Scientists in Japan have developed a technique that uses microwaves to measure a patient’s vital signs.

The system uses weak microwaves to irradiate and scatter off the human body. A sensitive microwave sensor measures the reflected waves, which change in response to body motions such as movement of the chest caused by beating heart.

By using signal processing algorithms and techniques to eliminate the effects of random body motions, the scientists were able to detect changes in heart rate in real time.

According to the scientists, the technique could lead to the development of non-invasive system that can be used as vital signs monitor, daily health monitor and security monitor.