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  1. AU="Wiślicki, W."
  2. AU="Veiga, Susana"
  3. AU="Reynolds, Matthew W."
  4. AU="Oates, Stephen B"
  5. AU=Okubo K
  6. AU="Behnood, Sanaz"

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  1. Buch ; Online: Autonomous tools for Grid management, monitoring and optimization

    Wislicki, Wojciech

    2007  

    Abstract: We outline design and lines of development of autonomous tools for the computing Grid management, monitoring and optimization. The management is proposed to be based on the notion of utility. Grid optimization is considered to be application-oriented. A ... ...

    Abstract We outline design and lines of development of autonomous tools for the computing Grid management, monitoring and optimization. The management is proposed to be based on the notion of utility. Grid optimization is considered to be application-oriented. A generic Grid simulator is proposed as an optimization tool for Grid structure and functionality.

    Comment: The original version of this proposal was created on 22nd March 2006, published as the ICM UW preprint and registered in the bibliographic database of the University of Warsaw on the following Internet address: http://bibliografia.icm.edu.pl/g2/main.pl?mod=p&id=51470&t=1&tytul=Autonomous&lim=100⩝=1
    Schlagwörter Computer Science - Distributed ; Parallel ; and Cluster Computing ; Computer Science - Computational Engineering ; Finance ; and Science ; High Energy Physics - Experiment
    Erscheinungsdatum 2007-07-22
    Erscheinungsland us
    Dokumenttyp Buch ; Online
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  2. Artikel: Efficiency determination of J-PET: first plastic scintillators-based PET scanner.

    Sharma, S / Baran, J / Chug, N / Curceanu, C / Czerwiński, E / Dadgar, M / Dulski, K / Eliyan, K / Gajos, A / Gupta-Sharma, N / Hiesmayr, B C / Kacprzak, K / Kapłon, Ł / Klimaszewski, K / Konieczka, P / Korcyl, G / Kozik, T / Krzemień, W / Kumar, D /
    Niedźwiecki, Sz / Panek, D / Parzych, S / Del Rio, E Perez / Raczyński, L / Choudhary, Shivani / Shopa, R Y / Skurzok, M / Stępień, E Ł / Tayefi, F / Tayefi, K / Wiślicki, W / Moskal, P

    EJNMMI physics

    2023  Band 10, Heft 1, Seite(n) 28

    Abstract: Background: The Jagiellonian Positron Emission Tomograph is the 3-layer prototype of the first scanner based on plastic scintillators, consisting of 192 half-metre-long strips with readouts at both ends. Compared to crystal-based detectors, plastic ... ...

    Abstract Background: The Jagiellonian Positron Emission Tomograph is the 3-layer prototype of the first scanner based on plastic scintillators, consisting of 192 half-metre-long strips with readouts at both ends. Compared to crystal-based detectors, plastic scintillators are several times cheaper and could be considered as a more economical alternative to crystal scintillators in future PETs. JPET is also a first multi-photon PET prototype. For the development of multi-photon detection, with photon characterized by the continuous energy spectrum, it is important to estimate the efficiency of J-PET as a function of energy deposition. The aim of this work is to determine the registration efficiency of the J-PET tomograph as a function of energy deposition by incident photons and the intrinsic efficiency of the J-PET scanner in detecting photons of different incident energies. In this study, 3-hit events are investigated, where 2-hits are caused by 511 keV photons emitted in [Formula: see text] annihilations, while the third hit is caused by one of the scattered photons. The scattered photon is used to accurately measure the scattering angle and thus the energy deposition. Two hits by a primary and a scattered photon are sufficient to calculate the scattering angle of a photon, while the third hit ensures the precise labeling of the 511 keV photons.
    Results: By comparing experimental and simulated energy distribution spectra, the registration efficiency of the J-PET scanner was determined in the energy deposition range of 70-270 keV, where it varies between 20 and 100[Formula: see text]. In addition, the intrinsic efficiency of the J-PET was also determined as a function of the energy of the incident photons.
    Conclusion: A method for determining registration efficiency as a function of energy deposition and intrinsic efficiency as a function of incident photon energy of the J-PET scanner was demonstrated. This study is crucial for evaluating the performance of the scanner based on plastic scintillators and its applications as a standard and multi-photon PET systems. The method may be also used in the calibration of Compton-cameras developed for the ion-beam therapy monitoring and simultaneous multi-radionuclide imaging in nuclear medicine.
    Sprache Englisch
    Erscheinungsdatum 2023-04-08
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 2768912-8
    ISSN 2197-7364
    ISSN 2197-7364
    DOI 10.1186/s40658-023-00546-7
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  3. Artikel: Comparative studies of the sensitivities of sparse and full geometries of Total-Body PET scanners built from crystals and plastic scintillators.

