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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 6, Iss. 4 — May. 4, 2011

Full-range k-domain linearization in spectral-domain optical coherence tomography

Mansik Jeon, Jeehyun Kim, Unsang Jung, Changho Lee, Woonggyu Jung, and Stephen A. Boppart  »View Author Affiliations


Applied Optics, Vol. 50, Issue 8, pp. 1158-1163 (2011)
http://dx.doi.org/10.1364/AO.50.001158


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Abstract

A full-bandwidth k-domain linearization method for spectral-domain optical coherence tomography (SD-OCT) is demonstrated. The method uses information of the wavenumber–pixel-position provided by a translating-slit-based wavelength filter. For calibration purposes, the filter is placed either after a broadband source or at the end of the sample path, and the filtered spectrum with a narrowed line width ( 0.5 nm ) is incident on a line-scan camera in the detection path. The wavelength-swept spectra are co-registered with the pixel positions according to their central wavelengths, which can be automatically measured with an optical spectrum analyzer. For imaging, the method does not require a filter or a software recalibration algorithm; it simply resamples the OCT signal from the detector array without employing rescaling or interpolation methods. The accuracy of k-linearization is maximized by increasing the k-linearization order, which is known to be a crucial parameter for maintaining a narrow point-spread function (PSF) width at increasing depths. The broadening effect is studied by changing the k-linearization order by undersampling to search for the optimal value. The system provides more position information, surpassing the optimum without compromising the imaging speed. The proposed full-range k-domain linearization method can be applied to SD-OCT systems to simplify their hardware/software, increase their speed, and improve the axial image resolution. The experimentally measured width of PSF in air has an FWHM of 8 μm at the edge of the axial measurement range. At an imaging depth of 2.5 mm , the sensitivity of the full-range calibration case drops less than 10 dB compared with the uncompensated case.

© 2011 Optical Society of America

OCIS Codes
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.4500) Medical optics and biotechnology : Optical coherence tomography

ToC Category:
Optical Coherence Tomography

History
Original Manuscript: October 22, 2010
Revised Manuscript: January 17, 2011
Manuscript Accepted: January 17, 2011
Published: March 8, 2011

Virtual Issues
Vol. 6, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Mansik Jeon, Jeehyun Kim, Unsang Jung, Changho Lee, Woonggyu Jung, and Stephen A. Boppart, "Full-range k-domain linearization in spectral-domain optical coherence tomography," Appl. Opt. 50, 1158-1163 (2011)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-50-8-1158


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