Figure 2From: Real-time ultrasound-guided percutaneous dilatational tracheostomy: a feasibility studyAxial image of trachea and surrounding structures with depiction of pre-tracheal veins using color duplex imaging. Tr, Tracheal lumen; Th, lobes of thyroid; I, thyroid isthmus; Arrowheads, pre-tracheal veins.Back to article page