User profiles for Christian Wülker
Christian WülkerResearch Scientist, Philips Research Hamburg Verified email at philips.com Cited by 47 |
Time-of-flight PET image reconstruction using origin ensembles
The origin ensemble (OE) algorithm is a novel statistical method for minimum-mean-square-error
(MMSE) reconstruction of emission tomography data. This method allows one to …
(MMSE) reconstruction of emission tomography data. This method allows one to …
[HTML][HTML] Quantizing Euclidean motions via double-coset decomposition
Abstract Concepts from mathematical crystallography and group theory are used here to
quantize the group of rigid-body motions, resulting in a “motion alphabet” with which robot …
quantize the group of rigid-body motions, resulting in a “motion alphabet” with which robot …
Digital reference objects for evaluating algorithm performance in MR image formation
Purpose Digital Reference Objects (DROs) are mathematical phantoms that can serve as a
basis for evaluating MR image quality (IQ) in an objective way. Their main purpose is to …
basis for evaluating MR image quality (IQ) in an objective way. Their main purpose is to …
Fast Fourier transforms for spherical Gauss-Laguerre basis functions
Spherical Gauss-Laguerre (SGL) basis functions, ie, normalized functions of the type L n−l−1
(l+1∕2) (r 2 )r l Y lm (ϑ, φ), | m | ≤ l < n ∈ ℕ $$\vert m\vert \leq l < n \in \mathbb{N}$$ , L n…
(l+1∕2) (r 2 )r l Y lm (ϑ, φ), | m | ≤ l < n ∈ ℕ $$\vert m\vert \leq l < n \in \mathbb{N}$$ , L n…
Estimation of incomplete organ-coverage using 3D fully convolutional networks
Deviations from the MR acquisition guidelines could lead to images with serious quality
concerns such as incompletely imaged anatomies, which might require re-examinations and …
concerns such as incompletely imaged anatomies, which might require re-examinations and …
Estimation of the ankle-joint space visibility in x-ray images using convolutional neural networks
For the X-ray image acquisition one of the most important factors for diagnostic quality is the
patient position with respect to the X-ray tube and the detector. In case of orthopedic lateral …
patient position with respect to the X-ray tube and the detector. In case of orthopedic lateral …
Quotienting impertinent camera kinematics for 3D video stabilization
With the recent advent of methods that allow for real-time computation, dense 3D flows have
become a viable basis for fast camera motion estimation. Most importantly, dense flows are …
become a viable basis for fast camera motion estimation. Most importantly, dense flows are …
Improved coronary artery calcium (CAC) detection in conventional CT with deep-learning image de-blurring
C Wülker, NR van der Werf… - … 2024: Physics of …, 2024 - spiedigitallibrary.org
We investigated the impact of a CNN-based deep-learning (DL) image de-blurring algorithm
on coronary artery calcium (CAC) detection performance in conventional CT imaging. Our …
on coronary artery calcium (CAC) detection performance in conventional CT imaging. Our …
Fast Fourier Transforms for Spherical Gauss-Laguerre Basis Functions
Spherical Gauss-Laguerre (SGL) basis functions, ie, normalized functions of the type $L_{nl-1}^{(l
+ 1/2)} (r^2) r^{l} Y_{lm}(\vartheta,\varphi)$, $|m| \leq l < n \in \mathbb{N}$, $L_{nl-1}^{(l …
+ 1/2)} (r^2) r^{l} Y_{lm}(\vartheta,\varphi)$, $|m| \leq l < n \in \mathbb{N}$, $L_{nl-1}^{(l …
Fat-constrained 18F-FDG PET reconstruction in hybrid PET/MR imaging
S Prevrhal, S Heinzer, C Wülker… - Journal of Nuclear …, 2014 - Soc Nuclear Med
Fusion of information from PET and MR imaging can increase the diagnostic value of both
modalities. This work sought to improve 18 F FDG PET image quality by using MR Dixon fat-…
modalities. This work sought to improve 18 F FDG PET image quality by using MR Dixon fat-…