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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 12 — Nov. 10, 2009

Transverse motion as a source of noise and reduced correlation of the Doppler phase shift in spectral domain OCT

Julia Walther and Edmund Koch  »View Author Affiliations


Optics Express, Vol. 17, Issue 22, pp. 19698-19713 (2009)
http://dx.doi.org/10.1364/OE.17.019698


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Abstract

Recently, a new phase-resolved Doppler model was presented for spectral domain optical coherence tomography (SD OCT) showing that the linear relation between the axial velocity component of the obliquely moving sample and the phase difference of consecutive A-Scans does not hold true in the presence of a transverse velocity component which is neglected in the widely-used classic Doppler analysis. Besides taking note of the new non-proportional relationship of phase shift and oblique sample motion, it is essential to consider the correlation of the phase shift and its specific characteristic at certain Doppler angles for designing Doppler experiments with SD OCT. A correlation quotient is introduced to quantify the correlation of the backscattering signal in consecutive A-Scans as a function of the oblique sample motion. It was found that at certain velocities and Doppler angles no correlation of the phases of sequential A-Scans exists, even though the signal does not vanish. To indicate how the noise of the Doppler phase shift behaves for oblique movement, the standard deviation is determined as a function of the correlation quotient and the number of complex Doppler data averaged. The detailed theoretical model is validated by using a flow phantom model consisting of a 1% Intralipid flow through a 310 µm capillary. Finally, a short discussion of the presented results and the consequence for performing Doppler experiments is given.

© 2009 OSA

OCIS Codes
(110.4500) Imaging systems : Optical coherence tomography
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(280.2490) Remote sensing and sensors : Flow diagnostics
(110.4153) Imaging systems : Motion estimation and optical flow

ToC Category:
Imaging Systems

History
Original Manuscript: September 3, 2009
Revised Manuscript: October 12, 2009
Manuscript Accepted: October 14, 2009
Published: October 15, 2009

Virtual Issues
Vol. 4, Iss. 12 Virtual Journal for Biomedical Optics

Citation
Julia Walther and Edmund Koch, "Transverse motion as a source of noise and reduced correlation of the Doppler phase shift 
in spectral domain OCT," Opt. Express 17, 19698-19713 (2009)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-17-22-19698


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