JP2015117978A5 - - Google Patents

Description

One of the optical coherence tomographs according to the present invention is :
A light source unit for changing the wavelength of the emitted light;
An interference optical system that demultiplexes the light from the light source unit onto the object and the reference light, and generates reflected light of the light applied to the object and interference light from the reference light;
A light detector that receives the interference light;
Using light emitted from the light source unit, and a clock generator for generating a plurality of clock signals of mutually different positions phases,
An optical coherence tomograph having
An information acquisition unit that samples the intensity of the interference light obtained at the same position on the object using the plurality of clock signals , and acquires information on the object using the plurality of interference signals obtained by the sampling. When,
That it has a.

Claims (22)

A light source unit for changing the wavelength of the emitted light;
An interference optical system that demultiplexes the light from the light source unit onto the object and the reference light, and generates reflected light of the light applied to the object and interference light from the reference light;
A light detector that receives the interference light;
Using light emitted from the light source unit, and a clock generator for generating a plurality of clock signals of mutually different positions phases,
An optical coherence tomograph having
An information acquisition unit that samples the intensity of the interference light obtained at the same position on the object using the plurality of clock signals , and acquires information on the object using the plurality of interference signals obtained by the sampling. When,
Optical coherence tomography that have a. The clock generation unit generates the clock signal at a wave number interval of n × Δk, where n is a natural number and the wave number of light is Δk,
The information acquisition unit acquires n interference signals at the same position on the object based on the clock signal,
The optical coherence tomometer according to claim 1, wherein sampling frequencies of the acquired n interference signals are different from each other by Δk. The information acquisition unit, prior to acquiring a plurality of tomographic images by using a plurality of interference signals obtained by hexa sampling, claim 1 of acquiring a tomographic image of the object by synthesizing a plurality of tomographic images Or the optical coherence tomography according to 2. The information acquisition unit, prior to combining the plurality of interference signals obtained by hexa sampling, light as claimed in any one of claims 1 to 3 using the combined data for obtaining a tomographic image of the object Coherence tomography.   The optical coherence tomography further includes a scanning mirror that changes an irradiation position of the irradiation light on the object, and acquires information on a tomographic plane of the object by changing the irradiation position of the irradiation light by the scanning mirror. The optical coherence tomometer according to claim 1, comprising a configuration for   The optical coherence tomometer according to claim 5, wherein after the plurality of pieces of information on the object are acquired at the same position on the object, the irradiation position of the irradiation light is changed using the scanning mirror.   The information of the object is acquired once at the same position of the object, and then scanning is performed by changing the irradiation position of the irradiation light using the scanning mirror, and the same scanning process is repeated a plurality of times. Optical coherence tomography. A light source unit that generates light having a wavelength changed;
In the process of changing the wavelength, a clock generation unit that generates a clock signal that alternately repeats rising and falling at a timing when the wave number of the light changes by a predetermined change amount; and
A first sampling data string obtained by sampling the intensity of interference light between reflected light obtained by reflecting the light from an object and reference light corresponding to the light at a rising timing of the clock signal; and the clock An information acquisition unit that acquires information on the object based on a second sampling data sequence obtained by sampling at a signal falling timing;
Optical coherence tomography. The optical coherence tomometer according to claim 8, wherein the information acquisition unit performs sampling at the rising timing and the falling timing by sampling at a rising timing or a falling timing of clock signals having different phases. . The information acquisition unit performs sampling at the rising timing and the falling timing by sampling at the timing of the rising zero crossing point or the falling zero crossing point of the clock signals having different phases. Item 10. The optical coherence tomography according to Item 8 or 9. The information acquisition unit creates an integrated sampling data sequence in which the first sampling data sequence and the second sampling data sequence are arranged in a nested manner, and performs a discrete Fourier transform process on the integrated sampling data sequence, and the object The optical coherence tomography according to any one of claims 8 to 10, wherein tomographic image data is generated as the information. The information acquisition unit combines the first intermediate data obtained through a discrete Fourier transform process on the first sampling data sequence and the second intermediate data obtained through a discrete Fourier transform process on the second sampling data sequence The optical coherence tomography according to claim 8, wherein tomographic image data is generated as information on the object to be processed. The clock generator generates a plurality of clock signals including a clock signal passing through a path provided with a differentiating circuit and a clock signal passing through a path not provided with the differentiating circuit. The optical coherence tomography device according to any one of claims 1 to 12, wherein a clock signal is generated. As a path through which the clock signal passes, a switch that switches between a path provided with the differentiating circuit and a path not provided with the differentiating circuit;
The information acquisition unit includes one analog-to-digital conversion element that samples the intensity of the interference light using the plurality of clock signals;
The optical coherence tomograph according to claim 13, further comprising: The optical coherence tomography, the optical coherence tomography according to any one of claims 1 to 14 further comprising a measurement unit for measuring a wavenumber or wavelength of the clock signal. The optical coherence tomography device according to any one of claims 1 to 15 , wherein the object is a living body. The optical coherence tomography device according to claim 16 , wherein the living body is an eyeball. The optical coherence tomography device according to claim 16 , wherein the living body is a blood vessel. Optical coherence tomography according to any one of claims 1 to 1 8 wherein the light source unit is a surface-emitting laser. Receiving interference light by reflected light and reference light of irradiation light that irradiates an object with light from a light source unit that changes the wavelength of emitted light; and
Using the light emitted from the light source unit to generate a plurality of clock signals having different phases;
Sampling the interference light intensity obtained at the same position on the object using the plurality of clock signals;
Obtaining information of the object using a plurality of interference signals obtained by sampling;
An optical coherence tomography method. Generating light whose wavelength is changed;
In the process of changing the wavelength, generating a clock signal that alternately repeats rising and falling at the timing when the wave number of the light changes by a predetermined change amount; and
A first sampling data string obtained by sampling the intensity of interference light between reflected light obtained by reflecting the light from an object and reference light corresponding to the light at a rising timing of the clock signal; and the clock Obtaining the information of the object based on a second sampling data sequence obtained by sampling at the timing of signal fall;
An optical coherence tomography method. The program which makes a computer perform each process of the optical coherence tomography method of Claim 20 or 21.