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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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Pathlength-selective, interferometric diffuse correlation spectroscopy.

Mitchell B Robinson1, Marco Renna1, Nikola Otic2

  • 1Athinoula A. Martinos Center for Biomedical Imaging Department of Radiology, Massachusetts General Hospital, Harvard Medical School, USA.

IEEE Journal of Selected Topics in Quantum Electronics : a Publication of the IEEE Lasers and Electro-Optics Society
|August 6, 2025
PubMed
Summary
This summary is machine-generated.

We developed pathlength-selective, interferometric diffuse correlation spectroscopy (PaLS-iDCS) for enhanced deep tissue blood flow monitoring. This non-invasive method improves signal-to-noise ratio and sensitivity to deep hemodynamics without complex equipment.

Keywords:
Biomedical applications of optical radiationhemodynamicsoptical interferometry

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Area of Science:

  • Biomedical Optics
  • Medical Imaging
  • Photonics

Background:

  • Diffuse Correlation Spectroscopy (DCS) is crucial for non-invasive blood flow monitoring.
  • Standard DCS methods have limitations in sensitivity to deep tissue hemodynamics and signal-to-noise ratio (SNR).
  • Existing enhanced DCS techniques like time-domain DCS (TD-DCS) offer time-of-flight (ToF) resolution but can be complex.

Purpose of the Study:

  • To introduce and validate an enhanced DCS method, pathlength-selective, interferometric DCS (PaLS-iDCS).
  • To improve sensitivity to deep tissue hemodynamics and measurement SNR.
  • To provide ToF-specific blood flow information without expensive time-tagging electronics.

Main Methods:

  • Development of PaLS-iDCS utilizing pathlength-specific coherent gain and interferometric detection.
  • Comparison with TD-DCS using Monte Carlo simulations, phantom experiments, and human subject measurements.
  • Analysis of SNR, sensitivity to deep tissue hemodynamics, and optical property estimation.

Main Results:

  • PaLS-iDCS demonstrated over a 2x improvement in SNR compared to TD-DCS for similar ToF measurements.
  • SNR improvements enabled measurements at extended photon ToFs, increasing sensitivity to deep hemodynamics by approximately 50%.
  • PaLS-iDCS allows direct estimation of tissue optical properties from the ToF distribution.

Conclusions:

  • PaLS-iDCS offers a robust, non-invasive method for blood flow measurements with enhanced sensitivity to deep tissue hemodynamics.
  • The technique provides ToF-specific blood flow data without requiring time-resolved detection.
  • PaLS-iDCS presents a significant advancement for DCS applications in deep tissue monitoring.