Click on image to view larger version.

Figure 1 RFC

A series of still frame images obtained at 30 frames/s showing an example of obtaining the renal frame count (RFC) (frame 1, 5, 10, 15, 20, and 25 from left to right). The first frame is counted with complete transverse opacification of the renal artery, with the final frame being the identification of a cortical vessel in a relatively straight line; this subject had a renal frame count of 18.