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Related Concept Videos

IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
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IR Frequency Region: X–H Stretching

In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in the 3500–3100 cm−1 range. Even though both O−H and N−H bonds vibrate at a similar...
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Total Internal Reflection Fluorescence Microscopy01:05

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Dispersion encoded full range frequency domain optical coherence tomography.

Bernd Hofer1, Boris Povazay, Boris Hermann

  • 1Biomedical Imaging Group, School of Optometry and Vision Sciences, Cardiff University, Maindy Road, Cardiff, United Kingdom.

Optics Express
|January 9, 2009
PubMed
Summary
This summary is machine-generated.

A new Dispersion Encoded Full Range (DEFR) OCT method effectively cancels complex conjugate artifacts in optical coherence tomography scans. This technique generates full range tomograms without compromising acquisition speed or resolution.

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Area of Science:

  • Biomedical Optics
  • Medical Imaging
  • Optical Engineering

Background:

  • Frequency-domain optical coherence tomography (FD-OCT) suffers from complex conjugate mirror artifacts.
  • These artifacts obscure true sample structures in tomographic reconstructions.
  • Existing methods often require additional scans or compromise acquisition speed.

Purpose of the Study:

  • To introduce a novel algorithm, Dispersion Encoded Full Range (DEFR) OCT, for effective cancellation of complex conjugate mirror terms.
  • To enable the generation of full range tomograms from individual A-scans.
  • To improve the robustness and diagnostic accuracy of FD-OCT.

Main Methods:

  • An iterative algorithm exploiting dispersion mismatch between reference and sample arms.
  • Numerical dispersion compensation for enhanced image quality.
  • Incorporation of light source power spectrum for residual mirror term reduction.

Main Results:

  • Achieved effective cancellation of complex conjugate mirror terms in individual A-scans.
  • Generated full range tomograms distinguishing real structures from artifacts.
  • Demonstrated mirror signal suppression ratio exceeding 50 dB.
  • Maintained acquisition speed and comparable resolution to standard FD-OCT processing.

Conclusions:

  • DEFR-OCT provides a robust and efficient method for full range tomogram generation in FD-OCT.
  • The technique effectively suppresses complex conjugate artifacts without compromising imaging speed.
  • DEFR-OCT offers a significant advancement for artifact reduction in optical coherence tomography.