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Three methods of measuring stenosis. Percent stenosis is (1-A/B)*100, where A is the smallest diameter in the occluded segment and B is the reference (presumably normal) diameter. In the NASCET scheme, B is B1; in the ECST scheme, B is B2; and in the common carotid artery scheme, B is B3 when measuring occlusion in the internal carotid artery.
