Search Results for author: Bruce Fischl

Found 27 papers, 10 papers with code

Boosting Skull-Stripping Performance for Pediatric Brain Images

no code implementations26 Feb 2024 William Kelley, Nathan Ngo, Adrian V. Dalca, Bruce Fischl, Lilla Zöllei, Malte Hoffmann

With the emergence of multi-institutional pediatric data acquisition efforts to broaden the understanding of perinatal brain development, it is essential to develop robust and well-tested tools ready for the relevant data processing.

Skull Stripping

Fully Convolutional Slice-to-Volume Reconstruction for Single-Stack MRI

no code implementations5 Dec 2023 Sean I. Young, Yaël Balbastre, Bruce Fischl, Polina Golland, Juan Eugenio Iglesias

Here, we propose a SVR method that overcomes the shortcomings of previous work and produces state-of-the-art reconstructions in the presence of extreme inter-slice motion.

3D Reconstruction Depth Estimation +1

JOSA: Joint surface-based registration and atlas construction of brain geometry and function

no code implementations22 Oct 2023 Jian Li, Greta Tuckute, Evelina Fedorenko, Brian L. Edlow, Adrian V. Dalca, Bruce Fischl

By recognizing the mismatch between geometry and function, JOSA provides new insights into the future development of registration methods using joint analysis of the brain structure and function.

Multi-Head Graph Convolutional Network for Structural Connectome Classification

no code implementations2 May 2023 Anees Kazi, Jocelyn Mora, Bruce Fischl, Adrian V. Dalca, Iman Aganj

To test the ability of our model to extract complementary and representative features from brain connectivity data, we chose the task of sex classification.

Classification

Joint cortical registration of geometry and function using semi-supervised learning

no code implementations2 Mar 2023 Jian Li, Greta Tuckute, Evelina Fedorenko, Brian L. Edlow, Bruce Fischl, Adrian V. Dalca

Brain surface-based image registration, an important component of brain image analysis, establishes spatial correspondence between cortical surfaces.

Image Registration

Anatomy-aware and acquisition-agnostic joint registration with SynthMorph

no code implementations26 Jan 2023 Malte Hoffmann, Andrew Hoopes, Douglas N. Greve, Bruce Fischl, Adrian V. Dalca

Most affine methods are agnostic to anatomy, meaning the registration will be inaccurate if algorithms consider all structures in the image.

Affine Image Registration Anatomy +1

Data Consistent Deep Rigid MRI Motion Correction

1 code implementation25 Jan 2023 Nalini M. Singh, Neel Dey, Malte Hoffmann, Bruce Fischl, Elfar Adalsteinsson, Robert Frost, Adrian V. Dalca, Polina Golland

Motion artifacts are a pervasive problem in MRI, leading to misdiagnosis or mischaracterization in population-level imaging studies.

Image Reconstruction

SuperWarp: Supervised Learning and Warping on U-Net for Invariant Subvoxel-Precise Registration

no code implementations15 May 2022 Sean I. Young, Yaël Balbastre, Adrian V. Dalca, William M. Wells, Juan Eugenio Iglesias, Bruce Fischl

In recent years, learning-based image registration methods have gradually moved away from direct supervision with target warps to instead use self-supervision, with excellent results in several registration benchmarks.

Image Registration

Learning the Effect of Registration Hyperparameters with HyperMorph

no code implementations30 Mar 2022 Andrew Hoopes, Malte Hoffmann, Douglas N. Greve, Bruce Fischl, John Guttag, Adrian V. Dalca

We design a meta network, or hypernetwork, that predicts the parameters of a registration network for input hyperparameters, thereby comprising a single model that generates the optimal deformation field corresponding to given hyperparameter values.

Image Registration

SynthStrip: Skull-Stripping for Any Brain Image

no code implementations18 Mar 2022 Andrew Hoopes, Jocelyn S. Mora, Adrian V. Dalca, Bruce Fischl, Malte Hoffmann

The removal of non-brain signal from magnetic resonance imaging (MRI) data, known as skull-stripping, is an integral component of many neuroimage analysis streams.

Skull Stripping

Supervision by Denoising for Medical Image Segmentation

no code implementations7 Feb 2022 Sean I. Young, Adrian V. Dalca, Enzo Ferrante, Polina Golland, Christopher A. Metzler, Bruce Fischl, Juan Eugenio Iglesias

SUD unifies stochastic averaging and spatial denoising techniques under a spatio-temporal denoising framework and alternates denoising and model weight update steps in an optimization framework for semi-supervision.

Denoising Image Reconstruction +3

Unsupervised learning of MRI tissue properties using MRI physics models

no code implementations6 Jul 2021 Divya Varadarajan, Katherine L. Bouman, Andre van der Kouwe, Bruce Fischl, Adrian V. Dalca

In this work we propose an unsupervised deep-learning strategy that employs MRI physics to estimate all three tissue properties from a single multiecho MRI scan session, and generalizes across varying acquisition parameters.

