Fig. 1. Experimental setup of intravascular optical coherence tomography system (SS is swept source; MC is motion controller, namely, rotary junction and pull back device; DAQ is data acquisition card; BPD is balanced photo detector; RVDL is reflected variable optical delay line)

Fig. 2. Stent and vessel can be identified by the summary of 100 pixels behind the vessel boundary. (a) Dark zone behind the metal stent; (b) summary of 100 pixels behind the vessel boundary

Fig. 3. Schematics of stents reconstruction(the left and right columns are two reconstruction methods of two stents)

Fig. 4. Flow chart of coronary stent reconstruction in IVOCT. (a) Polyvinyl alcohol tubes and drug-eluting coronary stents cross-sectional IVOCT image; (b) polar IVOCT image; (c) image after filtering and enhancing; (d) boundary segmentation result; (e) one-dimensional array after projection (for better display, Fig.4(e) is rotated 90° clockwise relative to Fig.4(d)); (f) stent reconstruction image generated by the one-dimensional

Fig. 5. Microscopy image and reconstruction images of stent. (a) Microscopy image of stent, the minimal interval of the cell is about 145 μm; (b) reconstruction image of stent with the pullback speed of 20 mm/s; (c) reconstruction image of stent with the pullback speed of 10 mm/s; (d) reconstruction image of stent with the pullback speed of 5 mm/s

Fig. 6. Microscopy image and reconstruction images of CSF, and the arrow points to broken of cell and the oval circle shows the broken connector. (a) Microscopy image of CSF, and the fracture length in the cell is about 0.8 mm and the fracture length of the connector is about 0.19 mm; (b) reconstruction image of stent with the pullback speed of 20 mm/s; (c) reconstruction image of stent with the pullback speed of 10 mm/s; (d) reconstruction image of stent with the pullback speed of 5 mm/s