Table 4

Agreement between non-invasive procedures and digital subtraction angiography for appropriateness of surgery for symptomatic carotid stenosis

DSA
Non-invasive techniqueOperableNot operableSensitivitySpecificity
Operable, 80–99% stenosis; not operable, 0–79% or 100% stenosis.
CT, computed tomography; DSA, digital subtraction intra-arterial angiography; MR, magnetic resonance.
CT angiographyOperable130
Not operable7140.651.00
MR angiographyOperable206
Not operable081.000.57
DopplerOperable174
Not operable3100.850.71