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- W4323048488 abstract "Functional near infrared spectroscopy has been used in recent decades to sense and quantify changes in hemoglobin concentrations in the human brain. This noninvasive technique can deliver useful information concerning brain cortex activation associated with different motor/cognitive tasks or external stimuli. This is usually accomplished by considering the human head as a homogeneous medium; however, this approach does not explicitly take into account the detailed layered structure of the head, and thus, extracerebral signals can mask those arising at the cortex level. This work improves this situation by considering layered models of the human head during reconstruction of the absorption changes in layered media. To this end, analytically calculated mean partial pathlengths of photons are used, which guarantees fast and simple implementation in real-time applications. Results obtained from synthetic data generated by Monte Carlo simulations in two- and four-layered turbid media suggest that a layered description of the human head greatly outperforms typical homogeneous reconstructions, with errors, in the first case, bounded up to ∼20% maximum, while in the second case, the error is usually larger than 75%. Experimental measurements on dynamic phantoms support this conclusion." @default.
- W4323048488 created "2023-03-04" @default.
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- W4323048488 date "2023-03-27" @default.
- W4323048488 modified "2023-10-10" @default.
- W4323048488 title "Reconstruction of light absorption changes in the human head using analytically computed photon partial pathlengths in layered media" @default.
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- W4323048488 doi "https://doi.org/10.1364/josaa.482288" @default.
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