Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Measurement of the take-off angles. (a) In cases of right common carotid and subclavian arteries. (b) In cases of left common carotid and brachiocephalic arteries. Straight lines (broad dotted lines) are drawn at the center (white circles) of arterial orifices (thin dotted lines) in a direction parallel to the artery. The turning point (black circle) of a catheter (arrows) is the intersection of two lines. The take-off angle (θ) is the angle between the two lines
