To develop an artificial intelligence (AI) system for anatomical recognition that can automatically identify key anatomical structures during bladder neck dissection in robot-assisted radical prostatectomy (RARP), a critical yet technically demanding step.
We constructed an AI model and evaluated its accuracy using 210 RARP videos from two institutions. A total of 1353 frames of bladder neck dissection were extracted from 25 videos, and the boundaries of the prostate, bladder and retrotrigonal layer were annotated. The DeepLabV3+ model was employed in developing the anatomical recognition AI model. An active learning approach was applied by iteratively retraining the model using frames with poor initial performance. The model was further evaluated using 202 independent test frames derived from seven surgeons. Segmentation performance was evaluated using the intersection over union (IoU) and Dice similarity coefficient.
The IoU of the initial AI model was 0.41 for the prostate and 0.44 for the bladder. The retrained model demonstrated improved segmentation performance, with final IoU values of 0.75 and 0.68, respectively. In an independent test dataset derived from seven surgeons, segmentation performance for the prostate and bladder was maintained.
We developed an AI system for anatomical recognition and improved its accuracy by using retraining processes. The retrained AI model demonstrated high accuracy, and its use is anticipated to support surgeons and aid in the education of novice surgeons.
BJU international. 2026 Jul 26 [Epub ahead of print]
Shinnosuke Fujiwara, Keishiro Fukumoto, Masashi Takeuchi, Yuichiro Konnai, Yota Yasumizu, Nobuyuki Tanaka, Toshikazu Takeda, Kazuhiro Matsumoto, Takeo Kosaka, Hirofumi Kawakubo, Masaru Ishida, Yuko Kitagawa, Mototsugu Oya
Department of Urology, Keio University School of Medicine, Tokyo, Japan., Department of Surgery, Keio University School of Medicine, Tokyo, Japan., Department of Urology, Saiseikai Yokohamashi Tobu Hospital, Yokohama-shi, Japan.