    Dadgar, M / Parzych, S / Baran, J / Chug, N / Curceanu, C / Czerwiński, E / Dulski, K / Elyan, K / Gajos, A / Hiesmayr, B C / Kapłon, Ł / Klimaszewski, K / Konieczka, P / Korcyl, G / Kozik, T / Krzemien, W / Kumar, D / Niedzwiecki, S / Panek, D /
    Perez Del Rio, E / Raczyński, L / Sharma, S / Shivani, S / Shopa, R Y / Skurzok, M / Stepień, E Ł / Tayefi Ardebili, F / Tayefi Ardebili, K / Vandenberghe, S / Wiślicki, W / Moskal, P

    EJNMMI physics

    2023  Band 10, Heft 1, Seite(n) 62

    Abstract: Background: Alongside the benefits of Total-Body imaging modalities, such as higher sensitivity, single-bed position, low dose imaging, etc., their final construction cost prevents worldwide utilization. The main aim of this study is to present a ... ...

    Abstract Background: Alongside the benefits of Total-Body imaging modalities, such as higher sensitivity, single-bed position, low dose imaging, etc., their final construction cost prevents worldwide utilization. The main aim of this study is to present a simulation-based comparison of the sensitivities of existing and currently developed tomographs to introduce a cost-efficient solution for constructing a Total-Body PET scanner based on plastic scintillators.
    Methods: For the case of this study, eight tomographs based on the uEXPLORER configuration with different scintillator materials (BGO, LYSO), axial field-of-view (97.4 cm and 194.8 cm), and detector configurations (full and sparse) were simulated. In addition, 8 J-PET scanners with different configurations, such as various axial field-of-view (200 cm and 250 cm), different cross sections of plastic scintillator, and multiple numbers of plastic scintillator layers (2, 3, and 4), based on J-PET technology have been simulated by GATE software. Furthermore, Siemens' Biograph Vision has been simulated to compare the results with standard PET scans. Two types of simulations have been performed. The first one with a centrally located source with a diameter of 1 mm and a length of 250 cm, and the second one with the same source inside a water-filled cylindrical phantom with a diameter of 20 cm and a length of 183 cm.
    Results: With regards to sensitivity, among all the proposed scanners, the ones constructed with BGO crystals give the best performance ([Formula: see text] 350 cps/kBq at the center). The utilization of sparse geometry or LYSO crystals significantly lowers the achievable sensitivity of such systems. The J-PET design gives a similar sensitivity to the sparse LYSO crystal-based detectors while having full detector coverage over the body. Moreover, it provides uniform sensitivity over the body with additional gain on its sides and provides the possibility for high-quality brain imaging.
    Conclusion: Taking into account not only the sensitivity but also the price of Total-Body PET tomographs, which till now was one of the main obstacles in their widespread clinical availability, the J-PET tomography system based on plastic scintillators could be a cost-efficient alternative for Total-Body PET scanners.
    Sprache Englisch
    Erscheinungsdatum 2023-10-11
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 2768912-8
    ISSN 2197-7364
    ISSN 2197-7364
    DOI 10.1186/s40658-023-00572-5
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  4. Artikel ; Online: Optimisation of the event-based TOF filtered back-projection for online imaging in total-body J-PET.

