Abstract
A noncontact brain activity measurement system using phosphor [Li(Nd0.9Yb0.1)P4O12] which is excited by and emits near-infrared light was developed. To optimize and validate this system, first, the influence of fluorescence lifetime on the amplitude of lock-in detection was investigated to determine the optimal frequency of the light source's intensity modulation. Second, the sensitivity of the system to the internal absorbance change was estimated using a phantom measurement. Third, to clearly show that this system can detect the absorbance changes in the cerebral blood instead of those in the superficial regions, the hemoglobin changes in the same area of the prefrontal cortex were measured during a working memory task by simultaneously using this system and a conventional contact optical topography system. Finally, the precision of the system was evaluated. The results verified that this system was as effective as a conventional system in detecting human brain activity.
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