Fig. 5.

Schema of the proposed global and local method for identification of ending pair. Given a baseline and follow-up IVUS sequence pair, our method constructs a 3D graph and follows two tracks: In the first track, the last baseline frame is fixed and the follow-up frame iteratively shifted by the minimal required length of baseline–follow-up overlap (25 mm in our case). In each iteration, global and local costs embedded in the 3D graph are extracted and combined. By fixing the last follow-up frame and iteratively shifting the baseline frame, another series of costs are obtained in the second track. The frame pair providing minimal cost is chosen as the ending pair.