Electromagnetic shielding is the process of limiting the penetration of electromagnetic fields into a space, by blocking them with a barrier made of conductive material. Typically it is applied to enclosures, separating electrical devices from the ‘outside world’, and to cables, separating wires from the environment the cable runs through. Electromagnetic shielding used to block radio frequency electromagnetic radiation, is also known as RF shielding.

In MRI installations, RF Shielding is used to prevent unwanted interferance with the MRI image, which could result in poor image quality.  MRI Shielding must be installed in all MRI Scanner installations.