Around 4 years after radiation my ENT had a baseline ultrasound done on my carotid artery. The results should nothing significant. Then at 6 years, he pronounced me cured and set me free from his care. I'm now at 9 years post treatment. The only doctor monitoring me is my super dentist (prosthodontist), and endocrinologist (growing thyroid nodules). I'm going to call the ENT's office and ask, but I'm curious if others have had follow-up ultrasounds on their carotid artery, and at what intervals.