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Paper · 2007.04780 · 2020

Modelling the Distribution of 3D Brain MRI using a 2D Slice VAE

arXiv · PDF · Open in the Atlas

Code that ran

We lifted 6 functions out of this paper's own repositories and ran 4 of them in a sandbox. "Ran" means the function executed on a synthesized input and returned a value. It is not a reproduction of the paper's results.

RepositoryRoleRan
voanna/slices-to-3d-brain-vae canonical 4 of 6
FunctionStatusWhere it lives
KLLoss Ran voanna/slices-to-3d-brain-vae/experiments/MICCAI-release-version/main_experiment_128.py
code served (permissive licence) · get_code("06d3ab1b69cbdae4")
get_image_and_label_paths Ran voanna/slices-to-3d-brain-vae/preproc_hcp/data_hcp.py
code served (permissive licence) · get_code("1c82c7db59479438")
makefolder Ran voanna/slices-to-3d-brain-vae/preproc_hcp/utils.py
code served (permissive licence) · get_code("e54a3bb7162beb68")
normalise_image Ran voanna/slices-to-3d-brain-vae/preproc_hcp/utils.py
code served (permissive licence) · get_code("a3d0a83a66c2b241")
test Not yet run voanna/slices-to-3d-brain-vae/experiments/MICCAI-release-version/main_experiment_128.py
code served (permissive licence) · get_code("9f9c9d609f6d18ce")
train Not yet run voanna/slices-to-3d-brain-vae/experiments/MICCAI-release-version/main_experiment_128.py
code served (permissive licence) · get_code("645a059ea71dbdad")

Repositories linked to this paper

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Abstract

Probabilistic modelling has been an essential tool in medical image analysis, especially for analyzing brain Magnetic Resonance Images (MRI). Recent deep learning techniques for estimating high-dimensional distributions, in particular Variational Autoencoders (VAEs), opened up new avenues for probabilistic modeling. Modelling of volumetric data has remained a challenge, however, because constraints on available computation and training data make it difficult effectively leverage VAEs, which are well-developed for 2D images. We propose a method to model 3D MR brain volumes distribution by combining a 2D slice VAE with a Gaussian model that captures the relationships between slices. We do so by estimating the sample mean and covariance in the latent space of the 2D model over the slice direction. This combined model lets us sample new coherent stacks of latent variables to decode into slices of a volume. We also introduce a novel evaluation method for generated volumes that quantifies how well their segmentations match those of true brain anatomy. We demonstrate that our proposed model is competitive in generating high quality volumes at high resolutions according to both traditional metrics and our proposed evaluation.

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