研究目的
Investigating the effect of applying two common light beam profiles including Uniform and Gaussian on the penetration depth of an LED-based near infrared spectroscopy.
研究成果
The LED-based NIR spectroscopy equipped with bi-convex lenses provides a penetration depth and quality measurements comparable to laser-based NIR spectroscopy, especially in stress assessment applications.
研究不足
A small number of participants were employed in the study. Future studies could investigate the effect of using diverse distances of the transmitter and receiver and multiple transmitter and receivers in different arrangements.
1：Experimental Design and Method Selection:
The study involved two experiments; a simulation experiment using a liquid phantom with static and pulsating absorbers, and an in vivo experiment of stress assessment.
2：Sample Selection and Data Sources:
A liquid phantom simulating brain tissue was used in the simulation experiment, and seven healthy male adults participated in the in vivo experiment.
3：List of Experimental Equipment and Materials:
LED-based NIR spectroscopy device, laser NIR spectroscopy device (Oxymon Mk III), plano-convex and bi-convex lenses, flat lens, liquid phantom made of diluted Lipovenoes10%, and Indian ink for pulsation simulation.
4：Experimental Procedures and Operational Workflow:
The simulation experiment involved scanning the intra space of the phantom with a local absorber and simulating a vessel pulsation. The in vivo experiment involved recording NIR spectroscopy signals during a stress assessment task.
5：Data Analysis Methods:
Correlation values were calculated for different configurations, and HRV signals were extracted and analyzed for stress classification.
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