Where does the Doppler  waveform contour describes as “string sign” usually occur?

Using this image and spectral Doppler, this would most likely be;deformed car stent(1).jpg

Critical stenosis occurs when cross-sectional area has been reduced by _______, which is a _______ diameter reduction. 

Restenosis that occurs 5-10 years post endarterectomy is considered to be intimal hyperplasia.

If a stenosis measures or appears less than 50% by image/caliber but velocity acceleration with post stenotic turbulence occurs, the lesion is considered greater than:

A contralateral ICA occlusion may cause the ipsilateral ICA velocities to be;

Blood always moves from an area of __________ to an area of __________. 

The most common medical treatment of acute ischemic stroke is;

Which of the following techniques may provide the best assistance of proper visualization of the carotid bifurcation in the early postoperative period?

A “rule of thumb”  for spectral Doppler and stenosis is that a 50% diameter reduction is equal to;