A5008231285- Medical Imaging Techniques and Applications
- Advanced X-ray and CT Imaging
- Advanced X-ray Imaging Techniques
- Advanced MRI Techniques and Applications
- Historical and Archaeological Studies
- Ancient Mediterranean Archaeology and History
- Ancient and Medieval Archaeology Studies
- Radiation Detection and Scintillator Technologies
- Radiation Dose and Imaging
- Nuclear Physics and Applications
- Advanced Radiotherapy Techniques
- Radiomics and Machine Learning in Medical Imaging
- Terahertz technology and applications
- X-ray Spectroscopy and Fluorescence Analysis
- Medical Image Segmentation Techniques
- Industrial Vision Systems and Defect Detection
- Archaeology and ancient environmental studies
- Optical measurement and interference techniques
- Additive Manufacturing Materials and Processes
- Electron and X-Ray Spectroscopy Techniques
- Digital Radiography and Breast Imaging
- Image Processing and 3D Reconstruction
- Advanced Electron Microscopy Techniques and Applications
- Spectroscopy and Chemometric Analyses
- Advanced Materials Characterization Techniques
University of Antwerp
2016-2025
Imec the Netherlands
2023
Photon Imaging (United States)
2023
University of Massachusetts Chan Medical School
2018
iMinds
2014-2016
Ghent University
2005-2011
New York State Psychiatric Institute
2010
New York Psychoanalytic Society and Institute
2010
Ghent University Hospital
2004-2006
KU Leuven
2005
Object reconstruction from a series of projection images, such as in computed tomography (CT), is popular tool many different application fields. Existing commercial software typically provides sufficiently accurate and convenient-to-use tools to the end-user. However, applications where non-standard acquisition protocol used, or advanced methods are required, standard often incapable computing images. This article introduces ASTRA Toolbox. Aimed at researchers across multiple tomographic...
The three-dimensional (3D) atomic structure of nanomaterials, including strain, is crucial to understand their properties. Here, we investigate lattice strain in Au nanodecahedra using electron tomography. Although different tomography techniques enabled 3D characterizations nanostructures at the level, a reliable determination not straightforward. We therefore propose novel model-based approach from which coordinates are measured. Our findings demonstrate importance investigating 3D.
In X-ray imaging, it is common practice to normalize the acquired projection data with averaged flat fields taken prior scan.Unfortunately, due source instabilities, vibrating beamline components such as monochromator, time varying detector properties, or other confounding factors, are often far from stationary, resulting in significant systematic errors intensity normalization.In this work, a simple and efficient method proposed account for dynamically fields.Through principal component...
Laboratory based X-ray micro-CT is a non-destructive testing method that enables three dimensional visualization and analysis of the internal external morphology samples. Although wide variety commercial scanners exist, most them are limited in number degrees freedom to position source detector with respect object be scanned. Hence, they less suited for industrial imaging settings require advanced scanning modes, such as laminography, conveyor belt scanning, or time-resolved (4DCT). We...
Edge illumination is an X-ray phase contrast imaging technique that introduces two absorbing masks with slit-shaped apertures in the setup. During edge acquisition, a pixel-wise intensity profile measured by acquiring projections at several different mask aperture alignments. The difference peak position between acquisitions and without sample yields refraction contrast. However, itself depends on source focal spot position. In many lab sources, of can drift over time, causing corresponding...
This paper addresses the challenge of tomographic reconstruction from a limited number views by using learning-based approaches. Recent advancements in Plug-and-Play (PnP) algorithms have shown promise for solving imaging inverse problems utilizing capabilities Gaussian denoising to handle complex optimization tasks. Traditional hand-crafted methods produce images with predictable features but require intricate parameter tuning and suffer slow convergence. In contrast, models offer faster...
This study presents a novel micro-electrode-based measurement system designed for in-depth electrical impedance imaging of in-vitro tissue models. Preliminary regarding the influence electrode size and density on quality is carried out in this work. In addition to apparatus, we introduce memory-efficient technique capable producing high-resolution 3D (conductivity) reconstruction. The performance proposed validated through simulations experimental evaluations, demonstrating its significant...
In recent years, the complementary nature of multi-contrast imaging has increased popularity x-ray phase contrast imaging, including edge illumination. However, illumination system optimization most often relies on and transmission only, without considering dark field contrast. Computer simulations are a widespread approach to design optimize systems, benchmarking simulation results, i.e., comparison reference value. Providing such is, however, particularly challenging for signal. this work,...
In this work, we apply and adapt established probability of detection (POD) methods on the in-line inspection aluminium cylinder heads using X-ray computed tomography (XCT). We propose to use XCT simulation tool SimCT simulate virtual radiographs from specimen including artificial defects, which avoids manufacturing specimens with calibrated defects known type (e.g. pores, inclusions, cracks) characteristics size, shape, location). To quantify POD, these images are analysed ZEISS automated...