    Shopa, R Y / Klimaszewski, K / Kopka, P / Kowalski, P / Krzemień, W / Raczyński, L / Wiślicki, W / Chug, N / Curceanu, C / Czerwiński, E / Dadgar, M / Dulski, K / Gajos, A / Hiesmayr, B C / Kacprzak, K / Kapłon, Ł / Kisielewska, D / Korcyl, G / Krawczyk, N /
    Kubicz, E / Niedźwiecki, Sz / Raj, J / Sharma, S / Shivani / Stȩpień, E Ł / Tayefi, F / Moskal, P

    Medical image analysis

    2021  Band 73, Seite(n) 102199

    Abstract: We perform a parametric study of the newly developed time-of-flight (TOF) image reconstruction algorithm, proposed for the real-time imaging in total-body Jagiellonian PET (J-PET) scanners. The asymmetric 3D filtering kernel is applied at each most ... ...

    Abstract We perform a parametric study of the newly developed time-of-flight (TOF) image reconstruction algorithm, proposed for the real-time imaging in total-body Jagiellonian PET (J-PET) scanners. The asymmetric 3D filtering kernel is applied at each most likely position of electron-positron annihilation, estimated from the emissions of back-to-back γ-photons. The optimisation of its parameters is studied using Monte Carlo simulations of a 1-mm spherical source, NEMA IEC and XCAT phantoms inside the ideal J-PET scanner. The combination of high-pass filters which included the TOF filtered back-projection (FBP), resulted in spatial resolution, 1.5 times higher in the axial direction than for the conventional 3D FBP. For realistic 10-minute scans of NEMA IEC and XCAT, which require a trade-off between the noise and spatial resolution, the need for Gaussian TOF kernel components, coupled with median post-filtering, is demonstrated. The best sets of 3D filter parameters were obtained by the Nelder-Mead minimisation of the mean squared error between the resulting and reference images. The approach allows training the reconstruction algorithm for custom scans, using the IEC phantom, when the temporal resolution is below 50 ps. The image quality parameters, estimated for the best outcomes, were systematically better than for the non-TOF FBP.
    Mesh-Begriff(e) Algorithms ; Humans ; Image Processing, Computer-Assisted ; Monte Carlo Method ; Phantoms, Imaging ; Positron-Emission Tomography
    Sprache Englisch
    Erscheinungsdatum 2021-07-24
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1356436-5
    ISSN 1361-8423 ; 1361-8431 ; 1361-8415
    ISSN (online) 1361-8423 ; 1361-8431
    ISSN 1361-8415
    DOI 10.1016/j.media.2021.102199
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  5. Buch ; Online: J-PET detection modules based on plastic scintillators for performing studies with positron and positronium beams

    Sharma, S. / Baran, J. / Brusa, R. S. / Caravita, R. / Chug, N. / Coussat, A. / Curceanu, C. / Czerwinski, E. / Dadgar, M. / Dulski, K. / Eliyan, K. / Gajos, A. / Hiesmayr, B. C. / Kacprzak, K. / Kaplon, L. / Klimaszewski, K. / Konieczka, P. / Korcyl, G. / Kozik, T. /
    Krzemien, W. / Kumar, D. / Mariazzi, S. / Niedzwiecki, S. / Panasa, L. / Parzych, S. / Povolo, L. / del Rio, E. Perez / Raczynski, L. / Shivani / Shopa, R. Y. / Skurzok, M. / Stepien, E. L. / Tayefi, F. / Tayefi, K. / Wislicki, W. / Moskal, P.

    2023  

    Abstract: The J-PET detector, which consists of inexpensive plastic scintillators, has demonstrated its potential in the study of fundamental physics. In recent years, a prototype with 192 plastic scintillators arranged in 3 layers has been optimized for the study ...

