With the global epidemic of coronavirus, body temperature monitoring soon became one of the fastest tools for diagnosing Covid-19. But now researchers have proposed a new way to get body temperature by infrared scanning.
«خوزه ال. Ramirez-Garcia Luna, a faculty member at McGill University and lead author of an article published in the European Journal of Clinical Investigation. Says“There are several major drawbacks to using traditional methods of measuring body temperature. The first problem is that measuring absolute temperature or forehead temperature is of very limited value. “Because if you do not measure temperature through the armpits, mouth or eardrum, what is recorded is the temperature of the skin, not the internal temperature of the body.”
The difference between these two temperatures is very important because the internal temperature of the human body in the steady state is about 37 degrees, but body surface temperature can vary between people or even in different parts of a person’s body depending on various factors such as ambient temperature or humidity, physical activity, hormones. And the difference in blood flow is different. As a result, the temperature obtained from the forehead can not be an exact number for the internal temperature of the body.
“I think the next big drawback, which is even more important, is that the study strategy is based on identifying a fever,” says Ramirez-Garcia Luna. Fever means that the internal body temperature has exceeded 38.3 degrees. “It is unknown at this time what he will do after leaving the post.”
However, if a relative measurement is obtained, skin temperature monitoring can be more useful. Ramirez-Garcia Luna explains: “The strategy we adopted for our research was to use forehead temperature as a reference for comparing people’s eye temperatures. There were two reasons for this approach: first, the eye, and especially the carotid artery, which is the area around the nose, has many blood vessels, and this part responds dynamically to inflammatory stimuli. “Second, the corona virus has been shown to affect blood vessels and eye tissue, so this area probably opens a window to observe the infectious process.”
Researchers have found that a temperature difference of 0.55 degrees or higher between the forehead and eyes can indicate Covid-19 infection. “The results of our research question current approaches to surveying individuals and provide a way to use more appropriate strategies that can easily be applied on a large scale,” says Ramirez-Garcia Luna. But care must be taken in interpreting these results because these studies are still in the experimental stage. Another possible limitation that must be addressed before using this method extensively is ethical concerns about facial imagery. “But this problem can be solved by blurring images and automating the temperature measurement process.”
“We are currently trying to automate this process to eliminate some of its variability factors,” said McGill University researcher. “We also want to work with others to test this method in different scenarios.”