I-131 is a frequently used isotope for radionuclide therapy. This technique cancer treatment requires pre-therapeutic dosimetric study. The latter usually performed (for this radionuclide) by directly imaging the uptake of therapeutic in body or replacing it one its isotopes, which are more suitable imaging. study aimed to compare image quality that can be achieved three iodine isotopes: and I-123 single-photon emission computed tomography imaging, I-124 positron characteristics each were...
The overall importance of x-ray phase contrast (XPC) imaging has grown substantially in the last decades, particular with recent advent compact lab-based XPC systems. For optimizing experimental setup, as well benchmarking and testing new acquisition reconstruction techniques, Monte Carlo (MC) simulations are a valuable tool. GATE, an open source application layer on top Geant4 simulation software, is versatile MC tool primarily intended for various types medical simulations. To our...
Radiography is a common imaging method for non-destructive object inspection. Processing radiographs to detect defects is, however, challenging, especially if the defect type and location are unknown. In other fields, autoencoders (AE) have been largely studied anomaly detection. While their performance detection has shown promise, many solutions not demonstrated be defect-independent. this work, we introduce radiography-based that first computes AE prediction error from an input radiograph...
Edge illumination x-ray phase contrast imaging (XPCI) provides increased for low absorbing materials compared to attenuation images and sheds light on the material microstructure through dark field contrast. To apply XPCI in areas such as non-destructive testing inline inspection, where scanned samples are increasingly simulated reference images, accurate efficient simulation software is required. However, currently available simulators rely expensive Monte Carlo techniques or wave-optics...
Abstract Accurate 3D mesh registration is essential in many industrial applications of X-ray imaging, as it allows quality assessment and inspection manufactured objects. Conventional methods rely mainly on time-consuming expensive computed tomography (X-CT) or ancillary camera systems. Instead, we propose a novel approach for efficient multi-mesh few-view imaging scenarios. Our harnesses the capabilities CAD-ASTRA, an projector, compatible with ASTRA toolbox popular GPU libraries such CuPy...
Purpose Several studies have shown the benefit of an accurate system modeling using Monte Carlo techniques. For state‐of‐the‐art whole‐body positron emission tomography (PET) scanners, Carlo‐based image reconstruction is associated with a significant computational cost to calculate matrix as well large memory capacity store it. In this article, authors present simulation‐reconstruction framework solve these problems on Philips Gemini GS PET scanner. Methods A fast, realistic simulation...
Accurate and fast simulation of X-ray projection data from mesh models has many applications in academia industry, ranging 3D computed tomography (XCT) reconstruction algorithms to radiograph-based object inspection quality control. While software tools for the are available, they lack either performance, public availability, flexibility implement non-standard scanning geometries, or easy integration with existing XCT software. In this paper, we propose CAD-ASTRA, a highly versatile toolbox...
Geant4 application for tomographic emission (GATE) is a geometry and tracking 4 (Geant4) toolkit accurate simulation of positron tomography single photon computed (SPECT) scanners. GATE simulations with realistic count levels are very CPU‐intensive as they take up to several days single‐CPU computers. Therefore, we implemented both standard forced detection (FD) convolution‐based (CFD) multiple projection sampling, which allows the all projections simultaneously in GATE. In addition, FD CFD...
Today, new single photon emission computed tomography (SPECT) reconstruction techniques rely on accurate Monte Carlo (MC) simulations to optimize reconstructed images. However, existing MC scintillation camera models which usually include an description of the collimator and crystal, lack correct implementation gamma camera's back compartments. In case dual isotope simultaneous acquisition (DISA), where backscattered photons from highest energy are detected in imaging window second isotope,...
X-ray computed tomography (XCT) is one of the most powerful imaging techniques in non-destructive testing (NDT) for detecting, analysing and visualising defects such as pores, fibres, cracks etc. industrial specimens. Detecting images, however, still a challenging problem, it strongly depends on quality XCT images. Numerical simulation proved to be valuable order increase both image detection performance. In this work, we thus analyse differences between traditional segmentation (i.e.,...
Purpose Multiple investigators have recently reported the use of yttrium‐90 bremsstrahlung single photon emission computed tomography (SPECT) imaging for dosimetry targeted radionuclide therapies. Because Monte Carlo (MC) simulations are useful studying SPECT imaging, this study investigates MC simulation photons in SPECT. To overcome computationally expensive electrons, authors propose a fast way to simulate based on prerecorded probability density functions (PDFs). Methods The accuracy is...
Speed is an important parameter of inspection system. Inline computed tomography systems exist but are generally expensive. Moreover, their throughput limited by the speed reconstruction algorithm. In this work, we propose a Neural Network-based Hilbert transform Filtered Backprojection (NN-hFBP) method to reconstruct objects in inline scanning environment fast and accurate way. Experiments based on apple X-ray scans show that NN-hFBP allows images with substantially better tradeoff between...