U-Net: Convolutional Networks for Biomedical Image Segmentation
Olaf Ronneberger, Philipp Fischer, and Thomas Brox
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Dense prediction turns histology into explicit objects: tissue compartments, tumour regions, glands, cells, nuclei, boundaries, and phenotypes. These tasks are valuable both as clinical endpoints and as intermediate representations for interpretable pathomics, graph models, spatial biology, and quality control.
Latest literature discovery audit: 2 October 2026. Existing paper reviews retain their individual source-check dates.
Selected ICLR oral addition checked 19 September 2026; the broader literature-review boundary is unchanged.
This route is specific to histology and WSI-derived regions. General segmentation architecture prerequisites are in the computer-vision route; dataset access belongs in the WSI Data Atlas.
“Segmentation” can refer to different prediction contracts.
| Task | Output | Typical reference standard | Useful metrics |
|---|---|---|---|
| Tissue/semantic segmentation | one class per pixel | polygon or pixel mask | class Dice/IoU, boundary score |
| Detection | point or box per object | centres or boxes | precision/recall/F1 under a distance or IoU rule, FROC |
| Instance segmentation | separate mask per object | instance masks | panoptic quality (PQ), aggregated Jaccard, object Dice |
| Instance classification | type per detected instance | typed masks/points | per-class F1, detection-quality × classification-quality |
| Panoptic segmentation | semantic “stuff” plus object “things” | joint labels | PQ and class-stratified errors |
| Counting/density | count or spatial density | objects or stereology | MAE, correlation, calibration by region |
These outputs are not interchangeable. A high semantic Dice can merge touching nuclei; a good detector can localize objects without recovering morphology; and a count can be accurate while cell identities are wrong.
Before training, document:
Use reference standard, not “ground truth,” when labels contain expert judgment or measurement error. Preserve annotator IDs and uncertainty where governance permits it.
Tissue-scale models identify tumour, stroma, epithelium, necrosis, vessels, glands, or other compartments. They supply interpretable areas, define regions for cell analysis, and can constrain slide sampling.
The architectural baseline is U-Net (2015): an encoder–decoder with skip connections that joins context and localization. For pathology, the deeper lesson is to separate three scales:
Gland masks are instances with topology, not merely foreground pixels. Read the GlaS challenge report to see how object-level and boundary errors complicate evaluation. For cell–tissue context, OCELOT provides overlapping local cell and larger-field tissue annotations.
Crowded nuclei create a recurring problem: foreground pixels are easier to predict than the boundary between touching objects. Major solution families include:
| Primary paper | Year / status | Contribution to understand | Main caution |
|---|---|---|---|
| U-Net | 2015 · MICCAI | dense encoder–decoder and skip connections | semantic foreground does not separate instances by itself |
| Cell Detection with Star-Convex Polygons (StarDist) | 2018 · MICCAI | object-centred star-convex shape representation | violated for strongly non-star-convex objects |
| HoVer-Net | 2020 · Medical Image Analysis | joint nuclear pixels, horizontal/vertical maps, and type prediction | post-processing and class taxonomy remain dataset-specific |
| Cellpose | 2021 · Nature Methods | generalist flow-field segmentation across microscopy | broad microscopy generality does not guarantee H&E phenotyping |
| CellViT | 2024 · Medical Image Analysis | ViT/foundation encoder in a HoVer-style instance framework | encoder advantage must be separated from training and decoder choices |
| Segment Anything for Microscopy (μSAM) | 2025 · Nature Methods | promptable and automatic segmentation across microscopy domains | broad microscopy performance is not proof of pathology phenotype validity |
| PathoSAM | 2025 · MIDL oral | automatic and interactive SAM adaptation for histopathology nuclei | prompt protocol and domain transfer are part of the comparison |
| CellSAM | 2025 · Nature Methods | generalist cell segmentation and detection across microscopy | detection, mask quality, and phenotype transfer require separate pathology validation |
| CellViT++ | 2026 · CMPB | decoupled segmentation and data-efficient adaptation to new cell taxonomies | zero-shot masks do not eliminate local phenotype validation |
| Revisiting Foundation Models for Cell Instance Segmentation | 2026 · MIDL, peer reviewed | controlled comparison of Cellpose-SAM, CellSAM, μSAM, and SAM-family variants | a benchmark ranking does not establish one universal winner across pathology sites and phenotypes |
| Pathology foundation models as detection encoders for mitotic figures | 2026 · arXiv preprint | tests frozen PFM features inside a dense mitosis detector, including domain/species transfer; author code | detector, feature level, object density, annotation/matching, and encoder cannot be collapsed into one FM score |
| CellDETR | 2026 · arXiv preprint | uses detection-guided pretraining to learn scalable cell representations from histopathology; author code | the claimed transfer depends on detector targets, tissue distribution, annotation availability, and the currently non-peer-reviewed evidence |
Do not rank these methods using one aggregate number copied from different papers. Compare them with the same resolution, annotation policy, class mapping, post-processing, test patients, and inference budget.
