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Proceedings Paper

Chirp optical coherence tomography with high resolution and artifact reduction using tunable near-infrared laser
Author(s): Dominik Hoelscher; Udo Haberland; Daniel Pieknick; Vladimir Blazek
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Paper Abstract

Chirp optical coherence tomography (C-OCT) has become an alternative solution for imaging scattering media. This technique uses frequency modulated laser sources without a mechanical moving reference mirror as it is necessary in conventional coherence tomography. Images of scattering phantoms using an electrically tunable laser diode with a spatial resolution of about 400 micrometer in air had shown the capability of this tomographic principle. The new setup contains an External Cavity Laser (ECL) with a center wavelength of 780 nm. Due to the wide usable tuning range of the ECL an improved spatial resolution could be obtained compared with the electrically tunable laser diode. Having only one reflection in the object the wide bandwidth of the ECL yields a peak with the full width at half maximum less than 20 micrometers. Images of phantoms with known dimensions and scattering properties made with this arrangement are presented. Measurement of movement and motion artifacts demands special frequency modulation of the light source. Suitable methods to obtain useful information like location and velocity of moving objects as well as reducing artifacts are proposed. Combining C-OCT with Laser Doppler Perfusion Imaging (LDPI) requires conveniently prepared sweep functions.

Paper Details

Date Published: 24 April 1998
PDF: 8 pages
Proc. SPIE 3251, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications II, (24 April 1998); doi: 10.1117/12.306041
Show Author Affiliations
Dominik Hoelscher, Rheinsich-Westfaelische Technische Hochschule Aachen (Germany)
Udo Haberland, Technical Univ. of Aachen (Germany)
Daniel Pieknick, Technical Univ. of Aachen (Germany)
Vladimir Blazek, Technical Univ. of Aachen (Germany)

Published in SPIE Proceedings Vol. 3251:
Coherence Domain Optical Methods in Biomedical Science and Clinical Applications II
Valery V. Tuchin; Joseph A. Izatt, Editor(s)

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