Mats Danielsson
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View article: Syn2Real: synthesis of CT image ring artifacts for deep learning-based correction
Syn2Real: synthesis of CT image ring artifacts for deep learning-based correction Open
Objective . We strive to overcome the challenges posed by ring artifacts in x-ray computed tomography (CT) by developing a novel approach for generating training data for deep learning-based methods. Training such networks require large, h…
View article: The impact of tube voltage on the erosion of rotating x‐ray anodes
The impact of tube voltage on the erosion of rotating x‐ray anodes Open
Background The permitted input power density of rotating anode x‐ray sources is limited by the performance of available target materials. The commonly used simplified formulas for the focal spot surface temperature ignore the tube voltage …
View article: Nearly Monochromatic Bremsstrahlung of High Intensity via Microparticle Targets: A Novel Concept
Nearly Monochromatic Bremsstrahlung of High Intensity via Microparticle Targets: A Novel Concept Open
As an alternative to rigid anodes, a novel concept of X-ray targets consisting of a stream or a multitude of streams of fast tungsten microparticles has recently been proposed. Low-density microparticle streams resemble thin targets with n…
View article: Microparticle Hybrid Target Simulation for keV X-ray Sources
Microparticle Hybrid Target Simulation for keV X-ray Sources Open
The spatiotemporal resolution of diagnostic X-ray images obtained with rotating-anode X-ray tubes has remained limited as the development of rigid, high-performance target materials has slowed down. However, novel imaging techniques using …
View article: First experimental evaluation of a high-resolution deep silicon photon-counting sensor
First experimental evaluation of a high-resolution deep silicon photon-counting sensor Open
The agreement between measurements and simulations indicates that the Monte-Carlo simulation can accurately model the channel response of the detector with the photon interactions close to the electrodes, which indicates that the unconnect…
View article: First Experimental Evaluation of a High-Resolution Deep Silicon Photon-Counting Sensor
First Experimental Evaluation of a High-Resolution Deep Silicon Photon-Counting Sensor Open
Purpose: Current photon-counting computed tomography detectors are limited to a pixel size of around 0.3 mm-0.5 mm due to excessive charge sharing degrading the dose efficiency and energy resolution as the pixels become smaller. In this wo…
View article: Analyzer-free hard x-ray interferometry
Analyzer-free hard x-ray interferometry Open
Objective . To enable practical interferometry-based phase contrast CT using standard incoherent x-ray sources, we propose an imaging system where the analyzer grating is replaced by a high-resolution detector. Since there is no need to pe…
View article: First experimental evaluation of count-rate performance for micrometre resolution deep silicon detector
First experimental evaluation of count-rate performance for micrometre resolution deep silicon detector Open
Objective. An ultra-fine-pitch deep silicon detector has been developed for clinical photon-counting computed tomography (CT). With a small pixel size of 14 × 650 μ m 2 , it has shown potential to reach micrometre spatial resolution in pre…
View article: First experimental evaluation of count-rate performance for micrometre resolution deep silicon detector
First experimental evaluation of count-rate performance for micrometre resolution deep silicon detector Open
This is the data used for the publication Z. Jin, R. Brunskog, M. Danielsson, and M. Persson, “First experimental evaluation of count-rate performance for micrometre resolution deep silicon detector”, Phys. Med. Biol., accepted for publica…
View article: Data for "First experimental evaluation of count-rate performance for micrometre resolution deep silicon detector"
Data for "First experimental evaluation of count-rate performance for micrometre resolution deep silicon detector" Open
This is the data used for the publication Z. Jin, R. Brunskog, M. Danielsson, and M. Persson, “First experimental evaluation of count-rate performance for micrometre resolution deep silicon detector”, Phys. Med. Biol., accepted for publica…
View article: Data for "First experimental evaluation of count-rate performance for micrometre resolution deep silicon detector"
Data for "First experimental evaluation of count-rate performance for micrometre resolution deep silicon detector" Open
This is the data used for the publication Z. Jin, R. Brunskog, M. Danielsson, and M. Persson, “First experimental evaluation of count-rate performance for micrometre resolution deep silicon detector”, Phys. Med. Biol., accepted for publica…
View article: PPFM: Image denoising in photon-counting CT using single-step posterior sampling Poisson flow generative models
PPFM: Image denoising in photon-counting CT using single-step posterior sampling Poisson flow generative models Open
Diffusion and Poisson flow models have shown impressive performance in a wide range of generative tasks, including low-dose CT image denoising. However, one limitation in general, and for clinical applications in particular, is slow sampli…
View article: Noise suppression in photon-counting CT using unsupervised Poisson flow generative models
Noise suppression in photon-counting CT using unsupervised Poisson flow generative models Open
Deep learning has proven to be important for CT image denoising. However, such models are usually trained under supervision, requiring paired data that may be difficult to obtain in practice. Diffusion models offer unsupervised means of so…
View article: Constrained one‐step material decomposition reconstruction of head CT data from a silicon photon‐counting prototype
Constrained one‐step material decomposition reconstruction of head CT data from a silicon photon‐counting prototype Open
Background Spectral CT material decomposition provides quantitative information but is challenged by the instability of the inversion into basis materials. We have previously proposed the constrained One‐Step Spectral CT Image Reconstructi…
View article: Timing resolution in double-sided silicon photon-counting computed tomography detectors
Timing resolution in double-sided silicon photon-counting computed tomography detectors Open
Time resolution in edge-on silicon strip CT detectors can potentially be used to increase the signal-to-noise-ratio and energy resolution by helping in identifying Compton scattered photons in the detector.
