Search Results for author: Giorgos Papanastasiou

Found 13 papers, 5 papers with code

Factorised spatial representation learning: application in semi-supervised myocardial segmentation

1 code implementation19 Mar 2018 Agisilaos Chartsias, Thomas Joyce, Giorgos Papanastasiou, Scott Semple, Michelle Williams, David Newby, Rohan Dharmakumar, Sotirios A. Tsaftaris

Specifically, we achieve comparable performance to fully supervised networks using a fraction of labelled images in experiments on ACDC and a dataset from Edinburgh Imaging Facility QMRI.

Medical Image Segmentation Myocardium Segmentation +1

Unsupervised learning for cross-domain medical image synthesis using deformation invariant cycle consistency networks

no code implementations12 Aug 2018 Chengjia Wang, Gillian Macnaught, Giorgos Papanastasiou, Tom MacGillivray, David Newby

Recently, the cycle-consistent generative adversarial networks (CycleGAN) has been widely used for synthesis of multi-domain medical images.

Image Generation

Disentangled Representation Learning in Cardiac Image Analysis

4 code implementations22 Mar 2019 Agisilaos Chartsias, Thomas Joyce, Giorgos Papanastasiou, Michelle Williams, David Newby, Rohan Dharmakumar, Sotirios A. Tsaftaris

We can venture further and consider that a medical image naturally factors into some spatial factors depicting anatomy and factors that denote the imaging characteristics.

Anatomy Computed Tomography (CT) +3

Semi-supervised Pathology Segmentation with Disentangled Representations

1 code implementation5 Sep 2020 Haochuan Jiang, Agisilaos Chartsias, Xinheng Zhang, Giorgos Papanastasiou, Scott Semple, Mark Dweck, David Semple, Rohan Dharmakumar, Sotirios A. Tsaftaris

The model is trained in a semi-supervised fashion with new reconstruction losses directly aiming to improve pathology segmentation with limited annotations.

Anatomy Disentanglement +1

Unsupervised Image Registration Towards Enhancing Performance and Explainability in Cardiac And Brain Image Analysis

no code implementations7 Mar 2022 Chengjia Wang, Guang Yang, Giorgos Papanastasiou

Moreover, inverse-consistency is a fundamental inter-modality registration property that is not considered in deep learning registration algorithms.

Image Generation Unsupervised Image Registration

Less is More: Unsupervised Mask-guided Annotated CT Image Synthesis with Minimum Manual Segmentations

no code implementations19 Mar 2023 Xiaodan Xing, Giorgos Papanastasiou, Simon Walsh, Guang Yang

To address these issues, in this work, we propose a novel strategy for medical image synthesis, namely Unsupervised Mask (UM)-guided synthesis, to obtain both synthetic images and segmentations using limited manual segmentation labels.

Data Augmentation Image Generation +1

You Don't Have to Be Perfect to Be Amazing: Unveil the Utility of Synthetic Images

no code implementations25 May 2023 Xiaodan Xing, Federico Felder, Yang Nan, Giorgos Papanastasiou, Walsh Simon, Guang Yang

In addition, we have empirically demonstrated that the utility score does not require images with both high fidelity and high variety.

Data Augmentation Image Generation +1

Is attention all you need in medical image analysis? A review

no code implementations24 Jul 2023 Giorgos Papanastasiou, Nikolaos Dikaios, Jiahao Huang, Chengjia Wang, Guang Yang

Attention and Transformer compartments (Transf/Attention) which can well maintain properties for modelling global relationships, have been proposed as lighter alternatives of full Transformers.

Explainable unsupervised multi-modal image registration using deep networks

no code implementations3 Aug 2023 Chengjia Wang, Giorgos Papanastasiou

Clinical decision making from magnetic resonance imaging (MRI) combines complementary information from multiple MRI sequences (defined as 'modalities').

Decision Making Image Classification +1

Benchmarking Counterfactual Image Generation

1 code implementation29 Mar 2024 Thomas Melistas, Nikos Spyrou, Nefeli Gkouti, Pedro Sanchez, Athanasios Vlontzos, Giorgos Papanastasiou, Sotirios A. Tsaftaris

Counterfactual image generation is pivotal for understanding the causal relations of variables, with applications in interpretability and generation of unbiased synthetic data.

Benchmarking Conditional Image Generation +1

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