Simulated altitude exposure assessment by hyperspectral imaging.

Area of Science:

• Aeronautic Medicine
• Biomedical Engineering
• Physiology

Background:

• Assessing human physiological responses to hypoxia is crucial for aeronautic medicine.
• Understanding oxygenation changes during hypoxia informs safety protocols for aircrew.
• Current monitoring methods may have limitations in providing detailed spatial oxygenation data.

Purpose of the Study:

• To present a novel method for monitoring blood oxygenation during experimental hypoxia.
• To utilize hyperspectral imaging (HSI) and a modified Beer–Lambert law for detailed oxygenation mapping.
• To investigate the physiological response to hypoxia and high altitude conditions.

Main Methods:

• Employed a line-scan hyperspectral imaging (HSI) system to capture facial images of 20 healthy male volunteers.
• Applied a spectral unmixing model based on the modified Beer–Lambert law to analyze HSI data.
• Generated oxyhemoglobin, deoxyhemoglobin, and oxygen saturation distribution maps from forehead skin.

Main Results:

• Successfully generated detailed distribution maps of oxyhemoglobin and deoxyhemoglobin during hypoxia and recovery.
• Observed an interesting pattern of desaturation on the forehead, highlighting HSI's capability.
• Validated oxygen saturation maps against pulse oximetry measurements.

Conclusions:

• Hyperspectral imaging offers an advantageous method for monitoring skin oxygenation under hypoxic conditions.
• The discovered desaturation pattern provides new insights into physiological responses to high altitude.
• This HSI-based approach may advance aircrew testing and assessment in aeronautic medicine.