Deep-learning-based automatic liver segmentation using computed tomography images in dogs

Seungyeon Lee¹Genya Shimbo¹Nozomu Yokoyama¹Kensuke Nakamura¹Ren Togo²Takahiro Ogawa²Miki Haseyama²Mitsuyoshi TAKIGUCHI^1*

• ¹Hokkaido Daigaku Juigakubu Daigakuin Juigaku Kenkyuka, Sapporo, Japan
• ²Hokkaido Daigaku Daigakuin Joho Kagaku Kenkyuka, Sapporo, Japan

Deep learning-based automated segmentation has significantly improved the efficiency and accuracy of human medicine applications. However, veterinary applications, particularly canine liver segmentation, remain limited. This study aimed to develop and validate a deep learning model based on a 3D U-Net architecture for automated liver segmentation in canine abdominal computed tomography (CT) scans. A total of 221 canine abdominal CT scans were analyzed, comprising 159 cases without hepatic masses and 62 cases with hepatic masses. The model was trained and evaluated using two separate datasets: one containing cases without hepatic masses (Experiment 1) and the other combining cases with and without hepatic masses (Experiment 2). Both experiments demonstrated high segmentation performance, achieving mean Dice similarity coefficients of 0.926 (Experiment 1) and 0.929 (Experiment 2). The manual and predicted liver volumes showed excellent agreement, highlighting the potential clinical applicability of this approach.