    Abstract The J-PET detector, which consists of inexpensive plastic scintillators, has demonstrated its potential in the study of fundamental physics. In recent years, a prototype with 192 plastic scintillators arranged in 3 layers has been optimized for the study of positronium decays. This allows performing precision tests of discrete symmetries (C, P, T) in the decays of positronium atoms. Moreover, thanks to the possibility of measuring the polarization direction of the photon based on Compton scattering, the predicted entanglement between the linear polarization of annihilation photons in positronium decays can also be studied. Recently, a new J-PET prototype was commissioned, based on a modular design of detection units. Each module consists of 13 plastic scintillators and can be used as a stand-alone, compact and portable detection unit. In this paper, the main features of the J-PET detector, the modular prototype and their applications for possible studies with positron and positronium beams are discussed. Preliminary results of the first test experiment performed on two detection units in the continuous positron beam recently developed at the Antimatter Laboratory (AML) of Trento are also reported.
    Schlagwörter Physics - Instrumentation and Detectors
    Thema/Rubrik (Code) 621
    Erscheinungsdatum 2023-01-07
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  6. Buch ; Online: Mesoscopic approach to minority games in herd regime

    Wawrzyniak, Karol / Wislicki, Wojciech

    2011  

    Abstract: We study minority games in efficient regime. By incorporating the utility function and aggregating agents with similar strategies we develop an effective mesoscale notion of state of the game. Using this approach, the game can be represented as a Markov ... ...

    Abstract We study minority games in efficient regime. By incorporating the utility function and aggregating agents with similar strategies we develop an effective mesoscale notion of state of the game. Using this approach, the game can be represented as a Markov process with substantially reduced number of states with explicitly computable probabilities. For any payoff, the finiteness of the number of states is proved. Interesting features of an extensive random variable, called aggregated demand, viz. its strong inhomogeneity and presence of patterns in time, can be easily interpreted. Using Markov theory and quenched disorder approach, we can explain important macroscopic characteristics of the game: behavior of variance per capita and predictability of the aggregated demand. We prove that in case of linear payoff many attractors in the state space are possible.

    Comment: arXiv admin note: substantial text overlap with arXiv:0907.3231
    Schlagwörter Nonlinear Sciences - Adaptation and Self-Organizing Systems ; Computer Science - Multiagent Systems ; Mathematics - Dynamical Systems ; Quantitative Finance - Trading and Market Microstructure ; Statistics - Applications
    Erscheinungsdatum 2011-11-29
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  7. Artikel ; Online: Testing CPT symmetry in ortho-positronium decays with positronium annihilation tomography.

    Moskal, P / Gajos, A / Mohammed, M / Chhokar, J / Chug, N / Curceanu, C / Czerwiński, E / Dadgar, M / Dulski, K / Gorgol, M / Goworek, J / Hiesmayr, B C / Jasińska, B / Kacprzak, K / Kapłon, Ł / Karimi, H / Kisielewska, D / Klimaszewski, K / Korcyl, G /
    Kowalski, P / Krawczyk, N / Krzemień, W / Kozik, T / Kubicz, E / Niedźwiecki, S / Parzych, S / Pawlik-Niedźwiecka, M / Raczyński, L / Raj, J / Sharma, S / Choudhary, S / Shopa, R Y / Sienkiewicz, A / Silarski, M / Skurzok, M / Stępień, E Ł / Tayefi, F / Wiślicki, W

    Nature communications

    2021  Band 12, Heft 1, Seite(n) 5658

    Abstract: Charged lepton system symmetry under combined charge, parity, and time-reversal transformation (CPT) remains scarcely tested. Despite stringent quantum-electrodynamic limits, discrepancies in predictions for the electron-positron bound state (positronium ...

