Figure 3
From: Diagnosis of extracranial carotid stenosis by MRA of the brain
A proposed criterion of opacification grading in the ophthalmic artery. Those with visible distal opacification (circles) to the level of the posterior border of the globes (dotted lines), labeled as “complete opacification”, were grade 1. Those with complete loss of the visible ophthalmic opacification (arrow), labeled as “no opacification”, were grade 3. Any conditions other than grade 1 and 3 were labeled as grade 2, “incomplete opacification”.
