title: Directional Doppler sonography. A new technique to demonstrate flow reversal in the ophthalmic artery.
mesh_terms: D002340:Carotid Artery Diseases / Q000175:diagnosis*; D002343:Carotid Artery, Internal; D003250:Constriction; D006801:Humans; D008722:Methods; D009880:Ophthalmic Artery; D011674:Pulse; D012039:Regional Blood Flow; D014463:Ultrasonography