研究目的
Improving the accuracy of brain function measurements by using near-infrared spectroscopy and developing a cancellation method for disturbances or changes in the skin blood volume.
研究成果
The developed cancellation method using an equilateral triangle configuration was effective in reducing disturbances in brain function measurements. The correction based on the cross-correlation coefficient and amplitude ratio of signals showed promising results, though the effectiveness varied by signal position and calculation method.
研究不足
The correction effect varied depending on the signal position and calculation formula, with overcorrection observed in some cases. The method's effectiveness may be limited by the specific configuration and the nature of disturbances.
1：Experimental Design and Method Selection:
The study deployed probes in an equilateral triangle configuration to detect and cancel absorption changes in the near-surface region. Three calculation methods were used for correction.
2：Sample Selection and Data Sources:
The subject was a 22-year-old man, and measurements were taken during specific postural changes.
3：List of Experimental Equipment and Materials:
Near-infrared lights of two wavelengths (785 and 830 nm), optical fibers, detector circuits, and 16-bit 1-kHz-sampling parallel analog-to-digital converters were used.
4：Experimental Procedures and Operational Workflow:
The sensors were attached to the subject's forehead, and changes in blood volume were measured during postural changes.
5：Data Analysis Methods:
The correction methods included simple correction, weighted correction, and correlation correction based on the cross-correlation coefficient and amplitude ratio of signals.
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