Fig. 1. Reconstruction of three dimensional images. (A) Calibration is done with catheter seen on the same image. (B, C) Clicking the narrowest point, proximal and distal reference segment make the lesion lineated automatically. It should be done on two images at least 30 degree apart from each other. (D-F), After finishing (A-C), computer based algorithm is activated and shows three dimensional images and quantitative data.