Emission) light sources, ultrashort pulse light sources such as titanium sapphire lasers and SC (Super Continuous) light sources, and SS (Swept Source) light sources. This wavelength band is around 850 nm, but since a light source with a longer wavelength band is used in the case where a deeper part of the object needs to be measured at the expense of longitudinal resolution, it is desirable to select the wavelength band according to the purpose.

[0037]Fiber coupler 101 splits broadband light emitted from light...

no. 2 example

[0063] In the present embodiment, a plurality of synthetic dispersion compensating members including materials 1 and 2 satisfying expression (4) are configured to each have figure 2 Different thicknesses shown.

[0064] The present embodiment can provide dispersion compensating members that appropriately compensate myopia, normal eyes, or hypermetropia, respectively. figure 2 Shown are dispersion compensating members 201 and 202 used for measuring a hyperopic subject, dispersion compensating members 203 and 204 used for measuring a normal-eyed subject having a normal axial length, and dispersion compensating members 203 and 204 used for measuring myopia The dispersion compensating members 205 and 206 are used when the subject is an eye. More specifically, this example uses the conditions listed in Table 1 below.

[0065] Table 1

[0066] polycarbonate

Thickness (mm)

BK7

Thickness (mm)

201

1.7

202

23

203

2

...

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Abstract

The invention provides an optical coherence tomography apparatus. Measuring light with a wide wavelength band is used to provide a tomographic image excellent in vertical resolution. An optical coherence tomography apparatus acquiring a tomographic image of an object to be inspected based on an interference light obtained by causing a return light from a measuring light emitted onto the object to be inspected to interfere with a reference light corresponding to the measuring light, includes: a first dispersion compensation unit having a first dispersion compensation characteristic in a wavelength band of the measuring light; a second dispersion compensation unit provided onto the first dispersion compensation unit and having a second dispersion compensation characteristic in the wavelength band of the measuring light.

Description

technical field [0001] The present invention relates to an optical coherence tomography imaging apparatus and a method thereof, and more particularly to an optical coherence tomography imaging apparatus and a method thereof for imaging a section of a fundus and skin. Background technique [0002] In recent years, an optical coherence tomography (hereinafter referred to as OCT) apparatus using an optical coherence technique of low-coherence light has been put into practical use. OCT devices are useful devices in the medical field, especially in the field of ophthalmology. The OCT device can provide a tomographic image of the retinal portion of the fundus, and is becoming indispensable for disease diagnosis of the fundus portion. [0003] Here, the principle of OCT will be briefly explained. Divide low-correlation light into reference light and measurement light. The measurement light enters the subject and is reflected on the tomographic imaging area. The reflected return...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/14A61B3/12A61B5/00
CPCA61B3/102A61B5/0066A61B3/12G01N21/45
Inventor 黑坂亮治
Owner CANON KK
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