Figure 2From: A technical modification for percutaneous tracheostomy: prospective case series study on one hundred patientsUltrasound image of the trachea. Longitudinal view of the trachea shows the cricoid cartilage and the tracheal rings; important anatomical references to localize the site of puncture of the trachea. The endotracheal tube has been pulled back. I, II, III (first, second, and third tracheal rings); image obtained with an 8 MHz vascular probe.Back to article page