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Evaluating a new generation of wearable high-density diffuse optical tomography technology via retinotopic mapping of the adult visual cortex.
Vidal-Rosas, Ernesto E; Zhao, Hubin; Nixon-Hill, Reuben W; Smith, Greg; Dunne, Luke; Powell, Samuel; Cooper, Robert J; Everdell, Nicholas L.
  • Vidal-Rosas EE; University College London, Diffuse Optical Tomography of the Human Brain Research Group, Biomedical Optics Research Laboratory, Department of Medical Physics and Biomedical Engineering, London, United Kingdom.
  • Zhao H; University College London, Diffuse Optical Tomography of the Human Brain Research Group, Biomedical Optics Research Laboratory, Department of Medical Physics and Biomedical Engineering, London, United Kingdom.
  • Nixon-Hill RW; University of Glasgow, James Watt School of Engineering, Glasgow, United Kingdom.
  • Smith G; Imperial College London, Department of Mathematics, London, United Kingdom.
  • Dunne L; Gowerlabs Ltd., London, United Kingdom.
  • Powell S; Gowerlabs Ltd., London, United Kingdom.
  • Cooper RJ; Gowerlabs Ltd., London, United Kingdom.
  • Everdell NL; Gowerlabs Ltd., London, United Kingdom.
Neurophotonics ; 8(2): 025002, 2021 Apr.
Article in English | MEDLINE | ID: covidwho-1666346
ABSTRACT

Significance:

High-density diffuse optical tomography (HD-DOT) has been shown to approach the resolution and localization accuracy of blood oxygen level dependent-functional magnetic resonance imaging in the adult brain by exploiting densely spaced, overlapping samples of the probed tissue volume, but the technique has to date required large and cumbersome optical fiber arrays.

Aim:

To evaluate a wearable HD-DOT system that provides a comparable sampling density to large, fiber-based HD-DOT systems, but with vastly improved ergonomics.

Approach:

We investigated the performance of this system by replicating a series of classic visual stimulation paradigms, carried out in one highly sampled participant during 15 sessions to assess imaging performance and repeatability.

Results:

Hemodynamic response functions and cortical activation maps replicate the results obtained with larger fiber-based systems. Our results demonstrate focal activations in both oxyhemoglobin and deoxyhemoglobin with a high degree of repeatability observed across all sessions. A comparison with a simulated low-density array explicitly demonstrates the improvements in spatial localization, resolution, repeatability, and image contrast that can be obtained with this high-density technology.

Conclusions:

The system offers the possibility for minimally constrained, spatially resolved functional imaging of the human brain in almost any environment and holds particular promise in enabling neuroscience applications outside of the laboratory setting. It also opens up new opportunities to investigate populations unsuited to traditional imaging technologies.
Keywords

Full text: Available Collection: International databases Database: MEDLINE Type of study: Experimental Studies Language: English Journal: Neurophotonics Year: 2021 Document Type: Article Affiliation country: 1.NPh.8.2.025002

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Full text: Available Collection: International databases Database: MEDLINE Type of study: Experimental Studies Language: English Journal: Neurophotonics Year: 2021 Document Type: Article Affiliation country: 1.NPh.8.2.025002