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Related Concept Videos

Brain Imaging01:14

Brain Imaging

Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans),  magnetic resonance imaging (MRI),  functional magnetic resonance imaging (fMRI), and Transcranial Magnetic Stimulation (TMS).

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Related Experiment Video

Updated: May 22, 2026

Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
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Functional brain mapping using whole-head very high-density diffuse optical tomography.

Morgan Fogarty1,2, Sean M Rafferty2, Zachary E Markow2

  • 1Imaging Science Doctoral Program, Washington University in St. Louis, St. Louis, MO, United States.

Imaging Neuroscience (Cambridge, Mass.)
|August 13, 2025
PubMed
Summary
This summary is machine-generated.

A new very high-density diffuse optical tomography (VHD-DOT) system offers improved image quality for naturalistic neuroimaging tasks. This wearable optical imaging approach shows strong agreement with fMRI, making it a promising alternative for brain activity studies.

Keywords:
brain mappingdiffuse optical tomographyfunctional near-infrared spectroscopynaturalistic stimulusneural decoding

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Area of Science:

  • Neuroimaging
  • Biomedical Engineering
  • Optical Physics

Background:

  • Naturalistic neuroimaging tasks, like watching movies, are gaining popularity for their engagement and ecological validity.
  • Existing optical imaging methods, such as functional near-infrared spectroscopy (fNIRS), offer a wearable and non-invasive approach.
  • High-density diffuse optical tomography (HD-DOT) has advanced fNIRS, achieving functional magnetic resonance imaging (fMRI)-comparable fidelity.

Purpose of the Study:

  • To enhance image quality and expand the field of view for optical neuroimaging.
  • To develop a very high-density diffuse optical tomography (VHD-DOT) system for naturalistic tasks.
  • To evaluate VHD-DOT's performance against fMRI in task-based and naturalistic settings.

Main Methods:

  • Developed a VHD-DOT system with a 9.75 mm grid spacing, increasing measurement density 4-fold.
  • Utilized 255 sources and 252 detectors for comprehensive whole-head coverage.
  • Employed simulations and in vivo experiments with functional localizers and movie-viewing tasks.

Main Results:

  • Simulations indicated improved image resolution with VHD-DOT compared to HD-DOT.
  • Group-averaged functional localizer maps from VHD-DOT strongly agreed with fMRI results.
  • Feature regressor analysis of movie-viewing data showed excellent agreement between VHD-DOT and fMRI.
  • VHD-DOT signals demonstrated repeatability and discriminability for advanced analyses.

Conclusions:

  • VHD-DOT significantly improves image quality and resolution for whole-head optical imaging.
  • VHD-DOT serves as a viable surrogate for fMRI in task-based neuroimaging studies.
  • The VHD-DOT system shows promise for complex stimuli, decoding analyses, and future wireless applications.