Some devices may interfere with the functioning of ICD due such as metal detectors, radios, magnets. Special care needs to be taken while undergoing a CT scan and MRI. Also, the patient should allow at least 8 weeks for the device to settle firmly in its place and avoid jerky or sudden movements during this period. If you are crossing an airport security check, have a letter from the doctor that you have an ICD implant so that they can do a manual frisking.