Fig. 1.

Characteristics of the silicon vessel models used in this study. A truncated cone-shaped silicone tube was used to model the left main coronary artery. A 2.7 Fr C7 Dragonfly OCT imaging catheter (Abbott) was used to measure the size of the silicone tube; the distal segment was approximately 20 mm long, and the internal diameter was 4.16 mm. The diameter expanded to 5.09 mm at the proximal segment, which had a length of approximately 25 mm. The material of the silicon model reflects the actual vessel frictional resistance and hardness