FIGURE 3.

Transverse contrast‐enhanced CT image acquired in sternal recumbency (window width = 450, level = 140, 120 kVp, 280 mA) at the level of the atlanto‐occipital transition of a 12‐year‐old Golden Retriever (A) showing the medial retropharyngeal lymph nodes (white arrowheads). Input image for U‐Net (B) and corresponding output image (C). The pixels identified by U‐Net as medial retropharyngeal lymph nodes are highlighted in image (C). Image (C) shows inaccurate segmentation of the right medial retropharyngeal lymph node as the adjacent carotid artery, and the medial contour of the right mandibular salivary gland is highlighted as well