Examples of the H&N MRI segmentation results by generative adversarial network (GAN), shape constraint (SC)‐DenseNet, SC‐GAN‐ResNet, and SC‐GAN‐DenseNet. The first column shows the ground truth, the second, third, fourth, and fifth columns present the segmentation results by GAN, SC‐DenseNet, SC‐GAN‐ResNet, and SC‐GAN‐DenseNet, respectively. Brainstem (purple), optical chiasm (blue), larynx (orange), mandible (grass green), left and right optical nerves (yellow and light blue), left and right parotid glands (pink and green), pharynx (blue). The single, double, and blunt arrows denote false‐positive islands, undersegmentations, and mis‐segmentations, respectively. [Color figure can be viewed at wileyonlinelibrary.com]