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Theoretical Analysis of Complex-Conjugate-Ambiguity Suppression in Frequency-Domain Optical-Coherence Tomography

S.C. Sekhar, R. Michaely, R.A. Leitgeb, M. Unser

Proceedings of the Fifth IEEE International Symposium on Biomedical Imaging: From Nano to Macro (ISBI'08), Paris, French Republic, May 14-17, 2008, pp. 396-399.

New phase-shifting techniques have recently been proposed to suppress the complex-conjugate ambiguity in frequency-domain optical-coherence tomography. A phase shift is introduced, in an elegant fashion, by incorporating a small beam offset at the scanning mirror. The tomogram is then computed by using a combination of Hilbert and Fourier transforms. This is a marked deviation from the conventional approaches, wherein each A-scan is reconstructed independently of the others. In this paper, we formulate the problem in a signal processing framework and provide theoretical proofs for maximal and partial suppression of complex-conjugate ambiguity. To supplement the theoretical derivations, we provide experimental results on in vivo measurements of a human finger nail.

AUTHOR="Sekhar, S.C. and Michaely, R. and Leitgeb, R.A. and Unser, M.",
TITLE="Theoretical Analysis of Complex-Conjugate-Ambiguity Suppression
        in Frequency-Domain Optical-Coherence Tomography",
BOOKTITLE="Proceedings of the Fifth {IEEE} International Symposium on
        Biomedical Imaging: {F}rom Nano to Macro ({ISBI'08})",
address="Paris, French Republic",
month="May 14-17,",

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