Benchmark papers teach as much about label construction as about algorithms.
| Reading | Year / status | Scale and scientific lesson |
|---|---|---|
| GlaS challenge | 2017 · Medical Image Analysis | colon glands; object shape and malignant architecture make pixel-only evaluation insufficient |
| MoNuSeg challenge | 2020 · IEEE TMI | multi-organ nuclei; tests cross-organ generalization and instance separation |
| PanNuke extension, insights, and baselines | 2020 · dataset paper/preprint | about 200,000 typed nuclei across 19 tissues; broad taxonomy with semi-automatic annotation |
| MoNuSAC2020 | 2021 · IEEE TMI | multi-organ segmentation plus four cell types and challenge-based comparison |
| Lizard | 2021 · ICCV workshop | nearly half a million colon nuclei assembled with pathologist-in-the-loop refinement |
| SegPath | 2023 · Cell Reports Methods | H&E labels derived through destain/restain and IF for eight cell types; supervision can come from another stain |
| OCELOT | 2023 · CVPR | overlapping cell and tissue fields across organs; formalizes context-aware cell detection |
| CoNIC challenge | 2024 · Medical Image Analysis | colon nuclei segmentation, classification, and counting with robustness analysis |
| PathoCellBench | 2025 · MICCAI, peer reviewed | 14 phenotypes and 88M cells; audit registered-multiplex-derived labels, automated processing, and single-center colon domain shift |
Before pooling datasets, reconcile cell taxonomies. “Epithelial,” “neoplastic,”
“connective,” and “stromal” are not universal synonyms. Create a mapping with
exact, broader, ambiguous, and not represented states instead of silently
forcing labels together.
Dense labels are expensive, so annotation tooling is part of the methodology.
Measure expert time per accepted object, disagreement after correction, and the phenotypes underrepresented among rejected suggestions. Automation can bias the final dataset toward objects the proposal model already handles well.
For instance tasks, define:
Report detection quality separately from segmentation quality and phenotype accuracy. PQ is helpful because it combines recognition and mask overlap, but include per-class components so rare cells do not disappear inside a mean.
| Level | Question |
|---|---|
| Object | was each nucleus/cell/gland found, separated, shaped, and typed correctly? |
| Region | are densities, ratios, compartment areas, and spatial arrangements reliable? |
| Patient/slide | does the derived biomarker reproduce across blocks, slides, sites, and scanners? |
Downstream correlation does not validate individual masks, and excellent patch masks do not guarantee an unbiased patient-level biomarker.
Stratify errors by:
Once instances are validated, build interpretable features in registered coordinates:
Avoid thousands of correlated features with a small patient cohort. Define features from a biological question, stabilize them across segmentation perturbations, fit selection inside the training fold, and retain uncertainty from detection and typing. For learned spatial graphs and molecular outcomes, continue to spatial, molecular, and outcome modeling.
Key readings for translating validated objects into biological or patient-level measurements:
| Primary paper | Year / status | Pathomics lesson |
|---|---|---|
| Next-Generation Morphometry | 2023 · Nature Communications, peer reviewed | bridge validated segmented structures to interpretable morphology features and patient-level analysis |
| HistoCell and sCellST | 2025 / 2026 · Nature Communications, peer reviewed | connect nuclei, cell states, topology, and predicted single-cell expression while carrying segmentation/deconvolution uncertainty forward |
| Colon histomorphology transferred to AVANT material | 2025 · Nature Communications, peer reviewed | 47 learned morphology clusters and external trial-material analysis; retrospective trial material is not an AI-guided treatment trial |
Checkpoint: explain semantic, instance, and panoptic segmentation and draw the failure produced by merging two touching nuclei.
