Fig. 4From: Ultrasound-guided central venous catheter placement: a structured review and recommendations for clinical practiceColor Doppler imaging and Doppler flow measurements. Short-axis (transverse) view of the right internal jugular vein (blue) and the carotid artery (red) using color Doppler imaging and Doppler flow measurements of the venous (a) and arterial (b) blood flow profile (Color figure online)Back to article page