Search Results for author: Georgios Kaissis

Found 43 papers, 20 papers with code

Robust Detection Outcome: A Metric for Pathology Detection in Medical Images

1 code implementation3 Mar 2023 Felix Meissen, Philip Müller, Georgios Kaissis, Daniel Rueckert

To tackle this problem, we propose Robust Detection Outcome (RoDeO); a novel metric for evaluating algorithms for pathology detection in medical images, especially in chest X-rays.

object-detection Object Detection

Unsupervised Pathology Detection: A Deep Dive Into the State of the Art

1 code implementation1 Mar 2023 Ioannis Lagogiannis, Felix Meissen, Georgios Kaissis, Daniel Rueckert

Our experiments demonstrate that newly developed feature-modeling methods from the industrial and medical literature achieve increased performance compared to previous work and set the new SOTA in a variety of modalities and datasets.

Unsupervised Anomaly Detection

Equivariant Differentially Private Deep Learning

no code implementations30 Jan 2023 Florian A. Hölzl, Daniel Rueckert, Georgios Kaissis

The formal privacy guarantee provided by Differential Privacy (DP) bounds the leakage of sensitive information from deep learning models.

Data Augmentation Image Classification

How Do Input Attributes Impact the Privacy Loss in Differential Privacy?

no code implementations18 Nov 2022 Tamara T. Mueller, Stefan Kolek, Friederike Jungmann, Alexander Ziller, Dmitrii Usynin, Moritz Knolle, Daniel Rueckert, Georgios Kaissis

Differential privacy (DP) is typically formulated as a worst-case privacy guarantee over all individuals in a database.

Exploiting segmentation labels and representation learning to forecast therapy response of PDAC patients

no code implementations8 Nov 2022 Alexander Ziller, Ayhan Can Erdur, Friederike Jungmann, Daniel Rueckert, Rickmer Braren, Georgios Kaissis

The prediction of pancreatic ductal adenocarcinoma therapy response is a clinically challenging and important task in this high-mortality tumour entity.

Representation Learning

Generalised Likelihood Ratio Testing Adversaries through the Differential Privacy Lens

no code implementations24 Oct 2022 Georgios Kaissis, Alexander Ziller, Stefan Kolek Martinez de Azagra, Daniel Rueckert

Differential Privacy (DP) provides tight upper bounds on the capabilities of optimal adversaries, but such adversaries are rarely encountered in practice.

Label Noise-Robust Learning using a Confidence-Based Sieving Strategy

no code implementations11 Oct 2022 Reihaneh Torkzadehmahani, Reza Nasirigerdeh, Daniel Rueckert, Georgios Kaissis

Identifying the samples with corrupted labels and preventing the model from learning them is a promising approach to address this challenge.

Bridging the Gap: Differentially Private Equivariant Deep Learning for Medical Image Analysis

no code implementations9 Sep 2022 Florian A. Hölzl, Daniel Rueckert, Georgios Kaissis

Machine learning with formal privacy-preserving techniques like Differential Privacy (DP) allows one to derive valuable insights from sensitive medical imaging data while promising to protect patient privacy, but it usually comes at a sharp privacy-utility trade-off.

Privacy Preserving

Unsupervised Anomaly Localization with Structural Feature-Autoencoders

1 code implementation23 Aug 2022 Felix Meissen, Johannes Paetzold, Georgios Kaissis, Daniel Rueckert

Most commonly, the anomaly detection model generates a "normal" version of an input image, and the pixel-wise $l^p$-difference of the two is used to localize anomalies.

Unsupervised Anomaly Detection

Kernel Normalized Convolutional Networks

no code implementations20 May 2022 Reza Nasirigerdeh, Reihaneh Torkzadehmahani, Daniel Rueckert, Georgios Kaissis

Existing deep convolutional neural network (CNN) architectures frequently rely upon batch normalization (BatchNorm) to effectively train the model.

Federated Learning

SmoothNets: Optimizing CNN architecture design for differentially private deep learning

1 code implementation9 May 2022 Nicolas W. Remerscheid, Alexander Ziller, Daniel Rueckert, Georgios Kaissis

The arguably most widely employed algorithm to train deep neural networks with Differential Privacy is DPSGD, which requires clipping and noising of per-sample gradients.

Image Classification with Differential Privacy

Beyond Gradients: Exploiting Adversarial Priors in Model Inversion Attacks

no code implementations1 Mar 2022 Dmitrii Usynin, Daniel Rueckert, Georgios Kaissis

Collaborative machine learning settings like federated learning can be susceptible to adversarial interference and attacks.

Federated Learning

Differentially private training of residual networks with scale normalisation

no code implementations1 Mar 2022 Helena Klause, Alexander Ziller, Daniel Rueckert, Kerstin Hammernik, Georgios Kaissis

The training of neural networks with Differentially Private Stochastic Gradient Descent offers formal Differential Privacy guarantees but introduces accuracy trade-offs.