Checkpoint: reproduce one matching metric and manually categorize 100 errors as miss, duplicate, split, merge, boundary, or type error.
Checkpoint: test one frozen/adapted model on an unseen site, then determine whether the failure is localization, mask shape, phenotype mapping, or acquisition shift.
unit: pixel | object | region | slide | patientspecimen_and_stain: exact definitioninput_mpp: valuefield_selection: sampling policyreference_standard: annotators, protocol, source stain, uncertaintysplit_unit: patientlabel_taxonomy_version: immutable mappingmodel_and_weights: exact releasepostprocessing: thresholds and parametersmatching_rule: IoU/distance and assignmentmetrics: object + class + region/patientexternal_sites: listfailure_review: sampling and categoriesThe strongest dense-prediction paper is not the one with the longest model name. It is the one whose object definition, labels, matching rule, domain shift, and downstream measurement remain coherent.
TRACE turns trajectory-derived attention boundaries into one-pass predictions through LoRA and an edge decoder. Read its natural-image gains alongside the reported MoNuSeg/TNBC degradation.
| Primary paper · year · evidence | Core idea and why to read it | Official resources |
|---|---|---|
| TRACE: Your Diffusion Model Is Secretly an Instance Edge DetectorSanghyun Jo, Ziseok Lee, Wooyeol Lee, Jonghyun Choi, Jaesik Park, Kyungsu Kim2026 · ICLR · peer-reviewedOfficial ICLR 2026 oral and full proceedings manuscript checked. Diffusion-boundary self-distillation improves selected natural-image segmentation but degrades MoNuSeg/TNBC cell segmentation. One-pass speed is edge extraction only, with the large backbone retained. No WSI or cross-magnification validation; official code/checkpoints remain promised rather than released at the checked revision. | TRACE extracts instance-boundary cues from self-attention inside a pretrained diffusion model, then self-distills a slower trajectory-based edge procedure into one backbone pass. Natural-image mask refinement improves, but the paper also reports worse cell segmentation on MoNuSeg and TNBC. | OpenReview · Official project · Official repository — release pending |
Reading question: Does the teacher prior delineate the target objects before it is distilled, and what remains in the deployed model?
Evidence boundary: A tiny decoder does not remove the large diffusion backbone. Edge-extraction speed is not end-to-end speed, and negative cell-level transfer is not WSI validation.
Compare staged pixel/feature KD from Virchow2, PAGET’s hierarchical multi-teacher pseudo-labels, and ConStruct’s transfer of SegFormer structural affinities into adapted CONCH features for prototype-guided segmentation. Their annotation contracts and deployed components differ.
| Primary paper · year · evidence | Core idea and why to read it | Official resources |
|---|---|---|
| Computationally Efficient Pathology Segmentation using Knowledge Distillation from Foundation ModelsJiaqi Lv, Yijie Zhu, Saki Okada, Maxwell Stanley Renna, Robert Goldin, Stefan Antonowicz, and Shan E Ahmed Raza2026 · arXiv · preprintarXiv v1 (2026-09-03), submitted to Medical Image Analysis according to the authors, not accepted. Verified methods and selected results on 2026-10-02. TIAToolbox is the stated release destination; availability of these exact weights was not independently confirmed. Patch-throughput measurements are not end-to-end WSI latency. | Transfer Virchow2 segmentation knowledge into SegFormerB5 or EUNet-M using a staged combination of pixel predictions and global features. The deployed model is a compact segmentation student, not the foundation-model teacher. This changes model cost at fixed patch input, not optical magnification. | Versioned manuscript · TIAToolbox — stated release destination |
