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. 2021 Apr 20;16(8):1255–1262. doi: 10.1007/s11548-021-02366-5

Fig. 3.

Fig. 3

Semiautomatic annotation of the cryo-balloon catheter shaft: a original XR image; b skeletonized binary image with the analytical graph (magenta) built within the 50 × 50 pixels ROI (red rectangular box) around the seed point (red point) and two end nodes (white points) indicating the longest path closest to the seed point and interpreted as a catheter shaft; c XR frame with overlaid resulting spline fitted longest path providing the centerline of the catheter shaft; d resulting binary mask maskshaft ctrl