21 February 2008 Artifact removal in Fourier-domain OCT with a rotating probe
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Proceedings Volume 6851, Endoscopic Microscopy III; 68510G (2008) https://doi.org/10.1117/12.761811
Event: SPIE BiOS, 2008, San Jose, California, United States
This paper reports the study of a Swept Source Optical Coherence Tomography (SS-OCT) setup to remove depth degeneracy for measurements performed with a rotating probe. One of the main drawbacks of SS-OCT is its inability to differentiate positive and negative depths. Some setups have already been proposed to remove this depth ambiguity by introducing a modulation by means of electro-optic or acousto-optic modulators. For cross-sectional imaging, we developed a setup that uses a piezoelectric fiber stretcher to generate a periodic phase shift between successive A-scans, thus introducing a transverse modulation. The depth ambiguity is then resolved by performing a Fourier processing in the transverse direction before processing the data in the axial direction. This approach can also be applied to a rotating probe with a cylindrical geometry by introducing phase shifts between A-scans belonging to successive rotations or between successive B-scans. In the later case, the depth degeneracy is removed by first performing a Fourier processing along the cylindrical axis. We validate this approach by processing images acquired with our catheterized probe based on a rotating fiber and fitted with a GRIN lens and a prism at the tip.
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Sébastien Vergnole, Guy Lamouche, Marc L. Dufour, Bruno Gauthier, Christian Padioleau, "Artifact removal in Fourier-domain OCT with a rotating probe", Proc. SPIE 6851, Endoscopic Microscopy III, 68510G (21 February 2008); doi: 10.1117/12.761811; https://doi.org/10.1117/12.761811

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