| PAGET: Hierarchical Multi-Teacher Knowledge Distillation for Comprehensive Tumor Microenvironment SegmentationDaisuke Komura, Maki Takao, Mieko Ochi, Takumi Onoyama, Hiroto Katoh, Hiroyuki Abe, Hiroyuki Sano, Teppei Konishi, Toshio Kumasaka, Tomoyuki Yokose, Yohei Miyagi, Tetsuo Ushiku, and Shumpei Ishikawa2026 · MIDL · peer-reviewedPeer-reviewed MIDL 2026 proceedings, PMLR 315:256–279; official record verified 2026-10-02. | PAGET compresses specialized pathology teachers into a SegFormer student that segments 13 tumor-microenvironment components plus background. Its main intervention is taxonomy-aware pseudo-label construction: resolve tissue context, major cell categories, and fine immune subtypes in an explicit order before teaching the student. This is heterogeneous-teacher hard-label distillation, not averaging interchangeable classifiers or matching foundation-model feature vectors. | Official proceedings PDF · Official implementation |
| ConStruct: Structural Distillation of Foundation Models for Prototype-Based Weakly Supervised Histopathology SegmentationKhang Le, Ha Thach, Anh M. Vu, Trang T. K. Vo, Han H. Huynh, David Yang, Minh H. N. Le, Thanh-Huy Nguyen, Akash Awasthi, Chandra Mohan, Zhu Han, and Hien Van Nguyen2026 · MIDL · peer-reviewedPeer-reviewed MIDL 2026 proceedings, PMLR 315:2893–2905; official record verified 2026-10-02. | ConStruct adds spatial organization to a pathology vision–language model for weakly supervised tissue segmentation. A frozen SegFormer teacher supplies token-to-token relations; trainable adapters refine frozen CONCH image features, and text-initialized prototypes turn the refined features into class activation maps. Training needs image-level tissue labels rather than dense pixel masks. The reported experiment is on BCSS-WSSS patches, not a whole-slide classification or cross-magnification benchmark. | Official proceedings PDF · Official implementation |
Reading question: Which supervision remains observable at student resolution, and which teacher or post-processing components still run at inference?
Evidence boundary: PAGET-H retains HoverNet. ConStruct’s residual adapters are not residual-error targets. Pixel segmentation, patch throughput and patient-level WSI outcomes are distinct evidence.
SpaPath-Bench compares frozen image features through a controlled spatial learner and clustering readout on paired histology–ST sections. Its three reference regimes expose different strengths: a smooth partition, a transcriptomic proxy, and an expert anatomical boundary are not interchangeable targets.
| Primary paper · year · evidence | Core idea and why to read it | Official resources |
|---|---|---|
| Benchmarking Pathology Foundation Models for Spatial Domain UnderstandingBokai Zhao, Yiyang Zhang, Yuanchi Zhu, Hanqing Chao, Long Bai, Tai Ma, Minfeng Xu, Ming Song, and Tianzi Jiang2026 · MICCAI · peer-reviewedMICCAI 2026 chapter, LNCS 16895, pages 35–45, first online 25 September 2026; the volume imprint says 2027. Review uses the inspected publisher PDF. The 42 slides comprise 12 expert-annotated DLPFC slides and 30 slides assessed using transcriptomic clustering proxies. The linked public repository is a prepared-results dashboard, not a verified end-to-end benchmark implementation. | SpaPath-Bench asks whether frozen pathology features support meaningful tissue partitions after a controlled spatial readout. It compares 19 encoders on 42 paired H&E–spatial-transcriptomics slides, separating spatial coherence, molecular-partition agreement and expert-label agreement. The evaluated object is an encoder-plus-readout system, not innate global spatial reasoning by a local tile encoder. | Publisher full chapter · Official MICCAI open-access record · Official accepted manuscript · Author results dashboard · Dashboard repository and documented limits |
Reading question: Which spatial relationship is preserved, and how much is supplied by the readout rather than the encoder?
Evidence boundary: Only 12 DLPFC slides carry expert labels; the other 30 use molecular clustering proxies. Repeated configurations are not independent specimens, and single-slide visual examples are not cohort means.
47 canonical readings · 2015–2026· route reviewed through October 2, 2026.
This is the complete structured list for this chapter, ordered chronologically from earlier foundations toward current work. The explanatory ladder above highlights the shortest conceptual route; this list also includes important branches, benchmarks, and current endpoints. It is generated from the same deduplicated catalog used by the AI background registry and My Library, so a future catalog update appears here automatically.
