Biliary - Common Bile Duct (Normal)
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When searching for the common bile duct (CBD), color doppler can be useful to differentiate vascular structures from non-vascular structures. In this case the CBD is being measured anteriorly and does not have any pulsations on color doppler. The portal vein and artery can be seen and with the CBD, make the portal triad. A normal CBD should be less than 4mm plus 1mm per decade after 40 years old. It should be measured inner wall to inner wall. Justin Bowra MBBS, FACEM, CCPU Emergency Physician, RNSH et al. (Dr. Chiang)