Search Results for author: Guilherme Pombo

Found 7 papers, 3 papers with code

Computational limits to the legibility of the imaged human brain

1 code implementation23 Aug 2023 James K Ruffle, Robert J Gray, Samia Mohinta, Guilherme Pombo, Chaitanya Kaul, Harpreet Hyare, Geraint Rees, Parashkev Nachev

It remains unknown whether the difficulty arises from the absence of individuating biological patterns within the brain, or from limited power to access them with the models and compute at our disposal.

Deep Variational Lesion-Deficit Mapping

1 code implementation27 May 2023 Guilherme Pombo, Robert Gray, Amy P. K. Nelson, Chris Foulon, John Ashburner, Parashkev Nachev

Here we initiate the application of deep generative neural network architectures to the task of lesion-deficit inference, formulating it as the estimation of an expressive hierarchical model of the joint lesion and deficit distributions conditioned on a latent neural substrate.

Brain tumour genetic network signatures of survival

no code implementations15 Jan 2023 James K Ruffle, Samia Mohinta, Guilherme Pombo, Robert Gray, Valeriya Kopanitsa, Faith Lee, Sebastian Brandner, Harpreet Hyare, Parashkev Nachev

Tumour heterogeneity is increasingly recognized as a major obstacle to therapeutic success across neuro-oncology.

Equitable modelling of brain imaging by counterfactual augmentation with morphologically constrained 3D deep generative models

no code implementations29 Nov 2021 Guilherme Pombo, Robert Gray, Jorge Cardoso, Sebastien Ourselin, Geraint Rees, John Ashburner, Parashkev Nachev

The model is intended to synthesise counterfactual training data augmentations for downstream discriminative modelling tasks where fidelity is limited by data imbalance, distributional instability, confounding, or underspecification, and exhibits inequitable performance across distinct subpopulations.

counterfactual

Bayesian Volumetric Autoregressive generative models for better semisupervised learning

1 code implementation26 Jul 2019 Guilherme Pombo, Robert Gray, Tom Varsavsky, John Ashburner, Parashkev Nachev

Second, we show that reformulating this model to approximate a deep Gaussian process yields a measure of uncertainty that improves the performance of semi-supervised learning, in particular classification performance in settings where the proportion of labelled data is low.

General Classification Semantic Segmentation

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