A5010548015- Advanced X-ray Imaging Techniques
- Medical Imaging Techniques and Applications
- Wood Treatment and Properties
- Astrophysical Phenomena and Observations
- Advanced X-ray and CT Imaging
- Material Properties and Processing
- Nuclear Physics and Applications
- Scientific Computing and Data Management
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Electron Microscopy Techniques and Applications
- Manufacturing Process and Optimization
- Pediatric Urology and Nephrology Studies
- Laser-Plasma Interactions and Diagnostics
- Plant Parasitism and Resistance
- Mechanical Behavior of Composites
- Colorectal Cancer Screening and Detection
- Integrated Circuits and Semiconductor Failure Analysis
- Natural Fiber Reinforced Composites
- Advanced MRI Techniques and Applications
- Cultural Heritage Materials Analysis
- Optical measurement and interference techniques
- Insect and Arachnid Ecology and Behavior
- Insect symbiosis and bacterial influences
Argonne National Laboratory
2018-2023
Oregon State University
2016-2018
Forest Products Laboratory
2018
There is a widening gap between the fast advancement of computational methods for tomographic reconstruction and their successful implementation in production software at various synchrotron facilities. This due part to lack readily available instrument datasets phantoms representative real materials validation comparison new numerical methods.
Coherent imaging techniques provide an unparalleled multi-scale view of materials across scientific and technological fields, from structural to quantum devices, integrated circuits biological cells. Driven by the construction brighter sources high-rate detectors, coherent methods like ptychography are poised revolutionize nanoscale characterization. However, these advancements accompanied significant increase in data compute needs, which precludes real-time imaging, feedback decision-making...
We present the extension of ptychography for three-dimensional object reconstruction in a tomography setting. describe alternating direction method multipliers (ADMM) as generic framework to efficiently solve nonlinear optimization problem. In this framework, ADMM breaks joint problem into two well-defined subproblems: ptychographic phase retrieval and tomographic reconstruction. paper, we use gradient descent algorithm both problems demonstrate efficiency proposed approach through numerical...
While the advances in synchrotron light sources, together with development of focusing optics and detectors, allow nanoscale ptychographic imaging materials biological specimens, corresponding experiments can yield terabyte-scale large volumes data that impose a heavy burden on computing platform. Graphical Processing Units (GPUs) provide high performance for such large-scale ptychography datasets, single GPU is typically insufficient analysis reconstruction. Several existing works have...
The development of new methods or utilization current X-ray computed tomography is impeded by the substantial amount expertise required to design an experiment from beginning end. In attempt make material models, data acquisition schemes and reconstruction algorithms more accessible researchers lacking in some these areas, a software package described here which can generate complex simulated phantoms quantitatively evaluate existing image for targeted applications.
We present an end-to-end automated workflow that uses large-scale remote compute resources and embedded GPU platform at the edge to enable AI/ML-accelerated real-time analysis of data collected for x-ray ptychography. Ptychography is a lensless method being used image samples through simultaneous numerical inversion large number diffraction patterns from adjacent overlapping scan positions. This acquisition can nanoscale imaging with x-rays electrons, but this often requires very...
We investigate the effects of angular diversity on image-reconstruction quality scanning-probe x-ray tomography for both fly- and step-mode data collection. propose probe-coverage maps as a tool visualizing quantifying distribution probe interactions with object. show that sampling more yields better tomographic image reconstruction long it does not come at cost covering some voxels in Therefore, fly-mode collection, rotation-as-fast-axis (RAFA) trajectories are superior to raster or other...
Abstract The development of new and improved wood adhesives is hindered by an incomplete mechanistic understanding what makes a wood–adhesive bond able to withstand changes in moisture levels. Although common methods are established test report the bulk-level properties lines, such as bond-line shear strength failure analysis, experimental tools study lines effects at nanometer millimeter length scales remains active area research. Here we introduce briefly review four recently developed...
We describe a computational imaging system for x-ray tomography, where image capture and post-processing are co-designed to improve final quality when relative motion of an experiment’s components during single exposure causes blur. The idea is based on temporally encoding the each by fluttering detector shutter open closed with known sequence guaranteeing invertible blur kernel. While generally applicable, we demonstrate our approach simulating blurry data acquisition transmission...
Ptychography is a powerful imaging technique that used in variety of fields, including materials science, biology, and nanotechnology. However, the accuracy reconstructed ptychography image highly dependent on recorded probe positions which often contain errors. These errors are typically corrected jointly with phase retrieval through numerical optimization approaches. When error accumulates along scan path or when magnitude large, these approaches may not converge satisfactory result. We...
Ptychography is a powerful imaging technique that used in variety of fields, including materials science, biology, and nanotechnology. However, the accuracy reconstructed ptychography image highly dependent on recorded probe positions which often contain errors. These errors are typically corrected jointly with phase retrieval through numerical optimization approaches. When error accumulates along scan path or when magnitude large, these approaches may not converge satisfactory result. We...
We present an end-to-end automated workflow that uses large-scale remote compute resources and embedded GPU platform at the edge to enable AI/ML-accelerated real-time analysis of data collected for x-ray ptychography. Ptychography is a lensless method being used image samples through simultaneous numerical inversion large number diffraction patterns from adjacent overlapping scan positions. This acquisition can nanoscale imaging with x-rays electrons, but this often requires very...
Coherent microscopy techniques provide an unparalleled multi-scale view of materials across scientific and technological fields, from structural to quantum devices, integrated circuits biological cells. Driven by the construction brighter sources high-rate detectors, coherent X-ray methods like ptychography are poised revolutionize nanoscale characterization. However, associated significant increases in data compute needs mean that conventional approaches no longer suffice for recovering...
Previous studies have shown that the frequency content of an illumination affects convergence rate and reconstruction quality ptychographic reconstructions. In this numerical study, we demonstrate structuring a large as modified uniformly redundant array (MURA) can yield higher resolution faster for ptychography by improving signal-to-noise ratio high spatial frequencies in far-field diffraction pattern.
Beamlines at synchrotron light source facilities are powerful scientific instruments used to image samples and observe phenomena high spatial temporal resolutions. Typically, these equipped only with modest compute resources for the analysis of generated experimental datasets. However, data rate experiments can easily generate in volumes that take days (or even weeks) process on those local resources. To address this challenge, we present a system unifies leadership computing by enabling...
Recent developments in 4th generation light sources and high-speed detectors are leading to rapid growth data rates volumes, increasing the demand for automated collection, handling/reduction/storage, analysis processes.In combination with limited in-person access experimental setups times of pandemic, portable user-friendly tools remote as well improved workflows critical enabling scientists from various disciplines leverage ptychographic imaging answer scientific questions.With growing...