Olaf Ronneberger, Philipp Fischer, and Thomas Brox
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Sirinukunwattana et al.
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Schmidt et al.
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Graham et al.
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Kumar et al.
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Gamper et al.
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Alemi Koohbanani et al.
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Stringer et al.
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Graham et al.
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Verma et al.
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Joseph DiPalma, Arief A. Suriawinata, Laura J. Tafe, Lorenzo Torresani, and Saeed Hassanpour
Peer-reviewed journal article 119:102136.
Official artifacts: Open-access article · Author manuscript
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Jiawei Yang, Hanbo Chen, Yuan Liang, Junzhou Huang, Lei He, and Jianhua Yao
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Ryu et al.
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Komura et al.
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David L. Hölscher et al.
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Marc Aubreville et al.
Peer-reviewed Medical Image Analysis article 84:102699; published online 23 November 2022 and assigned to the 2023 volume.
Official artifacts: Author manuscript · Official challenge and data · Reference container
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Marco Aversa, Gabriel Nobis, Miriam Hägele, Kai Standvoss, Mihaela Chirica, Roderick Murray-Smith, Ahmed M. Alaa, Lukas Ruff, Daniela Ivanova, Wojciech Samek, Frederick Klauschen, Bruno Sanguinetti, and Luis Oala
Official artifacts: Author preprint · Official code
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Rocío del Amor, Julio Silva-Rodríguez, Adrián Colomer, and Valery Naranjo
Peer-reviewed EUSIPCO 2023 proceedings paper, pages 985–989.
Official artifacts: Open proceedings paper · Official code
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Sajid Javed, Arif Mahmood, Talha Qaiser, and Naoufel Werghi
Peer-reviewed journal article 27(4):2037–2046.
Official artifacts: Open author manuscript
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Songhui Diao, Weiren Luo, Jiaxin Hou, Ricardo Lambo, Hamas A. AL-kuhali, Hanqing Zhao, Yinli Tian, Yaoqin Xie, Nazar Zaki, and Wenjian Qin
Peer-reviewed journal article 27(3):1535–1545. DMSL learns paired same-field-of-view patch features at two magnifications and retains both magnification branches at inference; its reported comparison metrics are patch-level, not a WSI endpoint.
Official artifacts: PubMed record
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Graham et al.
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Hörst et al.
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Griebel et al.
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Jiao Tang et al.
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Jérôme Lüscher et al.
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Anwai Archit et al.
Published online in 2024 and assigned to the 2025 volume.
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Markus Marks et al.
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Peng Zhang et al.
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Bojing Liu et al.
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Meilong Xu, Saumya Gupta, Xiaoling Hu, Chen Li, Shahira Abousamra, Dimitris Samaras, Prateek Prasanna, and Chao Chen
Official artifacts: Official code
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Mahesh Bhosale, Abdul Wasi, Yuanhao Zhai, Yunjie Tian, Samuel Border, Nan Xi, Pinaki Sarder, Junsong Yuan, David Doermann, and Xuan Gong
Official artifacts: Official code
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Saghir Alfasly, Wataru Uegami, Md Enamul Hoq, Ghazal Alabtah, and Hamid Tizhoosh
Official artifacts: Author preprint
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Muzhou Yu, Zihan Zhong, Xingang Zhou, Yuekun Wang, Tingyu Liang, Jiamin Chen, Hongmin Huang, Junhan Zhou, Dachun Zhao, Bo Lei, Yu Wang, Wenbin Ma, and Kaisheng Ma
Peer-reviewed open-access journal article 15:42124. Low- and high-magnification language motivates the design, but HVisKD transfers sample- and region-relation features between teacher and student given the same pathology patches; it is not cross-magnification distillation.
Official artifacts: Open-access article · Official code
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Hörst et al.
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Anwai Archit and Constantin Pape
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Loïc Chadoutaud et al.
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Sweta Banerjee et al.
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Zhiwen Xu, Xiaoming Yan, Chengkun Wu, Juan Chen, Haoang Chi, and Liyang Xu
The arXiv record reports acceptance at ACM Multimedia 2026. The proceedings record was not yet available when checked on 2026-08-08.
