MRI conditional safety of mixed systems: Study of the impact of active implant medical device impedance on the radiofrequency-induced lead heating.

Purpose: The aim of this paper is to study the impact of pulse generator small impedance variations on the overall radiofrequency (RF)-induced heating of a cardiac rhythm management (CRM) lead in a 1.5 T MR system.

Methods: An analysis was conducted on two CRM pacing leads with different structural designs.