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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 22 — Oct. 22, 2012
  • pp: 24925–24948

An advanced algorithm for dispersion encoded full range frequency domain optical coherence tomography

Felix Köttig, Peter Cimalla, Maria Gärtner, and Edmund Koch  »View Author Affiliations

Optics Express, Vol. 20, Issue 22, pp. 24925-24948 (2012)

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Dispersion encoded full range (DEFR) optical coherence tomography (OCT) has become highly attractive as it is a simple way to increase the measurement range of OCT systems. Full range OCT is especially favorable as it does not only increase the measurement range but also shifts the highest sensitivity into the center of the measurement range. While the early versions of DEFR were highly computational expensive, new versions reduce the number of necessary Fourier transforms. Recently it has been shown that a GPU based algorithm can perform DEFR with more than 20,000 A-lines per second. We present a new version of the DEFR algorithm that requires only one Fourier transform per A-scan and uses convolution in z-space instead of multiplication in k-space, therefore reducing the computational effort considerably. While dispersion encoding has so far only been used to suppress mirror artifacts, we show that, with dispersion encoding and only one more Fourier transform, autocorrelation terms can be removed likewise. Since very high values of dispersion reduce the effective measurement range in dispersion encoded OCT, we present an estimate for a sufficient amount of dispersion for a successful image recovery, which is depending on the thickness of the scattering layers. Furthermore, we demonstrate the usability of ZnSe as a new dispersive material with a very high dispersion and describe a simple method to extract the dispersive phase from the measurement of a single reflex of a glass surface. Using a standard consumer PC, an artifact-free recovery of 1000 – 2000 A-scans per second with 2048 depth values including autocorrelation removal was achieved. The dynamic range (sensitivity) is not reduced and the suppression ratio of mirror artifacts and autocorrelation signals is more than 50dB using ZnSe.

© 2012 OSA

OCIS Codes
(100.3020) Image processing : Image reconstruction-restoration
(100.5070) Image processing : Phase retrieval
(110.0110) Imaging systems : Imaging systems
(110.4500) Imaging systems : Optical coherence tomography
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(170.3010) Medical optics and biotechnology : Image reconstruction techniques
(170.4500) Medical optics and biotechnology : Optical coherence tomography
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
(110.3010) Imaging systems : Image reconstruction techniques

ToC Category:
Image Processing

Original Manuscript: August 28, 2012
Revised Manuscript: October 8, 2012
Manuscript Accepted: October 9, 2012
Published: October 16, 2012

Felix Köttig, Peter Cimalla, Maria Gärtner, and Edmund Koch, "An advanced algorithm for dispersion encoded full range frequency domain optical coherence tomography," Opt. Express 20, 24925-24948 (2012)

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