Optical coherence tomography method, system and computer program product therefor

Optical retinal imaging system, comprising

• an optical retinal imaging apparatus including a radiation source for providing a beam of imaging radiation, an optical receiver for receiving a reflected portion of the imaging radiation, and an analyzer for analyzing the received reflected portion of the imaging radiation;
• the optical retinal imaging system further comprising
• directing optics for directing the beam of imaging radiation towards a fundus of a human or animal eye, a tracking camera for providing a plurality of subsequent tracking images wherein each tracking image is obtained by the tracking camera at once within an exposure time, the tracking images including an image area covering at least a part of said fundus, and a controller for receiving the tracking images and analyzing each tracking image by comparing with one or more earlier images for detecting a displacement of the fundus during irradiation thereof by the optical retinal imaging apparatus;
• wherein the directing optics include:
• an optical corrector operatively connected to the controller for enabling adapting of a direction of the beam of imaging radiation at least dependent on the detected displacement, by actuation of the optical corrector;
• and
• a camera image corrector for adapting, in addition to said adapting of the direction of the beam of imaging radiation, a location of the image area on said fundus imaged by the tracking camera at least dependent on the detected displacement.

A non-transitory computer readable medium comprising a computer program product comprising instructions that, when executed by an optical retinal imaging system causes the system to perform a method comprising:

• controlling a radiation source of an optical retinal imaging apparatus comprised by the system to provide a beam of imaging radiation;
• and controlling directing optics to direct the beam of imaging radiation towards a fundus of a human or animal eye;
• and controlling the optical retinal imaging apparatus receive a reflected portion of the imaging radiation;
• the method further comprises:
• controlling a tracking camera to provide a plurality of subsequent tracking images wherein each of the tracking images is obtained by the tracking camera at once within an exposure time, the tracking images including an image area covering at least a part of said fundus;
• and obtaining and analyzing each of the tracking images by a controller by comparing with one or more earlier images for detecting a displacement of the fundus;
• and
• adapting, at least dependent on the detected displacement, a direction of the beam of imaging radiation by actuating an optical corrector of said direction optics;
• and
• in addition to said adapting of the direction of the beam of imaging radiation, adapting a location of the image area on said fundus imaged by the tracking camera at least dependent on the detected displacement.