Patent ID: 8710841

Claim:
A system comprising: an implantable medical device (IMD) configured to be implanted into a subject, the IMD including: a sensing circuit configured to receive physiologic information from the subject during a portion of a magnetic resonance imaging (MRI) session; and a static magnetic field sensor configured to detect a static magnetic field; wherein the IMD is configured to: identify an indication of an active MRI scan; identify an indication of proximity to a static magnetic field using information about the detected static magnetic field from the static magnetic field sensor; determine a time period to inhibit use of physiologic information from the subject following the identified indication of the active MRI scan; and update at least one subject therapy parameter using the indication of proximity to the static magnetic field; wherein the IMD is configured to inhibit use of the received physiologic information from the subject for an initial time period following the identified indication of the active MRI scan, to identify an indication of a subsequent active MRI scan following the initial time period, and to adjust the initial time period to determine an optimal time period for a subsequent portion of the MRI session using the indication of the subsequent active MRI scan following the initial time period.