A system and a method for detecting an occurrent or forming region of increased electrical conductivity on a human subject's skin surface are disclosed. The system comprises a user interface and a skin surface conductivity detection system. The latter comprises a terahertz transmitter, a terahertz camera for recording terahertz waves reflected off a subject's body, and an image processing unit adapted to execute software code which implements said method. The method comprises receiving image data from the terahertz camera； analyzing the image data for an occurrence of a temporal and / or spatial characteristic featuring an electrical conductivity which is related to a predefined threshold at which a thermal burn of the subject's skin surface at the region is avoided during exposure to an RF field of a magnetic resonance imaging system for imaging the subject； and sending information regarding the analysis to the user interface.
