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Complete head cerebral sensitivity mapping for diffuse correlation spectroscopy using subject-specific magnetic

Melissa M Wu1, Katherine Perdue2, Suk-Tak Chan1

  • 1Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, USA.

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|April 13, 2022
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Summary
This summary is machine-generated.

This study maps brain sensitivity for diffuse correlation spectroscopy (DCS), an optical method for monitoring blood flow. Results show sensitivity varies across the head, mainly due to scalp thickness, guiding optimal probe placement for better bedside monitoring.

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Area of Science:

  • Biomedical Optics
  • Neuroimaging
  • Medical Physics

Background:

  • Diffuse correlation spectroscopy (DCS) is an optical technique for non-invasive bedside cerebral perfusion monitoring.
  • Accurate interpretation of DCS signals requires understanding light propagation and sensitivity within the adult human head.

Purpose of the Study:

  • To characterize the spatial distribution of cerebral sensitivity for DCS across the entire adult human head.
  • To identify factors influencing sensitivity variations and provide guidance for optimizing probe placement.

Main Methods:

  • Utilized 16 subject-specific magnetic resonance imaging (MRI)-derived head models.
  • Performed Monte Carlo light propagation simulations at over 800 uniformly distributed locations on the head.
  • Analyzed spatial variations in sensitivity and their correlation with anatomical features like extracerebral thickness.

Main Results:

  • Identified significant and consistent spatial variations in cerebral sensitivity across subjects.
  • Found that extracerebral (scalp) thickness is a primary determinant of these sensitivity differences.
  • Discovered correlates of sensitivity variations suitable for real-time assessment.

Conclusions:

  • Cerebral sensitivity for DCS is not uniform across the head and varies predictably with extracerebral thickness.
  • Optimizing DCS probe placement based on individual head anatomy is crucial for accurate bedside cerebral perfusion monitoring.
  • These findings enhance the reliability and application of DCS in clinical settings.