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B. Braaf, V. A. D. P. Sicam, K. A. Vermeer, J. F. de Boer; Imaging of the Human Retina and Choroid With Optical Coherence Tomography at 1050 nm Combined With Active Tracking. Invest. Ophthalmol. Vis. Sci. 2010;51(13):2288.
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© ARVO (1962-2015); The Authors (2016-present)
To reduce motion artifacts and speckle noise in deep penetration images of the human retina and choroid by Optical Frequency Domain Imaging (OFDI) at 1050 nm.
A high-speed (30k Hz) OFDI system operated at a center wavelength of 1050 nm is combined with an active retinal tracking system at 910 nm for lateral motion artifact free image acquisition of the human retina and choroid. Cross-sectional images taken at the same location are overlapped and averaged in post-processing to reduce the contribution of speckle noise. The amount of noise in the resulting averaged cross-sectional image is further quantified by the standard deviation of the signal intensity from areas in the vitreous.
Image averaging decreases the overall noise in the OFDI cross-sectional image with a factor of 1.5 when 2 images are used. Increasing the amount of images in the averaging process consequently increases the reduction in noise to a factor of 2.1 for 4 images and 2.4 for 8 images.
The use of retinal tracking in optical coherence tomography enables image averaging for the reduction of speckle noise present in acquired OFDI cross-sectional images.
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