Fig. 2.

Seventy-one-year-old man suffering from caludication of the left lower extremity, examined by the traditional method. A multi-phase study was performed, and the acquisition time of each phase was 15 seconds. Due to mismatched timing of the first phase (A), the second phase (B) should be used as the arterial phase image.

A. The first phase image shows insufficiently enhanced femoral arteries (solid arrow). Due to the acquisition of a non-enhanced mask image before previous station angiography, background enhancement (open arrow) is noted.

B. The second-phase image discloses more densely enhanced femoral artery (solid arrow) and its branches. Atherosclerosis results in abrupt cut-off of the left superficial femoral artery, with reconstituted distal run-off (open arrows).