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Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells
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Time-domain diffuse correlation spectroscopy.

Jason Sutin1, Bernhard Zimmerman1, Danil Tyulmankov1

  • 1Optics Division at the Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts 02129, USA.

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|December 24, 2016
PubMed
Summary
This summary is machine-generated.

A new time-domain diffuse correlation spectroscopy (TD-DCS) method improves non-invasive brain blood flow monitoring. This technology overcomes limitations of existing methods, enabling more accurate assessment of oxygen delivery for patients at risk of brain injury.

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Area of Science:

  • Biomedical optics
  • Neuroscience
  • Medical instrumentation

Background:

  • Physiological monitoring of brain oxygen delivery is crucial for managing patients at risk of brain injury.
  • Diffuse correlation spectroscopy (DCS) non-invasively measures blood flow index (BFi) but faces challenges with extracerebral contamination and unknown tissue optical properties.

Purpose of the Study:

  • To develop and validate a novel time-resolved diffuse correlation spectroscopy (TD-DCS) system.
  • To overcome the limitations of conventional DCS by simultaneously quantifying tissue optical properties and BFi.
  • To enable depth-resolved BFi measurements for improved brain oxygenation monitoring.

Main Methods:

  • Developed a time-domain diffuse correlation spectroscopy (TD-DCS) device.
  • Acquired temporal point-spread functions to quantify tissue optical properties.
  • Acquired autocorrelation functions for BFi quantification.
  • Applied time-gating strategies to DCS autocorrelation functions for depth-resolved analysis.

Main Results:

  • Successfully demonstrated the TD-DCS system in tissue-like phantoms and rodent models.
  • Showcased the ability to simultaneously measure tissue optical properties and BFi.
  • Validated the capability of differentiating photon path lengths for depth-specific BFi assessment.

Conclusions:

  • The novel TD-DCS method effectively addresses limitations of conventional DCS.
  • TD-DCS allows for accurate, non-invasive, and depth-resolved monitoring of cerebral blood flow.
  • This technology holds significant potential for enhanced patient management and understanding of brain physiology.