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

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© The Author(s) 2021

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Fig. 2 — Semiautomatic annotation of the cryo-balloon marker: a original XR image; b XR frame with a rectangular template of 10 × 10 pixels set around the XR marker (red box) and overlaid thresholded pixels corresponding to the segmented marker (incl. close-up of the respective region of interest); c resulting binary mask mask^marker