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Multimodal imaging that includes optical coherence tomography and a secondary imaging modality in small single-channel endoscopes is often implemented using double-clad fiber (DCF). Unfortunately, the properties of DCF cladding modes generate multipath OCT artifacts degrading image quality. Curiously, the en face mean intensity projection of these multipath artifacts is a high quality image. The differential scattering of en face projections from the image and artifact could be used as an additional imaging modality, sensitive to sub-resolution features. Multipath artifacts are inherent to DCF-based OCT, meaning a wealth of previously acquired data could be explored using this technique.
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