Abstract
The main motivation of the present chapter is to clarify the notions of signal phase in optical coherence tomography (OCT) and to introduce the reader to the problem of phase-sensitive Fourier domain (Fd)OCT detection and complex FdOCT signal formation. The availability of signal phase information due to the coherent signal detection is one of the most important advantages of OCT. A particular advantage of FdOCT is the possibility of having direct access to the spectral fringe pattern, enabling a wide range of novel applications such as tissue absorption measurement and tissue contrast enhancement. Additionally, the high speed combined with simultaneous registration of all spectral components (spectral OCT) provides stable phase information. We discuss the meaning of complex signal content and the implications of complex FdOCT signal reconstruction for cross-sectional image formation. We also demonstrate the potential of phase-sensitive FdOCT techniques for improving the quality of FdOCT reconstructions.
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Acknowledgments
We would like to acknowledge Andrzej Kowalczyk and Maciej Szkulmowski from NCU Torun for their assistance in the theoretical and experimental work on phase-sensitive SOCT. We also gratefully acknowledge helpful advices from Robert Zawadzki from UC Davis; Christoph Hitzenberger, Wolfgang Drexler, Leopold Schmetterer, and Michael Pircher from Medical University of Vienna; and Theo Lasser and Adrian Bachmann from EPFL Lausanne. We also would like to place special acknowledgments to Prof. Adolf Fercher for his scientific contribution and support.
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Leitgeb, R.A., Wojtkowski, M. (2015). Complex and Coherence-Noise Free Fourier Domain Optical Coherence Tomography. In: Drexler, W., Fujimoto, J. (eds) Optical Coherence Tomography. Springer, Cham. https://doi.org/10.1007/978-3-319-06419-2_7
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