    Abstract Charged lepton system symmetry under combined charge, parity, and time-reversal transformation (CPT) remains scarcely tested. Despite stringent quantum-electrodynamic limits, discrepancies in predictions for the electron-positron bound state (positronium atom) motivate further investigation, including fundamental symmetry tests. While CPT noninvariance effects could be manifested in non-vanishing angular correlations between final-state photons and spin of annihilating positronium, measurements were previously limited by knowledge of the latter. Here, we demonstrate tomographic reconstruction techniques applied to three-photon annihilations of ortho-positronium atoms to estimate their spin polarisation without magnetic field or polarised positronium source. We use a plastic-scintillator-based positron-emission-tomography scanner to record ortho-positronium (o-Ps) annihilations with single-event estimation of o-Ps spin and determine the complete spectrum of an angular correlation operator sensitive to CPT-violating effects. We find no violation at the precision level of 10
    Sprache Englisch
    Erscheinungsdatum 2021-09-27
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-021-25905-9
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  8. Artikel ; Online: Simulating NEMA characteristics of the modular total-body J-PET scanner-an economic total-body PET from plastic scintillators.

    Moskal, P / Kowalski, P / Shopa, R Y / Raczyński, L / Baran, J / Chug, N / Curceanu, C / Czerwiński, E / Dadgar, M / Dulski, K / Gajos, A / Hiesmayr, B C / Kacprzak, K / Kapłon, Ł / Kisielewska, D / Klimaszewski, K / Kopka, P / Korcyl, G / Krawczyk, N /
    Krzemień, W / Kubicz, E / Niedźwiecki, Sz / Parzych, Sz / Raj, J / Sharma, S / Shivani, S / Stępień, E / Tayefi, F / Wiślicki, W

    Physics in medicine and biology

    2021  Band 66, Heft 17

    Abstract: The purpose of the presented research is estimation of the performance characteristics of the economic total-body Jagiellonian-PET system (TB-J-PET) constructed from plastic scintillators. The characteristics are estimated according to the NEMA NU-2-2018 ...

    Abstract The purpose of the presented research is estimation of the performance characteristics of the economic total-body Jagiellonian-PET system (TB-J-PET) constructed from plastic scintillators. The characteristics are estimated according to the NEMA NU-2-2018 standards utilizing the GATE package. The simulated detector consists of 24 modules, each built out of 32 plastic scintillator strips (each with cross section of 6 mm times 30 mm and length of 140 or 200 cm) arranged in two layers in regular 24-sided polygon circumscribing a circle with the diameter of 78.6 cm. For the TB-J-PET with an axial field-of-view (AFOV) of 200 cm, a spatial resolutions (SRs) of 3.7 mm (transversal) and 4.9 mm (axial) are achieved. The noise equivalent count rate (NECR) peak of 630 kcps is expected at 30 kBq cc
    Mesh-Begriff(e) Phantoms, Imaging ; Plastics ; Positron-Emission Tomography ; Tomography, X-Ray Computed
    Chemische Substanzen Plastics
    Sprache Englisch
    Erscheinungsdatum 2021-09-01
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208857-5
    ISSN 1361-6560 ; 0031-9155
    ISSN (online) 1361-6560
    ISSN 0031-9155
    DOI 10.1088/1361-6560/ac16bd
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  9. Artikel ; Online: Transformation of PET raw data into images for event classification using convolutional neural networks.

