在猪冠脉内植入两种支架后的支架内狭窄情况（a）通过OCT数据测量支架内狭窄百分数的计算方法 （b）MPS（金属-高分子复合物支架）植入不同时间的支架直径和管腔直径 （c）MBS（裸铁支架）和MPS植入猪冠脉内6个月和12个月的狭窄率。

The calculation and analysis of in-stent diameter stenosis via OCT. (a) A typical OCT image of the vessel cross-section after implantation of MBS for 12 months and the calculation method of in-stent diameter stenosis of the porcine coronary artery vessel; (b) The calculated in-stent diameter and lumen diameter of MPS as a function of postimplantation time; (c) The histogram of in-stent diameter stenosis. Thirty-four samples were examined with the n values for each group indicated in subsection 2.11. The p values between the in-stent diameter stenosis of MBS and MPS are 0.22 and 0.019 at 6 m and 12 m, respectively, both of which are larger than 0.01. The dashed line indicates 50%, below which the treatment efficacy is usually acceptable in clinic.