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Updated: Jul 8, 2026

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
Published on: January 15, 2013
Statistics of the depth-scan photocurrent in time-domain optical coherence tomography
Sherif S Sherif1, Carla C Rosa, Costel Flueraru
1Institute for Microstructural Sciences, National Research Council Canada, 1200 Montreal Road, Ottawa, K1A 0R6, Canada. Sherif.Sherif@nrc.ca
Abstract:
We derive the time-variant second-order statistics of the depth-scan photocurrent in time-domain optical coherence tomography (TD-OCT) systems using polarized thermal light sources and superluminescent diodes (SLDs). Since the asymptotic-joint-probability-distribution function (JPDF) of the photocurrent due to polarized thermal light is Gaussian and the signal-noise-ratio in TD-OCT is typically high (>80 dB), the JPDF of the depth-scan photocurrent could be approximated as a Gaussian random process that is completely determined by its second-order statistics. We analyze both direct and differential light detection schemes and include the effect of electronic thermal fluctuations. Our results are a necessary prerequisite for future development of statistical image processing techniques for TD-OCT.
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