Search Results for author: Christopher Syben

Found 25 papers, 2 papers with code

Optimizing CT Scan Geometries With and Without Gradients

no code implementations13 Feb 2023 Mareike Thies, Fabian Wagner, Noah Maul, Laura Pfaff, Linda-Sophie Schneider, Christopher Syben, Andreas Maier

In computed tomography (CT), the projection geometry used for data acquisition needs to be known precisely to obtain a clear reconstructed image.

Computed Tomography (CT) Motion Compensation

Geometric Constraints Enable Self-Supervised Sinogram Inpainting in Sparse-View Tomography

no code implementations13 Feb 2023 Fabian Wagner, Mareike Thies, Noah Maul, Laura Pfaff, Oliver Aust, Sabrina Pechmann, Christopher Syben, Andreas Maier

By reconstructing independent stacks of projection data, a self-supervised loss is calculated in the CT image domain and used to directly optimize projection image intensities to match the missing tomographic views constrained by the projection geometry.

Computed Tomography (CT) SSIM

Deep Learning-based Patient Re-identification Is able to Exploit the Biometric Nature of Medical Chest X-ray Data

1 code implementation15 Mar 2021 Kai Packhäuser, Sebastian Gündel, Nicolas Münster, Christopher Syben, Vincent Christlein, Andreas Maier

Our verification system is able to identify whether two frontal chest X-ray images are from the same person with an AUC of 0. 9940 and a classification accuracy of 95. 55%.

Retrieval

X-ray Scatter Estimation Using Deep Splines

no code implementations22 Jan 2021 Philipp Roser, Annette Birkhold, Alexander Preuhs, Christopher Syben, Lina Felsner, Elisabeth Hoppe, Norbert Strobel, Markus Korwarschik, Rebecca Fahrig, Andreas Maier

Algorithmic X-ray scatter compensation is a desirable technique in flat-panel X-ray imaging and cone-beam computed tomography.

Medical Physics Image and Video Processing

Cephalogram Synthesis and Landmark Detection in Dental Cone-Beam CT Systems

no code implementations9 Sep 2020 Yixing Huang, Fuxin Fan, Christopher Syben, Philipp Roser, Leonid Mill, Andreas Maier

The method trained on conventional cephalograms can be directly applied to landmark detection in the synthetic cephalograms, achieving 93. 0% and 80. 7% successful detection rate in 4 mm precision range for synthetic cephalograms from 3D volumes and 2D projections respectively.

3D Reconstruction Generative Adversarial Network +1

Simultaneous Estimation of X-ray Back-Scatter and Forward-Scatter using Multi-Task Learning

no code implementations8 Jul 2020 Philipp Roser, Xia Zhong, Annette Birkhold, Alexander Preuhs, Christopher Syben, Elisabeth Hoppe, Norbert Strobel, Markus Kowarschik, Rebecca Fahrig, Andreas Maier

Here, we propose a novel approach combining conventional techniques with learning-based methods to simultaneously estimate the forward-scatter reaching the detector as well as the back-scatter affecting the patient skin dose.

Blocking Multi-Task Learning

Projection-to-Projection Translation for Hybrid X-ray and Magnetic Resonance Imaging

no code implementations19 Nov 2019 Bernhard Stimpel, Christopher Syben, Tobias Würfl, Katharina Breininger, Philipp Hoelter, Arnd Dörfler, Andreas Maier

Additionally, a weighting scheme in the loss computation that favors high-frequency structures is proposed to focus on the important details and contours in projection imaging.

Image Enhancement Translation

RinQ Fingerprinting: Recurrence-informed Quantile Networks for Magnetic Resonance Fingerprinting

no code implementations9 Jul 2019 Elisabeth Hoppe, Florian Thamm, Gregor Körzdörfer, Christopher Syben, Franziska Schirrmacher, Mathias Nittka, Josef Pfeuffer, Heiko Meyer, Andreas Maier

Although the acquisition is highly accelerated, the state-of-the-art reconstruction suffers from long computation times: Template matching methods are used to find the most similar signal to the measured one by comparing it to pre-simulated signals of possible parameter combinations in a discretized dictionary.

Magnetic Resonance Fingerprinting Template Matching

Learning with Known Operators reduces Maximum Training Error Bounds

no code implementations3 Jul 2019 Andreas K. Maier, Christopher Syben, Bernhard Stimpel, Tobias Würfl, Mathis Hoffmann, Frank Schebesch, Weilin Fu, Leonid Mill, Lasse Kling, Silke Christiansen

We assume that our analysis will support further investigation of known operators in other fields of physics, imaging, and signal processing.

Image Reconstruction

A Gentle Introduction to Deep Learning in Medical Image Processing

no code implementations12 Oct 2018 Andreas Maier, Christopher Syben, Tobias Lasser, Christian Riess

This paper tries to give a gentle introduction to deep learning in medical image processing, proceeding from theoretical foundations to applications.

Image Registration Image Segmentation +1

User Loss -- A Forced-Choice-Inspired Approach to Train Neural Networks directly by User Interaction

no code implementations24 Jul 2018 Shahab Zarei, Bernhard Stimpel, Christopher Syben, Andreas Maier

This approach opens the way towards implementation of direct user feedback in deep learning and is applicable for a wide range of application.

Image Denoising Medical Image Denoising

Deriving Neural Network Architectures using Precision Learning: Parallel-to-fan beam Conversion

no code implementations9 Jul 2018 Christopher Syben, Bernhard Stimpel, Jonathan Lommen, Tobias Würfl, Arnd Dörfler, Andreas Maier

The results demonstrate that the proposed method is superior to ray-by-ray interpolation and is able to deliver sharper images using the same amount of parallel-beam input projections which is crucial for interventional applications.

MR to X-Ray Projection Image Synthesis

no code implementations20 Oct 2017 Bernhard Stimpel, Christopher Syben, Tobias Würfl, Katrin Mentl, Arnd Dörfler, Andreas Maier

The perceptual-loss showed to be able to preserve most of the high-frequency details in the projection images and, thus, is recommended for the underlying task and similar problems.

Image-to-Image Translation Translation

Precision Learning: Reconstruction Filter Kernel Discretization

no code implementations17 Oct 2017 Christopher Syben, Bernhard Stimpel, Katharina Breininger, Tobias Würfl, Rebecca Fahrig, Arnd Dörfler, Andreas Maier

In this paper, we present substantial evidence that a deep neural network will intrinsically learn the appropriate way to discretize the ideal continuous reconstruction filter.

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