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8 February 2017 Functional near infrared spectroscopy for awake monkey to accelerate neurorehabilitation study
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Proceedings Volume 10051, Neural Imaging and Sensing; 1005117 (2017)
Event: SPIE BiOS, 2017, San Francisco, California, United States
Functional near-infrared spectroscopy (fNIRS) is suitable for measuring brain functions during neurorehabilitation because of its portability and less motion restriction. However, it is not known whether neural reconstruction can be observed through changes in cerebral hemodynamics. In this study, we modified an fNIRS system for measuring the motor function of awake monkeys to study cerebral hemodynamics during neurorehabilitation. Computer simulation was performed to determine the optimal fNIRS source–detector interval for monkey motor cortex. Accurate digital phantoms were constructed based on anatomical magnetic resonance images. Light propagation based on the diffusion equation was numerically calculated using the finite element method. The source–detector pair was placed on the scalp above the primary motor cortex. Four different interval values (10, 15, 20, 25 mm) were examined. The results showed that the detected intensity decreased and the partial optical path length in gray matter increased with an increase in the source-detector interval. We found that 15 mm is the optimal interval for the fNIRS measurement of monkey motor cortex. The preliminary measurement was performed on a healthy female macaque monkey using fNIRS equipment and custom-made optodes and optode holder. The optodes were attached above bilateral primary motor cortices. Under the awaking condition, 10 to 20 trials of alternated single-sided hand movements for several seconds with intervals of 10 to 30 s were performed. Increases and decreases in oxy- and deoxyhemoglobin concentration were observed in a localized area in the hemisphere contralateral to the moved forelimb.
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Hiroshi Kawaguchi, Noriyuki Higo, Junpei Kato, Keiji Matsuda, and Toru Yamada "Functional near infrared spectroscopy for awake monkey to accelerate neurorehabilitation study", Proc. SPIE 10051, Neural Imaging and Sensing, 1005117 (8 February 2017);


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