Comput Math Methods Med - A DAQ-device-based continuous wave near-infrared spectroscopy system for measuring human functional brain activity.

Tópicos

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Resumo

In the last two decades, functional near-infrared spectroscopy (fNIRS) is getting more and more popular as a neuroimaging technique. The fNIRS instrument can be used to measure local hemodynamic response, which indirectly reflects the functional neural activities in human brain. In this study, an easily implemented way to establish DAQ-device-based fNIRS system was proposed. Basic instrumentation components (light sources driving, signal conditioning, sensors, and optical fiber) of the fNIRS system were described. The digital in-phase and quadrature demodulation method was applied in LabVIEW software to distinguish light sources from different emitters. The effectiveness of the custom-made system was verified by simultaneous measurement with a commercial instrument ETG-4000 during Valsalva maneuver experiment. The light intensity data acquired from two systems were highly correlated for lower wavelength (Pearson's correlation coefficient r = 0.92, P < 0.01) and higher wavelength (r = 0.84, P < 0.01). Further, another mental arithmetic experiment was implemented to detect neural activation in the prefrontal cortex. For 9 participants, significant cerebral activation was detected in 6 subjects (P < 0.05) for oxyhemoglobin and in 8 subjects (P < 0.01) for deoxyhemoglobin.

Resumo Limpo

last two decad function nearinfrar spectroscopi fnir get popular neuroimag techniqu fnir instrument can use measur local hemodynam respons indirect reflect function neural activ human brain studi easili implement way establish daqdevicebas fnir system propos basic instrument compon light sourc drive signal condit sensor optic fiber fnir system describ digit inphas quadratur demodul method appli labview softwar distinguish light sourc differ emitt effect custommad system verifi simultan measur commerci instrument etg valsalva maneuv experi light intens data acquir two system high correl lower wavelength pearson correl coeffici r p higher wavelength r p anoth mental arithmet experi implement detect neural activ prefront cortex particip signific cerebr activ detect subject p oxyhemoglobin subject p deoxyhemoglobin

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