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Background Optical coherence tomography (OCT) is kind of coronary imaging technology with high resolution.OCT can be used to assess the efficacy and degradation process of poly-L-lactic acid (PLLA) scaffold.In this study,XINSORB scaffolds (fully bioabsorbable poly-L-lactic acid (PLLA) sirolimus-eluting scaffold, designed and fabricated by Shanghai Weite Biotech, CO.; Ltd.) along with 316L stainless steel based EXCEL stent (purchased from Shangdong Jiwei CO.; Ltd.) were implanted into porcine coronary arteries.