    Konieczka, Paweł / Raczyński, Lech / Wiślicki, Wojciech / Fedoruk, Oleksandr / Klimaszewski, Konrad / Kopka, Przemysław / Krzemień, Wojciech / Shopa, Roman Y / Baran, Jakub / Coussat, Aurélien / Chug, Neha / Curceanu, Catalina / Czerwiński, Eryk / Dadgar, Meysam / Dulski, Kamil / Gajos, Aleksander / Hiesmayr, Beatrix C / Kacprzak, Krzysztof / Kapłon, Łukasz /
    Korcyl, Grzegorz / Kozik, Tomasz / Kumar, Deepak / Niedźwiecki, Szymon / Parzych, Szymon / Río, Elena Pérez Del / Sharma, Sushil / Shivani, Shivani / Skurzok, Magdalena / Stępień, Ewa Łucja / Tayefi, Faranak / Moskal, Paweł

    Mathematical biosciences and engineering : MBE

    2023  Band 20, Heft 8, Seite(n) 14938–14958

    Abstract: In positron emission tomography (PET) studies, convolutional neural networks (CNNs) may be applied directly to the reconstructed distribution of radioactive tracers injected into the patient's body, as a pattern recognition tool. Nonetheless, unprocessed ...

    Abstract In positron emission tomography (PET) studies, convolutional neural networks (CNNs) may be applied directly to the reconstructed distribution of radioactive tracers injected into the patient's body, as a pattern recognition tool. Nonetheless, unprocessed PET coincidence data exist in tabular format. This paper develops the transformation of tabular data into n-dimensional matrices, as a preparation stage for classification based on CNNs. This method explicitly introduces a nonlinear transformation at the feature engineering stage and then uses principal component analysis to create the images. We apply the proposed methodology to the classification of simulated PET coincidence events originating from NEMA IEC and anthropomorphic XCAT phantom. Comparative studies of neural network architectures, including multilayer perceptron and convolutional networks, were conducted. The developed method increased the initial number of features from 6 to 209 and gave the best precision results (79.8) for all tested neural network architectures; it also showed the smallest decrease when changing the test data to another phantom.
    Sprache Englisch
    Erscheinungsdatum 2023-09-07
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 2265126-3
    ISSN 1551-0018 ; 1551-0018
    ISSN (online) 1551-0018
    ISSN 1551-0018
    DOI 10.3934/mbe.2023669
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  10. Artikel ; Online: Discrete symmetries tested at 10

    Moskal, Paweł / Czerwiński, Eryk / Raj, Juhi / Bass, Steven D / Beyene, Ermias Y / Chug, Neha / Coussat, Aurélien / Curceanu, Catalina / Dadgar, Meysam / Das, Manish / Dulski, Kamil / Gajos, Aleksander / Gorgol, Marek / Hiesmayr, Beatrix C / Jasińska, Bożena / Kacprzak, Krzysztof / Kaplanoglu, Tevfik / Kapłon, Łukasz / Klimaszewski, Konrad /
    Konieczka, Paweł / Korcyl, Grzegorz / Kozik, Tomasz / Krzemień, Wojciech / Kumar, Deepak / Moyo, Simbarashe / Mryka, Wiktor / Niedźwiecki, Szymon / Parzych, Szymon / Del Río, Elena Pérez / Raczyński, Lech / Sharma, Sushil / Choudhary, Shivani / Shopa, Roman Y / Silarski, Michał / Skurzok, Magdalena / Stępień, Ewa Ł / Tanty, Pooja / Ardebili, Faranak Tayefi / Ardebili, Keyvan Tayefi / Eliyan, Kavya Valsan / Wiślicki, Wojciech

    Nature communications

    2024  Band 15, Heft 1, Seite(n) 78

    Abstract: Discrete symmetries play an important role in particle physics with violation of CP connected to the matter-antimatter imbalance in the Universe. We report the most precise test of P, T and CP invariance in decays of ortho-positronium, performed with ... ...

    Abstract Discrete symmetries play an important role in particle physics with violation of CP connected to the matter-antimatter imbalance in the Universe. We report the most precise test of P, T and CP invariance in decays of ortho-positronium, performed with methodology involving polarization of photons from these decays. Positronium, the simplest bound state of an electron and positron, is of recent interest with discrepancies reported between measured hyperfine energy structure and theory at the level of 10
    Sprache Englisch
    Erscheinungsdatum 2024-01-02
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-44340-6
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