activity
20222026
most citedExtreme Cardiac MRI Analysis under Respiratory Motion: Results of the CMRxMotion Challenge

5 citations · 7 across the 15 of their papers we have counts for

collaborators

15 papers

cs.CV2026

Applications of Neural Cellular Automata: State of the Art, Challenges and Opportunities

Nick Lemke, Niklas Ihm, John Kalkhof +11

Neural Cellular Automata (NCAs) are a new type of neural network architecture which enable accurate and robust inference at extremely small model sizes. Recently, NCAs have advance…

cs.CV2026

Sterilizable Scene Graph Generation for Operating Rooms

Nick Lemke, Ssharvien Kumar Sivakumar, Antoine P. Sanner +4

Scene graph generation from surgical video enables a holistic and structured understanding of surgical scenes by modeling objects and their semantic relationships. Despite recent a…

cs.CV2026

SMART: A Flexible, Interpretable, and Scalable Spatio-temporal Brain Atlas from High-Resolution Imaging Data

John Kalkhof, Boris Gutman, Emile d'Angremont +2

We introduce SMART, a framework for learning a flexible, interpretable, and scalable spatio-temporal brain atlas from longitudinal high-resolution 3D medical images. Existing appro…

cs.CV2025

OctreeNCA: Single-Pass 184 MP Segmentation on Consumer Hardware

Nick Lemke, John Kalkhof, Niklas Babendererde +1

Medical applications demand segmentation of large inputs, like prostate MRIs, pathology slices, or videos of surgery. These inputs should ideally be inferred at once to provide the…

eess.IV2025★ 5 cited

Extreme Cardiac MRI Analysis under Respiratory Motion: Results of the CMRxMotion Challenge

Kang Wang, Chen Qin, Zhang Shi +46

Deep learning models have achieved state-of-the-art performance in automated Cardiac Magnetic Resonance (CMR) analysis. However, the efficacy of these models is highly dependent on…

cs.CV2025

Equitable Federated Learning with NCA

Nick Lemke, Mirko Konstantin, Henry John Krumb +3

Federated Learning (FL) is enabling collaborative model training across institutions without sharing sensitive patient data. This approach is particularly valuable in low- and midd…

cs.CV2025★ 1 cited

MedSegDiffNCA: Diffusion Models With Neural Cellular Automata for Skin Lesion Segmentation

Avni Mittal, John Kalkhof, Anirban Mukhopadhyay +1

Denoising Diffusion Models (DDMs) are widely used for high-quality image generation and medical image segmentation but often rely on Unet-based architectures, leading to high compu…

eess.IV2024

NCAdapt: Dynamic adaptation with domain-specific Neural Cellular Automata for continual hippocampus segmentation

Amin Ranem, John Kalkhof, Anirban Mukhopadhyay

Continual learning (CL) in medical imaging presents a unique challenge, requiring models to adapt to new domains while retaining previously acquired knowledge. We introduce NCAdapt…

cs.CV2024

NCA-Morph: Medical Image Registration with Neural Cellular Automata

Amin Ranem, John Kalkhof, Anirban Mukhopadhyay

Medical image registration is a critical process that aligns various patient scans, facilitating tasks like diagnosis, surgical planning, and tracking. Traditional optimization bas…

cs.LG2024

Unsupervised Training of Neural Cellular Automata on Edge Devices

John Kalkhof, Amin Ranem, Anirban Mukhopadhyay

The disparity in access to machine learning tools for medical imaging across different regions significantly limits the potential for universal healthcare innovation, particularly…

cs.CV2024★ 1 cited

Frequency-Time Diffusion with Neural Cellular Automata

John Kalkhof, Arlene Kühn, Yannik Frisch +1

Despite considerable success, large Denoising Diffusion Models (DDMs) with UNet backbone pose practical challenges, particularly on limited hardware and in processing gigapixel ima…

cs.CV2023

M3D-NCA: Robust 3D Segmentation with Built-in Quality Control

John Kalkhof, Anirban Mukhopadhyay

Medical image segmentation relies heavily on large-scale deep learning models, such as UNet-based architectures. However, the real-world utility of such models is limited by their…

eess.IV2023

Med-NCA: Robust and Lightweight Segmentation with Neural Cellular Automata

John Kalkhof, Camila González, Anirban Mukhopadhyay

Access to the proper infrastructure is critical when performing medical image segmentation with Deep Learning. This requirement makes it difficult to run state-of-the-art segmentat…

eess.IV2022

Detecting respiratory motion artefacts for cardiovascular MRIs to ensure high-quality segmentation

Amin Ranem, John Kalkhof, Caner Özer +2

While machine learning approaches perform well on their training domain, they generally tend to fail in a real-world application. In cardiovascular magnetic resonance imaging (CMR)…

eess.IV2022

Disentanglement enables cross-domain Hippocampus Segmentation

John Kalkhof, Camila González, Anirban Mukhopadhyay

Limited amount of labelled training data are a common problem in medical imaging. This makes it difficult to train a well-generalised model and therefore often leads to failure in…