Robust joint registration of multiple stains and MRI for multimodal 3D histology reconstruction: Application to the Allen human brain atlas

1 code implementation30 Apr 2021 Adrià Casamitjana, Marco Lorenzi, Sebastiano Ferraris, Loc Peter, Marc Modat, Allison Stevens, Bruce Fischl, Tom Vercauteren, Juan Eugenio Iglesias

The model relies on a spanning tree of latent transforms connecting all the sections and slices of the reference volume, and assumes that the registration between any pair of images can be see as a noisy version of the composition of (possibly inverted) latent transforms connecting the two images.

3D Reconstruction Bayesian Inference

HyperMorph: Amortized Hyperparameter Learning for Image Registration

1 code implementation4 Jan 2021 Andrew Hoopes, Malte Hoffmann, Bruce Fischl, John Guttag, Adrian V. Dalca

We present HyperMorph, a learning-based strategy for deformable image registration that removes the need to tune important registration hyperparameters during training.

Image Registration

Joint super-resolution and synthesis of 1 mm isotropic MP-RAGE volumes from clinical MRI exams with scans of different orientation, resolution and contrast

1 code implementation24 Dec 2020 Juan Eugenio Iglesias, Benjamin Billot, Yael Balbastre, Azadeh Tabari, John Conklin, Daniel C. Alexander, Polina Golland, Brian L. Edlow, Bruce Fischl

Most existing algorithms for automatic 3D morphometry of human brain MRI scans are designed for data with near-isotropic voxels at approximately 1 mm resolution, and frequently have contrast constraints as well - typically requiring T1 scans (e. g., MP-RAGE).

Image Registration Skull Stripping +1

Cortical surface registration using unsupervised learning

1 code implementation9 Apr 2020 Jieyu Cheng, Adrian V. Dalca, Bruce Fischl, Lilla Zollei

The experiments show that the proposed SphereMorph is capable of modeling the geometric registration problem in a CNN framework and demonstrate superior registration accuracy and computational efficiency.

Computational Efficiency

A Learning Strategy for Contrast-agnostic MRI Segmentation

3 code implementations MIDL 2019 Benjamin Billot, Douglas Greve, Koen van Leemput, Bruce Fischl, Juan Eugenio Iglesias, Adrian V. Dalca

These samples are produced using the generative model of the classical Bayesian segmentation framework, with randomly sampled parameters for appearance, deformation, noise, and bias field.

Brain Segmentation MRI segmentation +2

FastSurfer -- A fast and accurate deep learning based neuroimaging pipeline

1 code implementation9 Oct 2019 Leonie Henschel, Sailesh Conjeti, Santiago Estrada, Kersten Diers, Bruce Fischl, Martin Reuter

In this work we propose a fast and accurate deep learning based neuroimaging pipeline for the automated processing of structural human brain MRI scans, replicating FreeSurfer's anatomical segmentation including surface reconstruction and cortical parcellation.

Brain Segmentation Segmentation +1

Unsupervised Deep Learning for Bayesian Brain MRI Segmentation

1 code implementation25 Apr 2019 Adrian V. Dalca, Evan Yu, Polina Golland, Bruce Fischl, Mert R. Sabuncu, Juan Eugenio Iglesias

To develop a deep learning-based segmentation model for a new image dataset (e. g., of different contrast), one usually needs to create a new labeled training dataset, which can be prohibitively expensive, or rely on suboptimal ad hoc adaptation or augmentation approaches.

Brain Image Segmentation Brain Segmentation +5

PSACNN: Pulse Sequence Adaptive Fast Whole Brain Segmentation

no code implementations17 Jan 2019 Amod Jog, Andrew Hoopes, Douglas N. Greve, Koen van Leemput, Bruce Fischl

In this paper we propose a CNN-based segmentation algorithm that, in addition to being highly accurate and fast, is also resilient to variation in the input acquisition.

Brain Segmentation

Pulse Sequence Resilient Fast Brain Segmentation

no code implementations30 Jul 2018 Amod Jog, Bruce Fischl

We use the forward models to augment the training data with test data specific training examples.

Anatomy Brain Segmentation +1

A probabilistic atlas of the human thalamic nuclei combining ex vivo MRI and histology

no code implementations22 Jun 2018 Juan Eugenio Iglesias, Ricardo Insausti, Garikoitz Lerma-Usabiaga, Martina Bocchetta, Koen van Leemput, Douglas N. Greve, Andre van der Kouwe, Bruce Fischl, Cesar Caballero-Gaudes, Pedro M Paz-Alonso

In this study, we present a probabilistic atlas of the thalamic nuclei built using ex vivo brain MRI scans and histological data, as well as the application of the atlas to in vivo MRI segmentation.

Bayesian Inference Hippocampus +2

Joint registration and synthesis using a probabilistic model for alignment of MRI and histological sections

no code implementations16 Jan 2018 Juan Eugenio Iglesias, Marc Modat, Loic Peter, Allison Stevens, Roberto Annunziata, Tom Vercauteren, Ed Lein, Bruce Fischl, Sebastien Ourselin

Here, we overcome this limitation with a probabilistic method that simultaneously solves for registration and synthesis directly on the target images, without any training data.

Bayesian Inference

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