Multi-modal unsupervised brain image registration using edge maps

no code implementations9 Feb 2022 Vasiliki Sideri-Lampretsa, Georgios Kaissis, Daniel Rueckert

Diffeomorphic deformable multi-modal image registration is a challenging task which aims to bring images acquired by different modalities to the same coordinate space and at the same time to preserve the topology and the invertibility of the transformation.

Image Registration

On the Pitfalls of Using the Residual Error as Anomaly Score

1 code implementation8 Feb 2022 Felix Meissen, Benedikt Wiestler, Georgios Kaissis, Daniel Rueckert

Many current state-of-the-art methods for anomaly localization in medical images rely on calculating a residual image between a potentially anomalous input image and its "healthy" reconstruction.

Differentially Private Graph Classification with GNNs

no code implementations5 Feb 2022 Tamara T. Mueller, Johannes C. Paetzold, Chinmay Prabhakar, Dmitrii Usynin, Daniel Rueckert, Georgios Kaissis

In this work, we introduce differential privacy for graph-level classification, one of the key applications of machine learning on graphs.

BIG-bench Machine Learning Classification +1

AutoSeg -- Steering the Inductive Biases for Automatic Pathology Segmentation

1 code implementation24 Jan 2022 Felix Meissen, Georgios Kaissis, Daniel Rueckert

In medical imaging, un-, semi-, or self-supervised pathology detection is often approached with anomaly- or out-of-distribution detection methods, whose inductive biases are not intentionally directed towards detecting pathologies, and are therefore sub-optimal for this task.

Out-of-Distribution Detection

Distributed Machine Learning and the Semblance of Trust

no code implementations21 Dec 2021 Dmitrii Usynin, Alexander Ziller, Daniel Rueckert, Jonathan Passerat-Palmbach, Georgios Kaissis

The utilisation of large and diverse datasets for machine learning (ML) at scale is required to promote scientific insight into many meaningful problems.

BIG-bench Machine Learning Federated Learning +1

Joint Learning of Localized Representations from Medical Images and Reports

1 code implementation6 Dec 2021 Philip Müller, Georgios Kaissis, Congyu Zou, Daniel Rueckert

Contrastive learning has proven effective for pre-training image models on unlabeled data with promising results for tasks such as medical image classification.

Contrastive Learning Medical Image Classification +4

An automatic differentiation system for the age of differential privacy

no code implementations22 Sep 2021 Dmitrii Usynin, Alexander Ziller, Moritz Knolle, Andrew Trask, Kritika Prakash, Daniel Rueckert, Georgios Kaissis

We introduce Tritium, an automatic differentiation-based sensitivity analysis framework for differentially private (DP) machine learning (ML).

BIG-bench Machine Learning

A unified interpretation of the Gaussian mechanism for differential privacy through the sensitivity index

no code implementations22 Sep 2021 Georgios Kaissis, Moritz Knolle, Friederike Jungmann, Alexander Ziller, Dmitrii Usynin, Daniel Rueckert

$\psi$ uniquely characterises the GM and its properties by encapsulating its two fundamental quantities: the sensitivity of the query and the magnitude of the noise perturbation.

Partial sensitivity analysis in differential privacy

1 code implementation22 Sep 2021 Tamara T. Mueller, Alexander Ziller, Dmitrii Usynin, Moritz Knolle, Friederike Jungmann, Daniel Rueckert, Georgios Kaissis

However, while techniques such as individual R\'enyi DP (RDP) allow for granular, per-person privacy accounting, few works have investigated the impact of each input feature on the individual's privacy loss.

Image Classification

Challenging Current Semi-Supervised Anomaly Segmentation Methods for Brain MRI

1 code implementation13 Sep 2021 Felix Meissen, Georgios Kaissis, Daniel Rueckert

In this work, we tackle the problem of Semi-Supervised Anomaly Segmentation (SAS) in Magnetic Resonance Images (MRI) of the brain, which is the task of automatically identifying pathologies in brain images.

Anomaly Detection

Whole Brain Vessel Graphs: A Dataset and Benchmark for Graph Learning and Neuroscience (VesselGraph)

1 code implementation30 Aug 2021 Johannes C. Paetzold, Julian McGinnis, Suprosanna Shit, Ivan Ezhov, Paul Büschl, Chinmay Prabhakar, Mihail I. Todorov, Anjany Sekuboyina, Georgios Kaissis, Ali Ertürk, Stephan Günnemann, Bjoern H. Menze

Moreover, we benchmark numerous state-of-the-art graph learning algorithms on the biologically relevant tasks of vessel prediction and vessel classification using the introduced vessel graph dataset.

Graph Learning

NeuralDP Differentially private neural networks by design

no code implementations30 Jul 2021 Moritz Knolle, Dmitrii Usynin, Alexander Ziller, Marcus R. Makowski, Daniel Rueckert, Georgios Kaissis

The application of differential privacy to the training of deep neural networks holds the promise of allowing large-scale (decentralized) use of sensitive data while providing rigorous privacy guarantees to the individual.

