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. 2019 Feb 15;101(3):141–149. doi: 10.1308/rcsann.2019.0010

Table 6.

Comparison of computed tomography carotid angiography compared with duplex ultrasound – sensitivity and specificity

Criteria	Weighted mean (%)		Studies (n)	Carotids (n)
	Sensitivity	Specificity
CTA – NASCET > 70% stenosis	88.9	92.4	17	1882
CTA – NASCET > 70% stenosis^a	90.6	93	9	1245
CTA – NASCET > 50% stenosis	81.7	85.6	6	770
Duplex – PSV > 50% stenosis	85.1	86.4	8	3271
Duplex – PSV > 70% stenosis	85.8	84.5	20	3329
Duplex – PSV > 70% stenosis^b	86.5	87.8	12	2223
Duplex – PSV > 70% stenosis^a,c	92.3	89	4	857
Duplex – EDV > 70% stenosis	91.7	72	3	436
Duplex – EDV + PSV > 70% stenosis	97.3	94.2	4	1337
Duplex – EDV + PSV > 70% stenosis^a	98.7	94.1	3	1245

^a Gold standard.

^b Non-consensus and consensus.

^c Consensus only.

EDV, end diastolic velocity; NASCET, North American Symptomatic Carotid Endarterectomy Trial; PSV, peak systolic velocity.