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Ultra high density imaging arrays in diffuse optical tomography for human brain mapping improve image quality and

Zachary E Markow1, Jason W Trobaugh2, Edward J Richter2

  • 1Mallinckrodt Institute of Radiology, Washington University School of Medicine, 4515 McKinley Ave., St. Louis, MO, 63110, USA. zemarkow@wustl.edu.

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|January 25, 2025
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Summary
This summary is machine-generated.

Ultra-high-density diffuse optical tomography (HD-DOT) offers improved brain imaging. This new system enhances spatial resolution and decoding accuracy for non-invasive brain mapping, rivaling fMRI with more portable equipment.

Keywords:
BrainDOTDiffuse opticsNIRSNeuroimagingOpticalOptical tomographyRetinotopyfMRI

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Area of Science:

  • Neuroimaging
  • Biomedical Engineering
  • Optical Physics

Background:

  • Functional magnetic resonance imaging (fMRI) is a key tool for non-invasive brain mapping.
  • Functional near-infrared spectroscopy (fNIRS) and high-density diffuse optical tomography (HD-DOT) offer portable alternatives to fMRI.
  • HD-DOT provides higher image quality than fNIRS due to smaller inter-optode spacing.

Purpose of the Study:

  • To investigate the impact of reducing inter-optode spacing in HD-DOT on image quality.
  • To develop and evaluate an ultra-high-density DOT system with 6.5-mm spacing.
  • To compare the performance of the new HD-DOT system with fMRI and previous HD-DOT systems.

Main Methods:

  • Simulations were performed to determine optimal inter-optode spacing.
  • An ultra-high-density DOT system with 6.5-mm spacing and 140 dB dynamic range was constructed.
  • The system was used to image stimulus-evoked brain activity and decode visual stimulus position in participants.

Main Results:

  • Simulations suggested 6.5-mm spacing offers optimal image quality and noise-resolution tradeoff.
  • The ultra-high-density DOT system achieved 30-50% higher spatial resolution than previous HD-DOT.
  • Visual stimulus position was decoded with 19-35% lower error compared to previous HD-DOT.

Conclusions:

  • Reducing inter-optode spacing to 6.5 mm significantly improves HD-DOT performance.
  • The developed ultra-high-density DOT system provides fMRI-comparable brain imaging with enhanced portability.
  • This technology advances non-invasive brain mapping and decoding capabilities.