Dual Beam Optical Coherence Imaging System

Korea University Background
Conventional optical coherence imaging systems need to resolve the effects of eye movements

Angiography is very sensitive to eye movement because it uses the degree of a stigmatism between retinal images in the same area.
The conventional technique has a disadvantage in that the time difference between each scanning and the difference in speed between the fast and slow scanning direction axes lowers the accuracy of the image.

Technology Overview
4f system placed in optical path between 1/2 lambda plates:

By measuring the correlation between the image images obtained during scanning, it is possible to detect the movement of the subject and correct the image accurately.
Optimized image can be acquired by blocking image disturbance or noise caused by eye movement – Scanning in the Y-axis simultaneously while scanning the reflected light along the X-axis, simultaneously acquiring two-dimensional XZ-plane images and YZ- plane images ().

Polarization Controller that maximizes the intensity of light and keeps the distribution of light in Gaussian form ():

A collimator for keeping the emitted light as parallel light
A light source that generates light in the broadband and an optical fiber that transmits the light in the broadband without loss
A balanced photodetector (BPD) for detecting an interference signal of light.

Dual beam optical coherence imaging system that can obtain different images in vertical direction with one scanning:

4f system prevents the scanning range from being attenuated without being restricted by the focal length.
During the scanning, the motion of the subject is recognized and the image is corrected.

Benefits
A technique of photographing and averaging a plurality of 3D images:
Possible to shorten the imaging time and to optimize the effect of the burden of the patient at the time of shooting and the movement of the eyeball.
Adjusting the optical length of horizontal polarization and the optical length of vertical polarization:
Possible to acquire two images without overlapping by adjusting the optical length of each polarized light image obtained by one image shooting.
Applications

The present invention is applied to the optical medical device industry which implements microstructure inside biotissue by combining optical interference phenomenon and confocal microscopy principle.
By 2018, the market for global optical medical devices is valued at USD $ 1.8 billion and CACR is expected to exceed 8%.
As vascular diseases such as eye diseases and cerebrovascular diseases increase rapidly, it is required to develop optical medical technology which is free from the risk of radiation examination.

Opportunity
– Built in laboratory environment.

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