Note: wearable near-infrared spectroscopy imager for haired region

Area of Science:

• Neuroscience
• Biomedical Engineering
• Optical Imaging

Background:

• Noninvasive brain activity monitoring is crucial for understanding neurological function.
• Existing near-infrared spectroscopy (NIRS) systems often face limitations in hair-covered regions.
• Developing wearable systems enhances the potential for real-world brain activity studies.

Purpose of the Study:

• To develop a novel wearable optical topography system utilizing near-infrared spectroscopy (NIRS).
• To enable noninvasive brain activity observation, including in scalp regions obscured by hair.
• To create a head-mounted device for versatile cortical imaging.

Main Methods:

• Designed a wearable system incorporating an avalanche photodiode, high voltage DC-DC converter, and preamplifier within an electrically shielded case.
• Developed specialized rubber teeth and a glass rod to effectively clear hair and ensure scalp contact.
• Integrated these components into a head-mountable device for practical application.

Main Results:

• Successfully developed the first wearable NIRS imager capable of accessing any cortical region.
• Demonstrated the system's ability to noninvasively observe brain activity.
• Successfully recorded activity in the motor cortex during a finger-tapping task.

Conclusions:

• The developed wearable NIRS system offers a breakthrough for noninvasive brain monitoring, overcoming hair-related limitations.
• This technology enables unprecedented observation of cortical activity in diverse real-world scenarios.
• The system holds significant potential for advancing neuroscience research and clinical applications.