17 February 2017 Dual-beam angular compounding for speckle reduction in optical coherence tomography
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Optical coherence tomography (OCT), as a low-coherence interferometric imaging technique, inevitably suffers from speckle noise, which can reduce image quality and signal-to-noise (SNR). In this paper, we present a dual-beam angular compounding method to reduce speckle noise and improve SNR of OCT image. Two separated parallel light beams are created on the sample arm using a 1x2 optical fiber coupler and are focused into samples at different angles. The epi-detection scheme creates three different light path combinations of these two light beams above. The three combinations produce three images in single B-scan, which are completely separated in depth. The three images show uncorrelated speckle patterns and therefore can be averaged to create a new image with reduced speckle noise. Compared to those reported angular and spatial compounding methods, our method retains their advantages, and moreover has a faster imaging speed and keep the transverse resolution. This method was evaluated on human fingertips in vivo. The results demonstrated a good improvement in speckle contrast.
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Wei Cheng, Jie Qian, Zhaoyuan Cao, Xinjian Chen, Jianhua Mo, "Dual-beam angular compounding for speckle reduction in optical coherence tomography", Proc. SPIE 10053, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXI, 100532Z (17 February 2017); doi: 10.1117/12.2254270; https://doi.org/10.1117/12.2254270

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