Sensitivity analysis in differentially private machine learning using hybrid automatic differentiation

no code implementations9 Jul 2021 Alexander Ziller, Dmitrii Usynin, Moritz Knolle, Kritika Prakash, Andrew Trask, Rickmer Braren, Marcus Makowski, Daniel Rueckert, Georgios Kaissis

Reconciling large-scale ML with the closed-form reasoning required for the principled analysis of individual privacy loss requires the introduction of new tools for automatic sensitivity analysis and for tracking an individual's data and their features through the flow of computation.

BIG-bench Machine Learning

Differentially private federated deep learning for multi-site medical image segmentation

1 code implementation6 Jul 2021 Alexander Ziller, Dmitrii Usynin, Nicolas Remerscheid, Moritz Knolle, Marcus Makowski, Rickmer Braren, Daniel Rueckert, Georgios Kaissis

The application of PTs to FL in medical imaging and the trade-offs between privacy guarantees and model utility, the ramifications on training performance and the susceptibility of the final models to attacks have not yet been conclusively investigated.

Federated Learning Image Segmentation +3

U-Noise: Learnable Noise Masks for Interpretable Image Segmentation

1 code implementation14 Jan 2021 Teddy Koker, FatemehSadat Mireshghallah, Tom Titcombe, Georgios Kaissis

Deep Neural Networks (DNNs) are widely used for decision making in a myriad of critical applications, ranging from medical to societal and even judicial.

Decision Making Image Segmentation +1

Efficient, high-performance pancreatic segmentation using multi-scale feature extraction

1 code implementation2 Sep 2020 Moritz Knolle, Georgios Kaissis, Friederike Jungmann, Sebastian Ziegelmayer, Daniel Sasse, Marcus Makowski, Daniel Rueckert, Rickmer Braren

For artificial intelligence-based image analysis methods to reach clinical applicability, the development of high-performance algorithms is crucial.

The Liver Tumor Segmentation Benchmark (LiTS)

6 code implementations13 Jan 2019 Patrick Bilic, Patrick Christ, Hongwei Bran Li, Eugene Vorontsov, Avi Ben-Cohen, Georgios Kaissis, Adi Szeskin, Colin Jacobs, Gabriel Efrain Humpire Mamani, Gabriel Chartrand, Fabian Lohöfer, Julian Walter Holch, Wieland Sommer, Felix Hofmann, Alexandre Hostettler, Naama Lev-Cohain, Michal Drozdzal, Michal Marianne Amitai, Refael Vivantik, Jacob Sosna, Ivan Ezhov, Anjany Sekuboyina, Fernando Navarro, Florian Kofler, Johannes C. Paetzold, Suprosanna Shit, Xiaobin Hu, Jana Lipková, Markus Rempfler, Marie Piraud, Jan Kirschke, Benedikt Wiestler, Zhiheng Zhang, Christian Hülsemeyer, Marcel Beetz, Florian Ettlinger, Michela Antonelli, Woong Bae, Míriam Bellver, Lei Bi, Hao Chen, Grzegorz Chlebus, Erik B. Dam, Qi Dou, Chi-Wing Fu, Bogdan Georgescu, Xavier Giró-i-Nieto, Felix Gruen, Xu Han, Pheng-Ann Heng, Jürgen Hesser, Jan Hendrik Moltz, Christian Igel, Fabian Isensee, Paul Jäger, Fucang Jia, Krishna Chaitanya Kaluva, Mahendra Khened, Ildoo Kim, Jae-Hun Kim, Sungwoong Kim, Simon Kohl, Tomasz Konopczynski, Avinash Kori, Ganapathy Krishnamurthi, Fan Li, Hongchao Li, Junbo Li, Xiaomeng Li, John Lowengrub, Jun Ma, Klaus Maier-Hein, Kevis-Kokitsi Maninis, Hans Meine, Dorit Merhof, Akshay Pai, Mathias Perslev, Jens Petersen, Jordi Pont-Tuset, Jin Qi, Xiaojuan Qi, Oliver Rippel, Karsten Roth, Ignacio Sarasua, Andrea Schenk, Zengming Shen, Jordi Torres, Christian Wachinger, Chunliang Wang, Leon Weninger, Jianrong Wu, Daguang Xu, Xiaoping Yang, Simon Chun-Ho Yu, Yading Yuan, Miao Yu, Liping Zhang, Jorge Cardoso, Spyridon Bakas, Rickmer Braren, Volker Heinemann, Christopher Pal, An Tang, Samuel Kadoury, Luc Soler, Bram van Ginneken, Hayit Greenspan, Leo Joskowicz, Bjoern Menze

In this work, we report the set-up and results of the Liver Tumor Segmentation Benchmark (LiTS), which was organized in conjunction with the IEEE International Symposium on Biomedical Imaging (ISBI) 2017 and the International Conferences on Medical Image Computing and Computer-Assisted Intervention (MICCAI) 2017 and 2018.

Benchmarking Computed Tomography (CT) +2

Cannot find the paper you are looking for? You can Submit a new open access paper.