Direct extraction of phase information in differential phase contrast OCT

Markus Sticker; Christoph K. Hitzenberger; Adolf Friedrich Fercher

doi:10.1117/12.431517

4 May 2001 Direct extraction of phase information in differential phase contrast OCT

Markus Sticker, Christoph K. Hitzenberger, Adolf Friedrich Fercher

Proceedings Volume 4241, Saratov Fall Meeting 2000: Optical Technologies in Biophysics and Medicine II; (2001) https://doi.org/10.1117/12.431517
Event: Saratov Fall Meeting 2000, 2001, Saratov, Russian Federation

Abstract

Normal OCT images are based on the intensity of reflected and backscattered light as a function of position in the object. However, the light backscattered from the sample contains additional information, e.g. on polarization, velocity, and absorption, which can be used to enhance image contrast and to perform quantitative measurements. In differential phase contrast OCT (DPC-OCT) subwavelength phase retardation variations between transversally adjacent positions are imaged, which are not detectable in normal OCT. In earlier versions of this technique, phase differences were calculated from the amplitudes of the A- scan envelopes recorded by two orthogonal polarization channels in the detection unit, as in polarization sensitive OCT. The drawback of that method was its sensitivity to locally varying reflection coefficients and to scattering. We now present an improved method to analyze the phase difference in DPC-OCT. This method is based on recording the whole interferometric signal rather than only its envelope, and on analyzing its phase function.

Citation Download Citation

Markus Sticker, Christoph K. Hitzenberger, and Adolf Friedrich Fercher "Direct extraction of phase information in differential phase contrast OCT", Proc. SPIE 4241, Saratov Fall Meeting 2000: Optical Technologies in Biophysics and Medicine II, (4 May 2001); https://doi.org/10.1117/12.431517

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