Kang Lee, Zong Ping Feng, Paul Zheng, and University of Toronto colleagues are measuring blood pressure using a selfie video and transdermal optical imaging technology.
Because of its translucency, phone optical sensors can capture red light reflected from hemoglobin under skin, allowing TOI to visualize and measure blood flow changes.
In a study, two-minute iPhone selfie videos of 1,328 adults were analyzed. Three types of blood pressure were measured with 95 percent accuracy. Pre-recorded videos can also be used.
The technology is being commercialized through Nuralogix, a company founded by Lee and Zheng, which is already measuring resting heart rate using videos.
Click to view University of Toronto video.