Dual-beam angular compounding for speckle reduction in optical coherence tomography

Wei Cheng; Jie Qian; Zhaoyuan Cao; Xinjian Chen; Jianhua Mo

doi:10.1117/12.2254270

17 February 2017 Dual-beam angular compounding for speckle reduction in optical coherence tomography

Wei Cheng, Jie Qian, Zhaoyuan Cao, Xinjian Chen, Jianhua Mo

Proceedings Volume 10053, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXI; 100532Z (2017) https://doi.org/10.1117/12.2254270
Event: SPIE BiOS, 2017, San Francisco, California, United States

Abstract

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.

Citation Download Citation

Wei Cheng, Jie Qian, Zhaoyuan Cao, Xinjian Chen, and 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); https://doi.org/10.1117/12.2254270

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