Technology to easily measure blood pressure just by taking a selfie with a smartphone will be developed
Blood pressure is an important human indicator related to various diseases and health conditions, and hypertension beyond the normal range is counted as one of lifestyle-related diseases . In order to easily measure such blood pressure, researchers have developed a technology that measures blood pressure simply by 'photographing your face with a smartphone camera.'
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Preventative health at your fingertips: U of T researchers accurately measure blood pressure using phone camera
Kang Lee , a professor of applied psychology at the Ontario Institute of Education at the University of Toronto, and Paul Chan, a postdoctoral researcher, originally developed a contactless lie detector. Lee et al. Used a technique called transcutaneous optical imaging (TOI) to create a system that discriminates whether or not a person is lying, but at one point, `` the system we are developing measures blood pressure. 'Is it possible to use it for?'
If blood pressure is far from the standard, it is likely to lead to health problems such as heart attacks and strokes, and it will benefit many people if blood pressure can be measured easily. “The lie detector is beneficial only for a few people, but measuring blood pressure benefits more people,” Lee commented. The two began exploring ways to use TOI for blood pressure measurement rather than lie detection.
TOI pays attention to the fact that the skin of the face is translucent. When light hits the face, it passes through the skin and hits the red hemoglobin contained in the blood flowing in the blood vessels, and the red light is reflected. I use that. By continuing to photograph the face with a smartphone, it seems that the optical sensor mounted on the smartphone can catch the red light from hemoglobin and measure blood flow under the skin.
The team conducted a total of 1328 Canadian and Chinese adults to test the effectiveness of the developed system. The subjects filmed their face with the iPhone for 2 minutes and measured blood pressure with a system developed by Lee et al. The measurement result by the system was checked against the result of the existing blood pressure measurement device, and it was checked how accurate it was.
As a result, it became clear that the system developed by the research team was able to measure systolic blood pressure, diastolic blood pressure, and pulse pressure with an accuracy of 95-96%. Lee says, “You can see how blood is flowing in various parts of the face from a movie captured with the newly developed technology.”
This is a movie that introduced a system developed by Lee et al.
Preventative health on an app: U of T researchers measure blood pressure using a phone camera-YouTube
All you need to do is shoot your face with your smartphone.
Using TOI, blood flow under the skin can be detected ...
Blood pressure can be measured from changes in blood flow.
Because blood pressure measurement with a smartphone is a very practical system, Lee has set up a startup company called Nuralogix in collaboration with the University of Toronto and entrepreneur Marzio Pozzoli. Nuralogix has already developed and released a blood pressure measurement smartphone app called “ Anura ” based on a system developed by Lee et al. At the time of writing, Anura started from 30 seconds of video recording to stress level and resting heart rate The number can be measured. In the fall of 2019, the Chinese version of the app including blood pressure measurement will be released.
By enabling easy blood pressure measurement using a smartphone app, medical services can be provided to people with limited access to medical care. Lee pointed out that data privacy is important for healthcare apps, Anura sends only measurement results from movies taken by people to the cloud, and the movie itself is not collected in the cloud .
While blood pressure measurement with a smartphone is very convenient, Lee and colleagues say that further research is needed to improve the measurement accuracy with TOI. The survey sample at this stage does not include people with extremely high blood pressure or low blood pressure, and the subjects' skin color was neither extremely dark nor white, so a wider variety of people were investigated. Lee claims that accuracy improves. On the other hand, it is difficult to find patients who have high blood pressure but are not taking drugs, and it is ethical to ask people with high blood pressure to take `` hypertensive drugs before measurement ''. It was difficult to find a suitable survey subject because it was impossible.