Figure 8c: Contrast-enhanced retrospectively ECG-gated 64-section coronary CT angiography in 59-year-old man referred for noninvasive assessment of coronary artery stent patency. Reconstructions of the data set with (a, b) a routine coronary CT angiography algorithm and (c, d) a more edge-enhancing algorithm dedicated to assessment of the coronary artery stents and segments with severe calcification are shown. (a, c) Curved MPRs show two coronary artery stents in the distal RCA. (b, d) Oblique MPRs perpendicular to the centerline of the vessel are reconstructed at the level of the distal stent. The proximal stent (open arrow in a and c) can be readily assessed with both reconstruction techniques owing to its filamentous strut structure. The high-attenuating struts of the more distal bare metal stent (solid arrow in a and c) cause excessive streak artifacts at routine reconstruction (a and b) such that patency and areas of intimal hyperplasia, seen as hypoattenuating areas on the inside of the stent (arrow in d), can be appreciated only with use of the dedicated reconstruction algorithm (c and d).