I had CTs prior to my surgery for the titanium implants.....haven't had one since, come to think of it. Only MRI was some years later for the definitive diagnosis of what was already suspected, lumbar disc herniation at L5/S1. As long as I am conscious and able to tell the medical personnel prior to going to any sort of radiological procedure what I have in my skull, not a problem..... I do sometimes worry, though, if I were involved in, say, an auto accident and unconscious and transported to hospital and whisked right into the radiology department.... Hopefully, especially in the case of a suspected head injury, someone might notice the titanium abutments (the other pieces of the fixtures) sticking out of my skull, as probably in the impact of an auto accident the sound processors themselves would be knocked off my head. At the time I first got my bone-anchored hearing aids I was given a card which had information on it to give to medical personnel but I have long since lost that card, unfortunately. I also have other issues which would be important for medical personnel to know in case of an emergency but again, if I'm unconscious, I won't be able to tell them..... Even if I AM conscious and DO tell them they don't always listen, though. Case in point was at the time of the inevitable surgery for that already-mentioned herniated disc. I told them beforehand that I have a narrow airway and would be a difficult intubation and they nodded and smiled and said, "Ok, sure....we'll take care of it!" Heh, they had to learn the hard way that I was NOT exaggerating. Fortunately, everything came out well in the end and I survived, didn't need an emergency trach, but I hope that those folks learned that maybe next time they should take the patient's word for some things right from the start and use a Difficult Intubation kit right from the get-go......