The following table or figure may be downloaded to PowerPoint for personal use in teaching and presentations. This feature is available to all subscribers to the journal.

You MUST read and follow the guidelines at Request to Reproduce AJR Content if you are distributing or using AJR content beyond academic use (limited distribution, non-revenue producing, or educational purposes).

(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

Fig. 7. —Presteal Doppler sonography waveform appearance in right external carotid artery of 54-year-old man with atherosclerotic disease of right brachiocephalic artery. Spectral tracings from right external carotid artery show waveform similar in appearance to presteal waveforms described in vertebral arteries (Fig. 5A, 5B). Doppler sonography tracings from left carotid artery were normal. Stenosis of brachiocephalic artery is thought to cause jet of flow across origin of right common carotid artery, leading to transient drop in pressure at peak systole. Mid systolic retraction is evident in Doppler sonography waveforms.