If the magnetic field is measured using a multichannel device, a map of the magnetic field is obtained over the chest; from such a map, using mathematical algorithms that take into account the conductivity structure of the torso, it is possible to locate the source of the activity.

The turning point came with the development of the sensitive detector called the SQUID (superconducting quantum interference device) by James Zimmerman.

[3] The combination of this detector and Cohen's new shielded room at MIT allowed the MCG signal to be seen as clearly as the conventional electrocardiogram, and the publication of this result by Cohen et al.[4] marked the real beginning of magnetocardiography (as well as biomagnetism generally).

The MCG system, CS MAG II of Biomagnetik Park GmbH, was installed at Coburg Hospital in 2013.

[citation needed] Genetesis, a medical imaging company based in Mason, OH, is developing a device called the CardioFlux that leverages MCG technology to diagnose heart-related conditions.