A portable, multi-channel fNIRS system for prefrontal cortex: Preliminary study on neurofeedback and imagery tasks
(Conference Presentation)

Seung-ho Paik; Beop-Min Kim

doi:10.1117/12.2214019

26 April 2016 A portable, multi-channel fNIRS system for prefrontal cortex: Preliminary study on neurofeedback and imagery tasks (Conference Presentation)

Seung-ho Paik, Beop-Min Kim

Author Affiliations +

Proceedings Volume 9690, Clinical and Translational Neurophotonics; Neural Imaging and Sensing; and Optogenetics and Optical Manipulation; 96900V (2016) https://doi.org/10.1117/12.2214019
Event: SPIE BiOS, 2016, San Francisco, California, United States

Abstract

fNIRS is a neuroimaging technique which uses near-infrared light source in the 700-1000 nm range and enables to detect hemodynamic changes (i.e., oxygenated hemoglobin, deoxygenated hemoglobin, blood volume) as a response to various brain processes. In this study, we developed a new, portable, prefrontal fNIRS system which has 12 light sources, 15 detectors and 108 channels with a sampling rate of 2 Hz. The wavelengths of light source are 780nm and 850nm. ATxmega128A1, 8bit of Micro controller unit (MCU) with 200~4095 resolution along with MatLab data acquisition algorithm was utilized. We performed a simple left and right finger movement imagery tasks which produced statistically significant changes of oxyhemoglobin concentrations in the dorsolateral prefrontal cortex (dlPFC) areas. We observed that the accuracy of the imagery tasks can be improved by carrying out neurofeedback training, during which a real-time feedback signal is provided to a participating subject. The effects of the neurofeedback training was later visually verified using the 3D NIRfast imaging. Our portable fNIRS system may be useful in non-constraint environment for various clinical diagnoses.

Conference Presentation

Citation Download Citation

Seung-ho Paik and Beop-Min Kim "A portable, multi-channel fNIRS system for prefrontal cortex: Preliminary study on neurofeedback and imagery tasks (Conference Presentation)", Proc. SPIE 9690, Clinical and Translational Neurophotonics; Neural Imaging and Sensing; and Optogenetics and Optical Manipulation, 96900V (26 April 2016); https://doi.org/10.1117/12.2214019

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KEYWORDS

Light sources

Prefrontal cortex

Neuroimaging

Blood

Brain

Data acquisition

Detection and tracking algorithms

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