Search Results for author: Nicholas Ayache

Found 21 papers, 2 papers with code

Morphologically-Aware Consensus Computation via Heuristics-based IterATive Optimization (MACCHIatO)

no code implementations14 Sep 2023 Dimitri Hamzaoui, Sarah Montagne, Raphaële Renard-Penna, Nicholas Ayache, Hervé Delingette

We compared extensively our method on several datasets with the STAPLE method and the naive segmentation averaging method, showing that it leads to binary consensus masks of intermediate size between Majority Voting and STAPLE and to different posterior probabilities than Mask Averaging and STAPLE methods.

Segmentation

Real-Time Dynamic Data Driven Deformable Registration for Image-Guided Neurosurgery: Computational Aspects

no code implementations6 Sep 2023 Nikos Chrisochoides, Andrey Fedorov, Yixun Liu, Andriy Kot, Panos Foteinos, Fotis Drakopoulos, Christos Tsolakis, Emmanuel Billias, Olivier Clatz, Nicholas Ayache, Alex Golby, Peter Black, Ron Kikinis

Current neurosurgical procedures utilize medical images of various modalities to enable the precise location of tumors and critical brain structures to plan accurate brain tumor resection.

Data Stealing Attack on Medical Images: Is it Safe to Export Networks from Data Lakes?

no code implementations7 Jun 2022 Huiyu Li, Nicholas Ayache, Hervé Delingette

Instead, only a secured remote access to a data lake is granted to the model owner without any ability to retrieve data from the data lake.

Image Compression Image Reconstruction +3

Deep reinforcement learning in medical imaging: A literature review

no code implementations5 Mar 2021 S. Kevin Zhou, Hoang Ngan Le, Khoa Luu, Hien V. Nguyen, Nicholas Ayache

Deep reinforcement learning (DRL) augments the reinforcement learning framework, which learns a sequence of actions that maximizes the expected reward, with the representative power of deep neural networks.

Lesion Detection Miscellaneous +3

Anatomically Consistent Segmentation of Organs at Risk in MRI with Convolutional Neural Networks

no code implementations3 Jul 2019 Pawel Mlynarski, Hervé Delingette, Hamza Alghamdi, Pierre-Yves Bondiau, Nicholas Ayache

We report cross-validated quantitative results on a database of 44 contrast-enhanced T1-weighted MRIs with provided segmentations of the considered organs at risk, which were originally used for radiotherapy planning.

Hippocampus Segmentation

A model of brain morphological changes related to aging and Alzheimer's disease from cross-sectional assessments

no code implementations23 May 2019 Raphaël Sivera, Hervé Delingette, Marco Lorenzi, Xavier Pennec, Nicholas Ayache

In this study we propose a deformation-based framework to jointly model the influence of aging and Alzheimer's disease (AD) on the brain morphological evolution.

Monotonic Gaussian Process for Spatio-Temporal Disease Progression Modeling in Brain Imaging Data

no code implementations28 Feb 2019 Clement Abi Nader, Nicholas Ayache, Philippe Robert, Marco Lorenzi

We introduce a probabilistic generative model for disentangling spatio-temporal disease trajectories from series of high-dimensional brain images.

blind source separation Gaussian Processes

Unsupervised shape and motion analysis of 3822 cardiac 4D MRIs of UK Biobank

no code implementations15 Feb 2019 Qiao Zheng, Hervé Delingette, Kenneth Fung, Steffen E. Petersen, Nicholas Ayache

First, with a feature extraction method previously published based on deep learning models, we extract from each case 9 feature values characterizing both the cardiac shape and motion.

Clustering Dimensionality Reduction +2

Learning a Probabilistic Model for Diffeomorphic Registration

no code implementations18 Dec 2018 Julian Krebs, Hervé Delingette, Boris Mailhé, Nicholas Ayache, Tommaso Mansi

Besides, we visualized the learned latent space and show that the encoded deformations can be used to transport deformations and to cluster diseases with a classification accuracy of 83% after applying a linear projection.

Deformable Medical Image Registration Diffeomorphic Medical Image Registration +1

Deep Learning with Mixed Supervision for Brain Tumor Segmentation

no code implementations10 Dec 2018 Pawel Mlynarski, Hervé Delingette, Antonio Criminisi, Nicholas Ayache

In this paper, we propose to use both types of training data (fully-annotated and weakly-annotated) to train a deep learning model for segmentation.

Brain Tumor Segmentation General Classification +2

Explainable cardiac pathology classification on cine MRI with motion characterization by semi-supervised learning of apparent flow

1 code implementation8 Nov 2018 Qiao Zheng, Hervé Delingette, Nicholas Ayache

We propose a method to classify cardiac pathology based on a novel approach to extract image derived features to characterize the shape and motion of the heart.

Cardiac Segmentation General Classification +2

3D Convolutional Neural Networks for Tumor Segmentation using Long-range 2D Context

no code implementations23 Jul 2018 Pawel Mlynarski, Hervé Delingette, Antonio Criminisi, Nicholas Ayache

Furthermore, we propose a network architecture in which the different MR sequences are processed by separate subnetworks in order to be more robust to the problem of missing MR sequences.

Segmentation Tumor Segmentation

3D Consistent & Robust Segmentation of Cardiac Images by Deep Learning with Spatial Propagation

1 code implementation25 Apr 2018 Qiao Zheng, Hervé Delingette, Nicolas Duchateau, Nicholas Ayache

We propose a method based on deep learning to perform cardiac segmentation on short axis MRI image stacks iteratively from the top slice (around the base) to the bottom slice (around the apex).

Cardiac Segmentation Segmentation

Unsupervised Probabilistic Deformation Modeling for Robust Diffeomorphic Registration

no code implementations19 Apr 2018 Julian Krebs, Tommaso Mansi, Boris Mailhé, Nicholas Ayache, Hervé Delingette

This model enables to also generate normal or pathological deformations of any new image based on the probabilistic latent space.

3D Consistent Biventricular Myocardial Segmentation Using Deep Learning for Mesh Generation

no code implementations29 Mar 2018 Qiao Zheng, Hervé Delingette, Nicolas Duchateau, Nicholas Ayache

We present a novel automated method to segment the myocardium of both left and right ventricles in MRI volumes.

Image Generation

Automatic View-Point Selection for Inter-Operative Endoscopic Surveillance

no code implementations13 Oct 2016 Anant S. Vemuri, Stephane A. Nicolau, Jacques Marescaux, Luc Soler, Nicholas Ayache

Esophageal adenocarcinoma arises from Barrett's esophagus, which is the most serious complication of gastroesophageal reflux disease.

Retrieval

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