These multichannel sensors effectively cancel the environmental magnetic and electro-magnetic noises in order to create a map of cardiac magnetic activities. Digital signal processing is then applied to enhance the ration between signal and noise. The diagnosis of heart diseases, especially coronary artery disease, can then be made reliably by the doctors based on the parameters from the magnetic
field or current maps. The first primitive MCG system was being developed in early 1960s. Many improved models have been adopted worldwide for clinical diagnosis. The latest refined model (The MCG system, CS MAGII, Biomagnetik Park GmbH) has been implanted in hospitals in Germany since 2011. The first MCG centre in Asia is set up in Hong Kong, adapting the same technology from Germany.
