OCT system, method of generating OCT image and storage medium

1. A method of generating an optical coherence tomography (OCT) image performed by an OCT system, the method comprising:

obtaining an interference signal for a reference surface;

generating a first image comprising a three-dimensional image of the reference surface from the interference signal for the reference surface;

selecting a first pixel set from pixels on an x-y plane of the three-dimensional image based on strength of the interference signal corresponding to each pixel;

extracting for the first pixel set, differences in relative depth position between a peak point in the three-dimensional image of the reference surface and points other than the peak point in the three-dimensional image of the reference surface;

calculating a coherence gate curvature (CGC) profile by using the differences extracted for the first pixel set; and

generating a CGC fitting curve from the CGC profile.

2. The method of claim 1 , further comprising:

obtaining an interference signal for a sample;

correcting the interference signal for the sample by using the CGC fitting curve; and

generating a second image from the corrected interference signal for the sample.

3. The method of claim 1 , wherein the selecting the first pixel set comprises selecting only a part of the pixels on the x-y plane of the three-dimensional image as the first pixel set.

4. The method of claim 1 , wherein the selecting the first pixel set comprises selecting a part of the pixels on the x-y plane of the three-dimensional image as the first pixel set, based on strength of the interference signal corresponding to each pixel.

5. An OCT system comprising:

an interferometer;

a photodetector;

a processor; and

a storage unit,

wherein the interferometer comprises a light source, a beam splitter, and a reference mirror,

wherein the photodetector is configured to:

receive interference light that is generated by reference light and reflected light, the reference light being generated by a laser beam from the light source being reflected on the reference mirror, the reflected light being generated by the laser beam reflected on a reference surface; and

convert the interference light into an interference signal, and

wherein the processor is configured to:

obtain an interference signal for the reference surface;

generate a first image comprising a three-dimensional image of the reference surface from the interference signal;

select a first pixel set from pixels on an x-y plane of the three-dimensional image based on strength of the interference signal corresponding to each pixel;

extract for the first pixel set, differences in relative depth position between a peak point in the three-dimensional image of the reference surface and points other than the peak point in the three-dimensional image of the reference surface;

calculate a CGC profile by using the differences extracted for the first pixel set; and

generate a CGC fitting curve from the CGC profile.

6. The OCT system of claim 5 , wherein the processor is configured to:

obtain an interference signal for a sample;

correct the interference signal for the sample by using the CGC fitting curve; and

generate a second image from the corrected interference signal for the sample.

7. The OCT system of claim 5 , wherein the processor is configured to, when selecting the first pixel set, select only a part of the pixels on the x-y plane of the three-dimensional image as the first pixel set.

8. The OCT system of claim 5 , wherein the processor is configured to, when selecting the first pixel set, select a part of the pixels on the x-y plane of the three-dimensional image as the first pixel set, based on strength of the interference signal corresponding to each pixel.

9. A computer-readable storage medium that stores program instructions executable by a processor, the program instructions being configured to perform a method when executed by the processor, the method comprising:

obtaining an interference signal for a reference surface;

generating a first image comprising a three-dimensional image of the reference surface from the interference signal;

selecting a first pixel set from pixels on an x-y plane of the three-dimensional image based on strength of the interference signal corresponding to each pixel;

extracting for the first pixel set, differences in relative depth position between a peak point in the three-dimensional image of the reference surface and points other than the peak point in the three-dimensional image of the reference surface;

calculating extracting a CGC profile by using the differences extracted for the first pixel set;

generating a CGC fitting curve from the CGC profile; and

generating a corrected interference signal by correcting the interference signal by using the CGC fitting curve.

10. The computer-readable storage medium of claim 9 , wherein the method further comprises:

obtaining an interference signal for a sample;

correcting the interference signal for the sample by using the CGC fitting curve; and

generating a second image from the corrected interference signal for the sample.

11. The computer-readable storage medium of claim 9 , wherein the selecting the first pixel set comprises selecting only a part of the pixels on the x-y plane of the three-dimensional image as the first pixel set.

12. The computer-readable storage medium of claim 9 , wherein the selecting the first pixel set comprises selecting a part of the pixels on the x-y plane of the three-dimensional image as the first pixel set, based on strength of the interference signal corresponding to each pixel.