Increasing signal-to-noise ratio of swept-source optical coherence tomography by oversampling in k-space

Karim Nagib; Biniyam Mezgebo; Rahul Thakur; Namal Fernando; Behzad Kordi; Sherif Sherif

doi:10.1117/12.2283015

5 March 2018 Increasing signal-to-noise ratio of swept-source optical coherence tomography by oversampling in k-space

Karim Nagib, Biniyam Mezgebo, Rahul Thakur, Namal Fernando, Behzad Kordi, Sherif Sherif

Proceedings Volume 10591, 2nd Canterbury Conference on OCT with Emphasis on Broadband Optical Sources; 105910R (2018) https://doi.org/10.1117/12.2283015
Event: Second Canterbury Conference on Optical Coherence Tomography, 2017, Canterbury, United Kingdom

Abstract

Optical coherence tomography systems suffer from noise that could reduce ability to interpret reconstructed images correctly. We describe a method to increase the signal-to-noise ratio of swept-source optical coherence tomography (SSOCT) using oversampling in k-space. Due to this oversampling, information redundancy would be introduced in the measured interferogram that could be used to reduce white noise in the reconstructed A-scan. We applied our novel scaled nonuniform discrete Fourier transform to oversampled SS-OCT interferograms to reconstruct images of a salamander egg. The peak-signal-to-noise (PSNR) between the reconstructed images using interferograms sampled at 250MS/s andz50MS/s demonstrate that this oversampling increased the signal-to-noise ratio by 25.22 dB.

Citation Download Citation

Karim Nagib, Biniyam Mezgebo, Rahul Thakur, Namal Fernando, Behzad Kordi, and Sherif Sherif "Increasing signal-to-noise ratio of swept-source optical coherence tomography by oversampling in k-space", Proc. SPIE 10591, 2nd Canterbury Conference on OCT with Emphasis on Broadband Optical Sources, 105910R (5 March 2018); https://doi.org/10.1117/12.2283015

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