Assessment of carotid artery ultrasonography in the presence of an acoustic shadow artifact

BMC Neurology

Table 3 Impact of Acoustic Shadow artifact on Color Doppler Ultrasonography reliability

	CTA/CDUS correlations (Pearson’s r)	P value	Cronbach’s alpha	ICC	P value	CDUS Sensitivity^a	CDUS Specificity^a	PPV	NPV
No AS	0.687	< 0.001	0.56	0.515	< 0.001	83.3%	72.8%	33.3%	96.4%
Small AS	0.570	< 0.001	0.61	0.571	< 0.001	89.5%	76.3%	35.4%	98.0%
Large AS	0.49	0.014	0.38	0.382	0.12	62.5%	62.5%	45.5%	76.9%

Correlations between percent stenosis on CDUS and CTA studies according to the presence and extent of the acoustic shadow artifact
Legend: CDUS Color Doppler ultrasound, CTA CT angiography, ICC Inter Class Correlation, PPV Positive Predictive Value, NPV Negative Predictive Value
^a For severe stenosis defined as % stenosis > 70% on CTA, Peak systolic velocity > 240 cm/s

ISSN: 1471-2377