Fig 4. ROC curves depicting the performance of each model in identifying near-occlusion stenosis. The model is more accurate the further the curve lies above the reference line (greatest area under the ROC curve). A, Ratio of the distal ICA lumen to the contralateral distal ICA lumen (dICA:dICA*, solid line), the most accurate model to identify near-occlusion stenosis. B, Distal ICA lumen (dICA, dotted line) is the second most accurate model. C, Ratio of the distal ICA lumen to that of the ipsilateral ECA (ICA: ECA, dot-dashed line), is the third most accurate model. D, The ICA stenosis model (ICA, dashed line) is the least accurate to identify near-occlusion stenosis.