Fig. 1From: The assessment of circulating volume using inferior vena cava collapse index and carotid Doppler velocity time integral in healthy volunteers: a pilot studyExample IVC and carotid artery ultrasound images. a IVC diameter measurements were taken 3-5 cm distal to the IVC-right atrial junction. b Common carotid artery diameter and Doppler flow were measured 2 cm proximal to the carotid bulbBack to article page