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Proceedings Paper

Real-time calibration-free C-scan images of the eye fundus using Master Slave swept source optical coherence tomography
Author(s): Adrian Bradu; Konstantin Kapinchev; Fred Barnes; David F. Garway-Heath; Ranjan Rajendram; Pearse Keane; Adrian Gh. Podoleanu
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Paper Abstract

Recently, we introduced a novel Optical Coherence Tomography (OCT) method, termed as Master Slave OCT (MS-OCT), specialized for delivering en-face images. This method uses principles of spectral domain interfereometry in two stages. MS-OCT operates like a time domain OCT, selecting only signals from a chosen depth only while scanning the laser beam across the eye. Time domain OCT allows real time production of an en-face image, although relatively slowly. As a major advance, the Master Slave method allows collection of signals from any number of depths, as required by the user. The tremendous advantage in terms of parallel provision of data from numerous depths could not be fully employed by using multi core processors only. The data processing required to generate images at multiple depths simultaneously is not achievable with commodity multicore processors only. We compare here the major improvement in processing and display, brought about by using graphic cards. We demonstrate images obtained with a swept source at 100 kHz (which determines an acquisition time [Ta] for a frame of 200×200 pixels2 of Ta =1.6 s). By the end of the acquired frame being scanned, using our computing capacity, 4 simultaneous en-face images could be created in T = 0.8 s. We demonstrate that by using graphic cards, 32 en-face images can be displayed in Td 0.3 s. Other faster swept source engines can be used with no difference in terms of Td. With 32 images (or more), volumes can be created for 3D display, using en-face images, as opposed to the current technology where volumes are created using cross section OCT images.

Paper Details

Date Published: 20 March 2015
PDF: 8 pages
Proc. SPIE 9307, Ophthalmic Technologies XXV, 93071C (20 March 2015); doi: 10.1117/12.2078956
Show Author Affiliations
Adrian Bradu, Univ. of Kent (United Kingdom)
Konstantin Kapinchev, Univ. of Kent (United Kingdom)
Fred Barnes, Univ. of Kent (United Kingdom)
David F. Garway-Heath, NIHR Biomedical Research Ctr., Moorfields Eye Hospital (United Kingdom)
Ranjan Rajendram, NIHR Biomedical Research Ctr., Moorfields Eye Hospital (United Kingdom)
Pearse Keane, NIHR Biomedical Research Ctr., Moorfields Eye Hospital (United Kingdom)
Adrian Gh. Podoleanu, Univ. of Kent (United Kingdom)


Published in SPIE Proceedings Vol. 9307:
Ophthalmic Technologies XXV
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)

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