Peter Modregger
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View article: Multi-modal strain mapping of steel crack tips with micrometre spatial resolution
Multi-modal strain mapping of steel crack tips with micrometre spatial resolution Open
Due to their superior fatigue strength, martensitic steels are the material of choice for high cyclic loading applications such as coil springs. However, crack propagation is influenced by residual stresses and their interaction is poorly …
View article: Ultimate sensitivity in X-ray diffraction: angular moments versus shot noise
Ultimate sensitivity in X-ray diffraction: angular moments versus shot noise Open
The sensitivity towards Bragg peak parameters constitutes a crucial performance attribute of X-ray diffraction experiments. Diffraction peaks are frequently characterized by model-free angular moment analysis, which offers greater versatil…
View article: Analytical single-shot phase-contrast computed tomography for multi-material samples
Analytical single-shot phase-contrast computed tomography for multi-material samples Open
We present a novel single-shot technique for quantitative X-ray phase contrast imaging (XPCI) with the edge illumination (EI) method based on the linear joint reconstruction (LJR) approach. Unlike conventional two-step EI approaches that r…
View article: Analytical single-shot phase-contrast computed tomography for multi-material samples
Analytical single-shot phase-contrast computed tomography for multi-material samples Open
We present a novel single-shot technique for quantitative X-ray phase contrast imaging (XPCI) with the edge illumination (EI) method based on the linear joint reconstruction (LJR) approach. Unlike conventional two-step EI approaches that r…
View article: Parallax in angular sensitive powder diffraction tomography
Parallax in angular sensitive powder diffraction tomography Open
While a few methods for the determination of depth-resolved strain distributions each with inherent limitations are available, tomographic reconstruction has been applied to this problem in only a limited sense. One of the challenges was t…
View article: Measurements of dislocations in 4H-SiC with rocking curve imaging
Measurements of dislocations in 4H-SiC with rocking curve imaging Open
4H Silicon Carbide (4H-SiC) combines many attractive properties such as a high carrier mobility, a wide bandgap, and a high thermal conductivity, making it an ideal candidate for high-power electronic devices. However, a primary challenge …
View article: Annular x-ray optics offer improved resolution for radiation sensitive samples
Annular x-ray optics offer improved resolution for radiation sensitive samples Open
To detect faint signals from weakly scattering samples, high-resolution x-ray microscopy typically requires a high photon flux. This exposes samples to high radiation doses and can cause radiation damage. In this work we propose the use of…
View article: Multi-modal strain mapping of steel crack tips with micrometer spatial resolution
Multi-modal strain mapping of steel crack tips with micrometer spatial resolution Open
Due to their superior fatigue strength, martensitic steels are the material of choice for high cyclic loading applications such as coil springs. However, crack propagation is influenced by residual stresses and their interaction is poorly …
View article: 3D evolution of protein networks and lipid globules in heat-treated egg yolk
3D evolution of protein networks and lipid globules in heat-treated egg yolk Open
Upon heating, egg yolk transforms from a liquid to a gel due to protein denaturation. This process can serve as a useful model to better understand protein denaturation in general. Using x-ray holographic tomography, we investigated the st…
View article: Texture tomography with high angular resolution utilizing sparsity
Texture tomography with high angular resolution utilizing sparsity Open
We demonstrate an approach to the reconstruction of scanning probe X-ray diffraction tomography data with anisotropic polycrystalline samples. The method involves reconstructing a voxel map containing an orientation distribution function i…
View article: Ultimate Sensitivity in X-ray Diffraction: Angular Moments vs. Shot Noise
Ultimate Sensitivity in X-ray Diffraction: Angular Moments vs. Shot Noise Open
The sensitivity of x-ray diffraction experiments towards Bragg peak parameters constitutes a crucial performance attribute of experimental setups. Frequently, diffraction peaks are characterized by model-free angular moment analysis, which…
View article: Measurements of dislocations in 4H-SiC with rocking curve imaging
Measurements of dislocations in 4H-SiC with rocking curve imaging Open
4H Silicon Carbide (4H-SiC) combines many attractive properties such as a high carrier mobility, a wide bandgap, and a high thermal conductivity, making it an ideal candidate for high-power electronic devices. However, a primary challenge …
View article: Parallax in angular sensitive powder diffraction tomography
Parallax in angular sensitive powder diffraction tomography Open
While a few methods for the determination of depth-resolved strain distributions each with inherent limitations are available, tomographic reconstruction has been applied to this problem in only a limited sense. One of the challenges was t…
View article: Annular x-ray optics offer superior resolution for radiation sensitive samples
Annular x-ray optics offer superior resolution for radiation sensitive samples Open
High-resolution x-ray microscopy requires a high photon flux to measure the signal from weakly scattering samples. This exposes samples to high radiation doses, potentially damaging or destroying them through radiation damage. In this work…
View article: Texture tomography with high angular resolution utilizing sparsity
Texture tomography with high angular resolution utilizing sparsity Open
We demonstrate a novel approach to the reconstruction of scanning probe x-ray diffraction tomography data with anisotropic poly crystalline samples. The method involves reconstructing a voxel map containing an orientation distribution func…
View article: Multi-contrast x-ray identification of inhomogeneous materials and their discrimination through deep learning approaches
Multi-contrast x-ray identification of inhomogeneous materials and their discrimination through deep learning approaches Open
