4.7 Article

Remote Blood Pressure Sensing Using Near-Infrared Wideband LEDs

Journal

IEEE SENSORS JOURNAL
Volume 21, Issue 21, Pages 24327-24337

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2021.3111628

Keywords

Light emitting diodes; Blood pressure; Wideband; Phosphors; Glass; Biomedical monitoring; Skin; Facial near-infrared images; near-infrared wideband LED; remote blood pressure

Funding

  1. Aoyama Gakuin University Research Institute Early Eagle grant program for promotion of research by early career researchers

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The research team developed a technology using NIR wideband LEDs for remote blood pressure estimation, aiming to improve accuracy through analyzing facial image features. The study found that the root mean square error between the measured and estimated MBP using NIR wideband LEDs was around 4 mmHg in two out of three subjects.
Long-term and continuous blood pressure monitoring in daily life is important, especially for early detection and prevention of hypertension. The near-infrared (NIR) spectral region, which belongs to the middle of the visible and infrared bands, is the wavelength band with high biological permeability and called as a living-body window. Our research group developed an NIR wideband LED with a wide emission band in the NIR spectral region and applied the NIR wideband LED in remote blood pressure estimation. The accuracy of remote blood pressure estimation can be improved by using the spatial features of facial images, including multi-wavelength information. In this study, we describe the estimation of remote blood pressure using NIR wideband LEDs. Features in the nasal and lip regions, which contributed to estimating blood pressure, were analyzed using facial NIR images. Furthermore, the root mean square error between the measured and estimated MBP was around 4 mmHg using the NIR wideband LEDs in two of three subjects.

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