Mitotic figures (MFs) are relevant biomarkers in tumor grading. Differentiating atypical MFs (AMFs) from normal MFs (NMFs) remains difficult, as manual annotation is time-consuming and subjective. In this work an ensemble of ConvNeXtBase models was trained with AUCMEDI and extend with a rule-based refinement (RBR) module. On the MIDOG25 preliminary test set, the ensemble achieved a balanced accuracy of 84.02%. While the RBR increased specificity, it reduced sensitivity and overall performance. The results show that deep ensembles perform well for AMF classification. RBR can increase specific metrics but requires further research.
@article{arxiv.2508.20919,
title = {Classifying Mitotic Figures in the MIDOG25 Challenge with Deep Ensemble Learning and Rule Based Refinement},
author = {Sara Krauss and Ellena Spieß and Daniel Hieber and Frank Kramer and Johannes Schobel and Dominik Müller},
journal= {arXiv preprint arXiv:2508.20919},
year = {2025}
}
Comments
Submission as part of the MICCAI MIDOG25 challenge