Recent innovations in x-ray technology (namely phase-based and energy-resolved imaging) offer unprecedented opportunities for material discrimination; however, they are often used in isolation or in limited combinations. Here we show that …
View article: Multi-contrast x-ray identification of inhomogeneous materials and their discrimination through deep learning approaches
Multi-contrast x-ray identification of inhomogeneous materials and their discrimination through deep learning approaches Open
Recent innovations in x-ray technology (namely phase-based and energy-resolved imaging) offer unprecedented opportunities for material discrimination, however they are often used in isolation or in limited combinations. Here we show that t…
View article: Increased material differentiation through multi-contrast x-ray imaging: a preliminary evaluation of potential applications to the detection of threat materials
Increased material differentiation through multi-contrast x-ray imaging: a preliminary evaluation of potential applications to the detection of threat materials Open
Most material discrimination in security inspections is based on dual-energy x-ray imaging, which enables the determination of a material’s effective atomic number (Z eff ) as well as electron density and its consequent classification as o…
View article: Calibration of Scanning Acoustic Microscopy for the Differentiation between Unstable and Stable Atherosclerotic Plaques by X-Ray Fluorescence Imaging
Calibration of Scanning Acoustic Microscopy for the Differentiation between Unstable and Stable Atherosclerotic Plaques by X-Ray Fluorescence Imaging Open
View article: The diffraction volume for square-shaped samples in X-ray diffraction with high spatial resolution
The diffraction volume for square-shaped samples in X-ray diffraction with high spatial resolution Open
X-ray diffraction with high spatial resolution is a prerequisite for the characterization of (poly)-crystalline materials on micro- or nanoscopic scales. This can be achieved by utilizing a focused X-ray beam and scanning of the sample. Ho…
View article: X-ray diffraction with micrometre spatial resolution for highly absorbing samples
X-ray diffraction with micrometre spatial resolution for highly absorbing samples Open
X-ray diffraction with high spatial resolution is commonly used to characterize (poly)crystalline samples with, for example, respect to local strain, residual stress, grain boundaries and texture. However, the investigation of highly absor…
View article: Ptychographic reconstruction with object initialization
Ptychographic reconstruction with object initialization Open
X-ray ptychography is a cutting edge imaging technique providing ultra-high spatial resolutions. In ptychography, phase retrieval, i.e., the recovery of a complex valued signal from intensity-only measurements, is enabled by exploiting a r…
View article: Object Initialization For Ptychographic Scans With Reduced Overlap
Object Initialization For Ptychographic Scans With Reduced Overlap Open
X-ray ptychography utilizes overlapping illuminations to reconstruct the object's phase and absorption signal with spatial resolutions much smaller than the focus size. Usually, the illumination overlap is chosen to be between 50% and 60% …
View article: Defect detection in glass fabric reinforced thermoplastics by laboratory-based X-ray scattering
Defect detection in glass fabric reinforced thermoplastics by laboratory-based X-ray scattering Open
Glass fabric reinforced thermoplastic (GFRT) constitutes a class of composite materials that are especially suited for automobile construction due to their combination of low weight, ease of production and mechanical properties. However, i…
View article: Ptychographic reconstruction with wavefront initialization
Ptychographic reconstruction with wavefront initialization Open
X-ray ptychography is a cutting edge imaging technique providing ultra-high spatial resolutions. In ptychography, phase retrieval, i.e., the recovery of a complex valued signal from intensity-only measurements, is enabled by exploiting a r…
View article: The diffraction volume for square-shaped samples in X-ray diffraction\n with high spatial resolution
The diffraction volume for square-shaped samples in X-ray diffraction\n with high spatial resolution Open
X-ray diffraction with high spatial resolution is a prerequisite for the\ncharacterization of (poly)-crystalline materials on micro- or nanoscopic\nscales. This can be achieved by utilizing a focused X-ray beam and scanning of\nthe sample.…
View article: Calibration of scanning acoustic microscopy for the differentiation between unstable and stable atherosclerotic plaques by X-ray fluorescence imaging
Calibration of scanning acoustic microscopy for the differentiation between unstable and stable atherosclerotic plaques by X-ray fluorescence imaging Open
Although cardiovascular diseases are the leading cause of death globally, non-invasive and inexpensive diagnostic tools for the identification of associated unstable atherosclerotic plaques are not yet available. Scanning acoustic microsco…
View article: Accelerated iterative tomographic reconstruction with x-ray edge illumination
Accelerated iterative tomographic reconstruction with x-ray edge illumination Open
Compared to standard tomographic reconstruction, iterative approaches offer the possibility to account for extraneous experimental influences, which allows for a suppression of related artifacts. However, the inclusion of corresponding par…
View article: Improved iterative tomographic reconstruction for x-ray imaging with edge-illumination
Improved iterative tomographic reconstruction for x-ray imaging with edge-illumination Open
Iterative tomographic reconstruction has been established as a viable alternative for data analysis in phase-sensitive x-ray imaging based on the edge-illumination principle. However, previously published approaches did not account for dri…
View article: Dataset for "Dissecting abdominal aortic aneurysm in Ang II-infused mice: suprarenal branch ruptures and apparent luminal dilatation"
Dataset for "Dissecting abdominal aortic aneurysm in Ang II-infused mice: suprarenal branch ruptures and apparent luminal dilatation" Open
This dataset contains histology, synchrotron and ultrasound data for the manuscript "Dissecting abdominal aortic aneurysm in Ang II-infused mice: suprarenal branch ruptures and apparent luminal dilatation", published in Cardiovascular Rese…