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. 2023 May 9;33(10):6746–6755. doi: 10.1007/s00330-023-09668-z

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Fig. 4 — Visual explanations (Grad-CAM++ heatmaps) of the automatic detection results by the proposed model. a, a′ True-positive case with a high burden of BAC in multiple vessels; b, b′ true-positive case with small BAC (arrows); c, c′ true-negative case with confounding factors, i.e. various benign calcifications (none of the structures colored on the heatmap reaches the threshold for being finally detected as BAC)