View article: Compton coincidence in silicon photon-counting CT detectors
Compton coincidence in silicon photon-counting CT detectors Open
Purpose: Compton interactions amount to a significant fraction of the registered counts in a silicon detector. In a Compton interaction, only a part of the photon energy is deposited and a single incident photon can result in multiple coun…
View article: 1-μm spatial resolution in silicon photon-counting CT detectors
1-μm spatial resolution in silicon photon-counting CT detectors Open
Purpose: Spatial resolution for current scintillator-based computed tomography (CT) detectors is limited by the pixel size of about 1 mm. Direct conversion photon-counting detector prototypes with silicon- or cadmium-based detector materia…
View article: Detectors for the future of X-ray imaging
Detectors for the future of X-ray imaging Open
In recent decades, developments in detectors for X-ray imaging have improved dose efficiency. This has been accomplished with for example, structured scintillators such as columnar CsI, or with direct detectors where the X rays are convert…
View article: Photon-counting x-ray detectors for CT
Photon-counting x-ray detectors for CT Open
The introduction of photon-counting detectors is expected to be the next major breakthrough in clinical x-ray computed tomography (CT). During the last decade, there has been considerable research activity in the field of photon-counting C…
View article: Silicon photon-counting detector for full-field CT using an ASIC with adjustable shaping time
Silicon photon-counting detector for full-field CT using an ASIC with adjustable shaping time Open
Purpose: Photon-counting silicon strip detectors are attracting interest for use in next-generation CT scanners. For CT detectors in a clinical environment, it is desirable to have a low power consumption. However, decreasing the power con…
View article: Resolution characterization of a silicon-based, photon-counting computed tomography prototype capable of patient scanning
Resolution characterization of a silicon-based, photon-counting computed tomography prototype capable of patient scanning Open
Photon-counting detectors are expected to bring a range of improvements to patient imaging with x-ray computed tomography (CT). One is higher spatial resolution. We demonstrate the resolution obtained using a commercial CT scanner where th…
View article: Applying three different methods of measuring <i>CTDI</i><sub><i>free air</i></sub> to the extended <scp>CTDI</scp> formalism for wide‐beam scanners (<scp>IEC</scp> 60601–2–44): A comparative study
Applying three different methods of measuring <i>CTDI</i><sub><i>free air</i></sub> to the extended <span>CTDI</span> formalism for wide‐beam scanners (<span>IEC</span> 60601–2–44): A comparative study Open
Purpose The weighted CT dose index ( CTDI w ) has been extended for a nominal total collimation width ( nT ) greater than 40 mm and relies on measurements of . The purpose of this work was to compare three methods of measuring and subseque…
View article: Robustness of Optimal Energy Thresholds in Photon-counting Spectral CT
Robustness of Optimal Energy Thresholds in Photon-counting Spectral CT Open
An important question when developing photon-counting detectors for computed tomography is how to select energy thresholds. In this work thresholds are optimized by maximizing signal-difference-to-noise ratio squared (SDNR2) in an optimall…
View article: Compression of CT sinogram data by decimation in the view direction
Compression of CT sinogram data by decimation in the view direction Open
Pupose In clinical computed tomography ( CT ), the image data is acquired during continuous rotation. If the time during which the signal is integrated (the frame time) is too long, the data is blurred in the view direction (i.e., azimutha…
View article: Lesion characterization in spectral photon-counting tomosynthesis
Lesion characterization in spectral photon-counting tomosynthesis Open
It has previously been shown that 2D spectral mammography can be used to\ndiscriminate between (likely benign) cystic and (potentially malignant) solid\nlesions in order to reduce unnecessary recalls in mammography. One limitation\nof the …
View article: Errata: Spectral response model for a multibin photon-counting spectral computed tomography detector and its applications
Errata: Spectral response model for a multibin photon-counting spectral computed tomography detector and its applications Open
The Journal of Medical Imaging (JMI) allows for the peer-reviewed communication and archiving of fundamental and translational research, as well as applications, focused on medical imaging, a field that continues to benefit from technologi…