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45-year-old male patient with episodes of atypical chest pain during physical exertion undergoing sequential mode CCTA. Small (grade 2) stair step artifacts can be seen in the proximal RCA in standard mode reconstructions (a, yellow line), which is resolved with the ZeeFree algorithm (c). Vessel center-line and lumen contouring for CTFFR analyses (b,d). CTFFR indicated similarly physiologic values (0.99) at the level of the stair-step artifact in both reconstructions (e,f).
