Researchers at the University of Science and Technology of China recently have realized real-time non-contact human ECG monitoring using millimeter-wave radar. They took advantage of the fact that the electrical and mechanical activities of the heart are the same source of cardiac activity but have different characteristics, and used millimeter wave radar to measure cardiac mechanical activity on the body surface in a non-contact manner and extract 4D cardiac mechanical activity signals. The data-driven method was then used to clarify the problem of conversion in the area in question, and finally the ECG waveform was recovered. Compared to conventional ECGs, the non-contact ECG achieved an average time accuracy of within 14 milliseconds and an average morphology accuracy of over 90%. According to the researchers, the method’s monitoring results also support stable monitoring of the PR interval, a key indicator in the diagnosis of cardiovascular disease, with an error margin of less than 9 milliseconds. The index has important diagnostic value for diseases such as arrhythmia and myocardial infarction.