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Harihar Narasimha-Iyer, Michal Laron, Mary K Durbin, Sowmya Srinivas, Srinivas R Sadda, Giovanni Gregori, Philip J Rosenfeld; Widefield Imaging of the retina using Swept Source OCT. Invest. Ophthalmol. Vis. Sci. 2014;55(13):1617.
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© ARVO (1962-2015); The Authors (2016-present)
To obtain OCT images with field of view greater than possible with individual OCT cube scans.
Ten eyes including normal eyes and eyes with different retinal pathologies were imaged using a custom prototype swept source OCT system. The system supported acquisition of 12mmx9mmx3mm cube OCT scans. In one protocol, the subjects were asked to fixate centrally and then at a position temporal from the central location. In another protocol, the subjects were asked to fixate on fixation locations superior and inferior to the fovea. The fixation locations were chosen such that there was some overlap between the OCT scan regions for the two scans. The corresponding pair of OCT scans were then registered using custom software and information available from both of the scans.
OCT images with a field of view of ~19mmx10mmx4.5mm and ~12mmx13.5mmx4.5mm were obtained allowing visualization of widefield OCT B-Scans. Using the same registration software, we generated widefield retinal thickness maps as well as OCT slab images to better visualize the retinal anatomy and pathologies. An example is shown in Figure 1, showing peripheral lesions.
Methods have been described to obtain OCT scans with wide field of view by combining multiple OCT cube scans. The combined image allows visualization of OCT features over a larger field of view than previously available, showing peripheral anatomy and putting macular observations into a more complete anatomical context.
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