A5061957501- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Theoretical and Computational Physics
- Particle physics theoretical and experimental studies
- Black Holes and Theoretical Physics
- Quantum Chromodynamics and Particle Interactions
- Stochastic processes and statistical mechanics
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Advanced Thermodynamics and Statistical Mechanics
- Quantum many-body systems
- Complex Network Analysis Techniques
- Markov Chains and Monte Carlo Methods
- Complex Systems and Time Series Analysis
- Cosmology and Gravitation Theories
- Quantum Mechanics and Applications
- Noncommutative and Quantum Gravity Theories
- Advanced MRI Techniques and Applications
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Quantum Information and Cryptography
- Opinion Dynamics and Social Influence
- Radiomics and Machine Learning in Medical Imaging
Jagiellonian University
2011-2024
Goethe University Frankfurt
2018-2024
Silesian University of Technology
2023
Institute of Physics
2002-2019
University of Silesia in Katowice
2018-2019
Sapienza University of Rome
2019
TU Dresden
2016
Ludwig-Maximilians-Universität München
2016
Polish Academy of Sciences
2016
Maria Curie-Skłodowska University
2015
The Jagiellonian Positron Emission Tomograph (J-PET) is the first PET built from plastic scintillators.J-PET prototype consists of 192 detection modules arranged axially in three layers forming a cylindrical diagnostic chamber with inner diameter 85 cm and axial field-of-view 50 cm.An arrangement long strips scintillators, their small light attenuation, superior timing properties, relative ease increase opens promising perspectives for cost effective construction whole-body scanner, as well...
In this article it is presented an FPGA based $M$ulti-$V$oltage $T$hreshold (MVT) system which allows of sampling fast signals ($1-2$ ns rising and falling edge) in both voltage time domain. It possible to achieve a precision measurement $20$ ps RMS reconstruct charge signals, using simple approach, with deviation from real value smaller than 10$\%$. Utilization the differential inputs chip as comparators together implementation TDC inside allowed us compact multi-channel characterized by...
A novel approach to tomographic data processing has been developed and evaluated using the Jagiellonian PET (J-PET) scanner as an example. We propose a system in which there is no need for powerful, local facility, capable reconstruct images on fly. Instead we introduce Field Programmable Gate Array (FPGA) System-on-Chip (SoC) platform connected directly streams coming from scanner, can perform event building, filtering, coincidence search Region-Of-Response (ROR) reconstruction by...
Recent tests of a single module the Jagiellonian Positron Emission Tomography system (J-PET) consisting 30 cm long plastic scintillator strips have proven its applicability for detection annihilation quanta (0.511 MeV) with coincidence resolving time (CRT) 0.266 ns. The achieved resolution is almost by factor two better respect to current TOF-PET detectors and it can still be improved since, as shown in this article, intrinsic limit determination interaction 0.511 MeV gamma scintillators...
We present a study of the application Jagiellonian positron emission tomograph (J-PET) for registration gamma quanta from decays ortho-positronium (o-Ps). The J-PET is first tomography scanner based on organic scintillators in contrast to all current PET scanners inorganic crystals. Monte Carlo simulations show that as an axially symmetric and high acceptance can be used multi-purpose detector well suited pursue research including e.g. tests discrete symmetries addition medical imaging....
We provide a deepened study of autocorrelations in neural Markov chain Monte Carlo (NMCMC) simulations, version the traditional Metropolis algorithm which employs networks to independent proposals. illustrate our ideas using two-dimensional Ising model. discuss several estimates autocorrelation times context NMCMC, some inspired by analytical results derived for Metropolized sampler (MIS). check their reliability estimating them on small system where can also be obtained. Based MIS, we...
The Jagiellonian Positron Emission Tomograph (J-PET) was constructed as a prototype of the cost-effective scanner for simultaneous metabolic imaging whole human body. Being optimized detection photons from electron-positron annihilation with high time- and angular-resolution, it constitutes multi-purpose detector providing new opportunities studying decays positronium atoms. Positronium is lightest purely leptonic object decaying into photons. As an atom bound by central potential parity...
In this paper, we present a complete Data Acquisition System (DAQ) together with the readout mechanisms for J-PET tomography scanner.In general, detector chain is constructed out of Front-End Electronics (FEE) measurement devices such as Time-to-Digital or Analog-to-Digital Converters (TDCs ADCs), data collectors and storage.We have developed system capable maintaining continuous digitized without preliminary selection.Such operation mode results in up to 8 Gbps stream, therefore, it...
In this paper we estimate the time resolution of J-PET scanner built from plastic scintillators. We incorporate method signal processing using Tikhonov regularization framework and kernel density estimation method. obtain simple, closed-form analytical formulae for resolution. The proposed is validated signals registered by means single detection unit tomograph a 30 cm long scintillator strip. It shown that experimental theoretical results obtained equipped with vacuum tube photomultipliers...
There is much speculation and a modest amount of evidence that certain mesons might form quasi-bound states with nuclei to produce really exotic matter.For this be practical possibility, the interaction between meson nucleons at low energies must strong attractive production rates "healthy".The conditions for are surveyed K, η, ω, η , φ mesons.How lead then discussed in few typical cases.Though some interesting effects have been seen above-threshold data, search experimental signals these...
We study the properties of giant connected component in random graphs with arbitrary degree distribution. concentrate on degree-degree correlations. show that adjoining nodes are correlated and derive analytic formulas for joint nearest-neighbor probability Using those results we describe correlations maximal entropy graphs. disassortative strongly related to presence one-degree (leaves). propose an efficient algorithm generating illustrate our several examples.
Abstract This article presents an application of a novel technique for precise measurements time and charge based solely on field programmable gate array (FPGA) device positron emission tomography (PET). The described approach simplifies electronic circuits, reduces the power consumption, lowers costs, merges front-end electronics with digital electronics, also makes more compact final design. Furthermore, it allows to measure when analog signals cross reference voltage at different...
J-PET analysis framework is a exible, lightweight, ROOT-based software package which provides the tools to develop reconstruction and calibration procedures for PET tomography.In this article we present implementation of full data-processing chain in used data tomography scanner.The incorporates automated handling setup parameters' database as well high level building procedures.Each these components briey discussed.
A geometry of networks endowed with a causal structure is discussed using the conventional framework equilibrium statistical mechanics. The popular growing network models appear as particular models. We focus on class tree graphs, an analytically solvable case. General formulas are derived, describing degree distribution, ancestor-descendant correlation, and probability that randomly chosen node lives at given geodesic distance from root. It shown Hausdorff dimension d(H) generically...