FIG 3. Grade 4 stenosis with good correlation in all techniques.

A, Oblique DSA image shows critical stenosis in the right internal carotid artery.

B, Elliptic centric contrast-enhanced MR angiogram depicts the same information.

C, Spiral CT angiogram shows a good correlation with the other imaging techniques. Notice a type 3 calcification in the wall of artery; however, it is sufficiently separated in the reconstruction image.