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Table 4. Definitions of CIED Systems in Relation to MRI
MR conditional refers to any device for which a specified MRI environment with
specified conditions of use does not pose a known hazard.
For MR conditional CIED systems, the labeling requires testing sufficient to
characterize the system behavior in the MRI environment. Such testing includes
measuring magnetically induced force and torque, current induction, and RF heating.
Other testing measures involve modeling of potential electromagnetic interference
from the MRI environment with the CIED system.
MR nonconditional systems include all CIED systems other than those that meet MR
conditional labeling.
Zone 4 refers to the MRI scanner room and is the physical space with the highest risk to
patients and staff, including the potential for flying metal objects.
Zone 3 is the space just outside the MRI scanner room (Zone 4), and includes the areas
for patient holding and the control room.
Zone 2 includes the patient reception and interview/screening areas.
Zone 1 refers to regions that are accessible to the general public with no restrictions.
