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Optical coherence tomography for quantitative surface topography.

Sergio Ortiz1, Damian Siedlecki, Laura Remon

  • 1Instituto de Optica Daza de Valdés, Consejo Superior de Investigaciones Científicas,C/Serrano 121, 28006 Madrid, Spain. sortiz@io.cfmac.csic.es

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|December 17, 2009
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Summary
This summary is machine-generated.

Fan distortion in optical coherence tomography (OCT) hinders quantitative measurements. This study quantifies the distortion, proposes a correction algorithm, and validates its use for accurate topographic mapping with OCT systems.

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Area of Science:

  • Optical Engineering
  • Biomedical Imaging
  • Metrology

Background:

  • Fan distortion in optical coherence tomography (OCT) arises from scanning system configurations.
  • This distortion limits the acquisition of precise quantitative topographic data using OCT.

Purpose of the Study:

  • To quantify fan distortion in OCT systems.
  • To evaluate the impact of scanning mirror separation and collimating lens design on fan distortion.
  • To develop and validate a numerical algorithm for correcting fan distortion in OCT.

Main Methods:

  • Computer simulations were employed to quantify fan distortion and its dependencies.
  • A numerical algorithm based on 3-D ray propagation was developed for distortion correction.
  • Experimental validation was performed using a custom time-domain OCT system and samples with known dimensions.

Main Results:

  • The study identified key parameters influencing fan distortion, including scanning mirror separation and collimating lens design.
  • A numerical algorithm effectively corrected residual fan distortion.
  • Experimental results demonstrated that the corrected OCT system can provide accurate topographic measurements.

Conclusions:

  • Fan distortion is a significant challenge in OCT for quantitative topography.
  • The developed numerical algorithm, coupled with proper system calibration, enables accurate topographic measurements using time-domain OCT.
  • This advancement allows OCT devices to function effectively as topographers.