Search Results for author: Katrin Amunts

Found 14 papers, 4 papers with code

Self-Supervised Representation Learning for Nerve Fiber Distribution Patterns in 3D-PLI

no code implementations30 Jan 2024 Alexander Oberstrass, Sascha E. A. Muenzing, Meiqi Niu, Nicola Palomero-Gallagher, Christian Schiffer, Markus Axer, Katrin Amunts, Timo Dickscheid

To this end, we propose the application of a fully data-driven approach to characterize nerve fiber architecture in 3D-PLI images using self-supervised representation learning.

Contrastive Learning Representation Learning

Denoising Diffusion Probabilistic Models for Image Inpainting of Cell Distributions in the Human Brain

no code implementations28 Nov 2023 Jan-Oliver Kropp, Christian Schiffer, Katrin Amunts, Timo Dickscheid

This is the basis to study the multi-scale architecture of the brain regarding its subdivision into brain areas and nuclei, cortical layers, columns, and cell clusters down to single cell morphology Methods for brain mapping and cell segmentation exploit such images to enable rapid and automated analysis of cytoarchitecture and cell distribution in complete series of histological sections.

Cell Segmentation Denoising +1

Uncertainty-Aware Contour Proposal Networks for Cell Segmentation in Multi-Modality High-Resolution Microscopy Images

1 code implementation NeurIPS CellSeg 2022 2022 Eric Upschulte, Stefan Harmeling, Katrin Amunts, Timo Dickscheid

In the context of the NeurIPS 22 Cell Segmentation Challenge, the proposed solution is shown to generalize well in a multi-modality setting, while respecting domain-specific requirements such as focusing on specific cell types.

Cell Segmentation Instance Segmentation +2

GORDA: Graph-based ORientation Distribution Analysis of SLI scatterometry Patterns of Nerve Fibres

no code implementations12 Apr 2022 Esteban Vaca, Miriam Menzel, Katrin Amunts, Markus Axer, Timo Dickscheid

Scattered Light Imaging (SLI) is a novel approach for microscopically revealing the fibre architecture of unstained brain sections.

Contour Proposal Networks for Biomedical Instance Segmentation

2 code implementations7 Apr 2021 Eric Upschulte, Stefan Harmeling, Katrin Amunts, Timo Dickscheid

We construct CPN models with different backbone networks, and apply them to instance segmentation of cells in datasets from different modalities.

Blood Cell Detection Cell Detection +7

2D histology meets 3D topology: Cytoarchitectonic brain mapping with Graph Neural Networks

no code implementations9 Mar 2021 Christian Schiffer, Stefan Harmeling, Katrin Amunts, Timo Dickscheid

By solving the brain mapping problem on this graph using graph neural networks, we obtain significantly improved classification results.

Descriptive General Classification +1

Contrastive Representation Learning for Whole Brain Cytoarchitectonic Mapping in Histological Human Brain Sections

no code implementations25 Nov 2020 Christian Schiffer, Katrin Amunts, Stefan Harmeling, Timo Dickscheid

Cytoarchitectonic maps provide microstructural reference parcellations of the brain, describing its organization in terms of the spatial arrangement of neuronal cell bodies as measured from histological tissue sections.

Contrastive Learning General Classification +2

Convolutional Neural Networks for cytoarchitectonic brain mapping at large scale

no code implementations25 Nov 2020 Christian Schiffer, Hannah Spitzer, Kai Kiwitz, Nina Unger, Konrad Wagstyl, Alan C. Evans, Stefan Harmeling, Katrin Amunts, Timo Dickscheid

Here we present a new workflow for mapping cytoarchitectonic areas in large series of cell-body stained histological sections of human postmortem brains.

3D Reconstruction

Scattered Light Imaging: Resolving the substructure of nerve fiber crossings in whole brain sections with micrometer resolution

1 code implementation3 Aug 2020 Miriam Menzel, Jan André Reuter, David Gräßel, Mike Huwer, Philipp Schlömer, Katrin Amunts, Markus Axer

We demonstrate in different brain samples (human optic tracts, vervet monkey brain, rat brain) that the 2D fiber directions can be reliably reconstructed for up to three crossing nerve fiber bundles in each image pixel with an in-plane resolution of up to 6. 5 $\mu$m.

Medical Physics Biological Physics Optics

Towards ultra-high resolution 3D reconstruction of a whole rat brain from 3D-PLI data

no code implementations29 Jul 2018 Sharib Ali, Martin Schober, Philipp Schlöme, Katrin Amunts, Markus Axer, Karl Rohr

We introduce a new method for registration and 3D reconstruction of high- and ultra-high resolution (64 $\mu$m and 1. 3 $\mu$m pixel size) histological images of a Wistar rat brain acquired by 3D polarized light imaging (3D-PLI).

3D Reconstruction

Improving Cytoarchitectonic Segmentation of Human Brain Areas with Self-supervised Siamese Networks

no code implementations13 Jun 2018 Hannah Spitzer, Kai Kiwitz, Katrin Amunts, Stefan Harmeling, Timo Dickscheid

We show that the self-supervised model has implicitly learned to distinguish several cortical brain areas -- a strong indicator that the proposed auxiliary task is appropriate for cytoarchitectonic mapping.

Parcellation of Visual Cortex on high-resolution histological Brain Sections using Convolutional Neural Networks

no code implementations30 May 2017 Hannah Spitzer, Katrin Amunts, Stefan Harmeling, Timo Dickscheid

Its high resolution allows the study of laminar and columnar patterns of cell distributions, which build an important basis for the simulation of cortical areas and networks.

Cannot find the paper you are looking for? You can Submit a new open access paper.