title: Quantification and assessment of extracranial and intracranial occlusive disease.
abstract: BACKGROUND
  Treatment planning for vascular occlusive disease depends in part on quantitative assessment of the degree of occlusion. Digital subtraction angiography is the gold standard for quantitative imaging although other modalities can also be used.
  
  
  CONCLUSIONS
  Three different schemes for measuring percent stenosis of an occluded artery are all valid but may produce different results.
  
  
  CONCLUSIONS
  The choise of method for measurement is less important than consistency of application.
authors.affiliation: Division of Neurology, Department of Medicine, University of Alberta;
authors.forename: Muhammad S
authors.initials: MS
authors.lastname: Hussain
authors.forename: Rishi
authors.initials: R
authors.lastname: Gupta