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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Single-fiber diffuse optical time-of-flight spectroscopy.

Erik Alerstam1, Tomas Svensson, Stefan Andersson-Engels

  • 1Department of Physics, Lund University, P.O. Box 118, 221 00 Lund, Sweden. erik.alerstam@fysik.lth.se

Optics Letters
|July 25, 2012
PubMed
Summary

This study introduces a novel single-fiber diffuse optical spectroscopy technique. It accurately measures tissue absorption independently of scattering, enabling simpler, less invasive in vivo measurements.

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Area of Science:

  • Biomedical Optics
  • Spectroscopy
  • Medical Physics

Background:

  • Interstitial diffuse optical spectroscopy offers potential for in vivo tissue analysis.
  • Current methods face challenges with scattering, absorption, and complex instrumentation.

Purpose of the Study:

  • To develop and validate a simplified interstitial diffuse optical time-of-flight spectroscopy system.
  • To demonstrate the independent assessment of tissue absorption and scattering properties.

Main Methods:

  • Utilized a single fiber for both light delivery and detection.
  • Employed ultrafast gating of a single photon avalanche diode to prevent detector saturation.
  • Performed measurements on calibrated liquid phantoms.
  • Conducted Monte Carlo-based evaluation for data analysis.

Main Results:

  • Successfully separated scattering and absorption effects in optical measurements.
  • Demonstrated accurate assessment of absorption coefficients independent of scattering.
  • Validated the technique across a range of medically relevant optical properties.

Conclusions:

  • The developed single-fiber spectroscopy system simplifies interstitial optical measurements.
  • This technique enables accurate, independent assessment of tissue absorption in vivo.
  • Paves the way for less invasive spectroscopic diagnostics.