Cross-sectional OCT images were analyzed at 1-mm intervals (every 15 frames). Neointimal hyperplasia (NIH) thickness inside stent struts was measured. Stent area and lumen area in every image were measured by manual trace and percent NIH area was calculated as percent NIH area = ([stent area - lumen area]/ stent area) / 100. Measured NIH thickness equal to 0 micro meter was defined as exposure, and maximum distance > 110 micro meter between the strut surface and adjacent vessel surface (thickness of strut and polymer) was defined as malapposition. On an image of stent malapposition, lumen area was divided into an in-stent lumen area and an extra-stent lumen area. . Intracoronary thrombus was defined as a protruding mass beyond the stent strut into the lumen. Bifurcation lesions with major sidebranches were excluded from this analysis. Inter- and intraobserver variabilities were assessed by evaluation of 20 random cross- sectional images by 2 independent readers and by the same reader at 2 separate time points, respectively.