Official artifacts: Official code
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Shikang Zhang, Guojun Li, Yicong Mao, and Chulin Sha
The official implementation describes a NeurIPS 2026 submission; no acceptance or proceedings record was available when checked on 2026-08-10.
Official artifacts: Official code
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Tiffanie Godelaine, Maxime Zanella, Karim El Khoury, Benoit Macq, and Christophe De Vleeschouwer
arXiv v1 submitted 31 August 2026; the manuscript title page says it was submitted on 29 July 2026. Code and data instructions were released, but no peer-reviewed record was verified on 2 September 2026.
Official artifacts: Official implementation and data instructions
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Aarv Mankodi, Praveen Kumar Shukla, and Hitesh Tekchandani
Peer-reviewed open-access journal article 16:20721. A MobileViT-XS is sequentially adapted from 40× through 400× using the previous checkpoint as teacher; BreakHis consists of biopsy images rather than WSIs, and the same-capacity teacher/student design targets retention rather than model compression.
Official artifacts: Open-access article
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Agnieszka Florkowska, Henning Müller, and Marek Wodzinski
arXiv v1 submitted 10 August 2026; no peer-reviewed venue was verified on 2026-09-02. A single CNN is conditioned on physical pixel size and trained over a continuous magnification range; each prediction still consumes one patch scale and the method is neither MIL nor knowledge distillation.
Official artifacts: Official code
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Daisuke Komura, Maki Takao, Mieko Ochi, Takumi Onoyama, Hiroto Katoh, Hiroyuki Abe, Hiroyuki Sano, Teppei Konishi, Toshio Kumasaka, Tomoyuki Yokose, Yohei Miyagi, Tetsuo Ushiku, and Shumpei Ishikawa
Peer-reviewed MIDL 2026 proceedings, PMLR 315:256–279; official record verified 2026-10-02.
Official artifacts: Official proceedings PDF · Official implementation
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Khang Le, Ha Thach, Anh M. Vu, Trang T. K. Vo, Han H. Huynh, David Yang, Minh H. N. Le, Thanh-Huy Nguyen, Akash Awasthi, Chandra Mohan, Zhu Han, and Hien Van Nguyen
Peer-reviewed MIDL 2026 proceedings, PMLR 315:2893–2905; official record verified 2026-10-02.
Official artifacts: Official proceedings PDF · Official implementation
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Jiaqi Lv, Yijie Zhu, Saki Okada, Maxwell Stanley Renna, Robert Goldin, Stefan Antonowicz, and Shan E Ahmed Raza
arXiv v1 (2026-09-03), submitted to Medical Image Analysis according to the authors, not accepted. Verified methods and selected results on 2026-10-02. TIAToolbox is the stated release destination; availability of these exact weights was not independently confirmed. Patch-throughput measurements are not end-to-end WSI latency.
Official artifacts: Versioned manuscript · TIAToolbox — stated release destination
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Bokai Zhao, Yiyang Zhang, Yuanchi Zhu, Hanqing Chao, Long Bai, Tai Ma, Minfeng Xu, Ming Song, and Tianzi Jiang
MICCAI 2026 chapter, LNCS 16895, pages 35–45, first online 25 September 2026; the volume imprint says 2027. Review uses the inspected publisher PDF. The 42 slides comprise 12 expert-annotated DLPFC slides and 30 slides assessed using transcriptomic clustering proxies. The linked public repository is a prepared-results dashboard, not a verified end-to-end benchmark implementation.
Official artifacts: Publisher full chapter · Official MICCAI open-access record · Official accepted manuscript · Author results dashboard · Dashboard repository and documented limits
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Sanghyun Jo, Ziseok Lee, Wooyeol Lee, Jonghyun Choi, Jaesik Park, Kyungsu Kim
Official ICLR 2026 oral and full proceedings manuscript checked. Diffusion-boundary self-distillation improves selected natural-image segmentation but degrades MoNuSeg/TNBC cell segmentation. One-pass speed is edge extraction only, with the large backbone retained. No WSI or cross-magnification validation; official code/checkpoints remain promised rather than released at the checked revision.
Official artifacts: OpenReview · Official project · Official repository — release pending
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