Autor: Lisowski, Edward - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Quality improvement of a gear transmission by means of genetic algorithm
Autorzy:: Lempa, Paweł
Lisowski, Edward
Masui, Fumito
Filo, Grzegorz
Ptaszynski, Michal
Domagała, Mariusz
Fabiś-Domagała, Joanna
Tematy:: optimization
genetic algorithm
gear transmission
optymalizacja
algorytm genetyczny
przekładnia zębata; Pokaż więcej
Wydawca:: Stowarzyszenie Menedżerów Jakości i Produkcji
Powiązania:: https://bibliotekanauki.pl/articles/104043.pdf Link otwiera się w nowym oknie
Opis:: The article deals with the issue of quality improvement of a gear transmission by optimizing its geometry with the use of genetic algorithms. The optimization method is focused on increasing productivity and efficiency of the pump and reducing its pulsation. The best results are tested on mathematical model and automatically modelled in 3D be means of PTC Creo Software. The developed solution proved to be an effective tool in the search for better results, which greatly improved parameters of pump especially reduced flow pulsation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Nonmaximal entanglement of photons from positron-electron annihilation demonstrated using a plastic PET scanner
Autorzy:: Curceanu, Catalina
Chug, Neha
Kapłon, Łukasz
Niedźwiecki, Szymon
Coussat, Aurélien
Czerwiński, Eryk
Gorgol, Marek
Skurzok, Magdalena
Tayefi Ardebili, Keyvan
Mryka, Wiktor
Kumar, Deepak
Beyene, Ermias Yitayew
Kacprzak, Krzysztof
Dulski, Kamil
Lisowski, Filip
Tanty, Pooja
Stępień, Ewa
Lisowski, Edward
Jasińska, Bożena
Das, Manish
Valsan Eliyan, Kavya
Parzych, Szymon
Sharma, Sushil
Kaplanoglu, Muhammed
Rädler, Martin
Moskal, Paweł
Kozik, Tomasz
Perez del Rio, Elena
Opis:: In state-of-the-art positron emission tomography (PET), information about annihilation photon polarization is unavailable. Here, we present a PET scanner built from plastic scintillators, where annihilation photons primarily interact via the Compton effect, providing information about both photon polarization and propagation direction. Using this plastic-based PET, we determined the distribution of the relative angle between polarization planes of photons from positron-electron annihilation in a porous polymer. The amplitude of the observed distribution is smaller than predicted for maximally quantum entangled two-photon states but larger than expected for separable photons. This result can be well explained by assuming that photons from pick-off annihilation are not entangled, while photons from direct and parapositronium annihilations are maximally entangled. Our result indicates that the degree of entanglement depends on the annihilation mechanism in matter, opening avenues for exploring polarization correlations in PET as a diagnostic indicator.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 3.

Tytuł:: Quality control of plastic scintillators for the total-body J-PET scanner
Autorzy:: Chug, Neha
Kapłon, Łukasz
Mędrala-Sowa, Justyna
Niedźwiecki, Szymon
Czerwiński, Eryk
Skurzok, Magdalena
Tayefi Ardebili, Keyvan
Mryka, Wiktor
Kumar, Deepak
Moskal, Gabriel
Kacprzak, Krzysztof
Korcyl, Grzegorz
Kubat, Karol
Pandey, Piyush
Beyene, Ermias
Lisowski, Filip
Tanty, Pooja
Stępień, Ewa
Curceanu, C.
Lisowski, Edward
Kunimmal Venadan, Anoop
Kaplanoglu, T.
Das, Manish
Valsan Eliyan, Kavya
Parzych, Szymon
Sharma, Sushil
Moskal, Paweł
Perez del Rio, Elena
Opis:: The construction of the total-body Jagiellonian positron emission tomography scanner requires component verification before detector assembly. The purpose of this research is to verify the quality of BC-408 plastic scintillators with dimensions 6 mm × 30 mm × 330 mm. The scintillators were inspected for optical and mechanical defects and all dimensions were measured. Scratches, mechanically damaged corners and edges, as well as encapsulated dust and fibers within the scintillators, were identified under ceiling lamp illumination. Line defects on the as-cast surfaces were easily visible in a plane polariscope setup consisting of crossed horizontal and vertical polarizer foils. The transmittance at the wavelength of maximum emission through 6 mm thick scintillator samples and the technical attenuation length along 330 mm long scintillator samples were measured on a linear CCD array spectrometer for randomly selected scintillators from each delivered batch. Selected properties of the emission spectra, such as their FWHM and the values of the emission maxima as a function of the distance between the excitation point and the spectrometer fiber, were measured. Additionally, the scintillators optical homogeneity was measured on a light transfer setup consisting of an LED and photodiode matrix. The majority of the obtained plastic scintillators meets the transparency criteria and falls within the dimensional tolerances.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 4.

Tytuł:: Development of correction techniques for the J-PET Scanner
Autorzy:: Curceanu, Catalina
Khreptak, Aleksander
Niedźwiecki, Szymon
Chug, Neha
Mędrala-Sowa, Justyna
Sowa-Staszczak, Anna
Badawi, Ramsey
Czerwiński, Eryk
Skurzok, Magdalena
Głowa, Bogusław
Spencer, Benjamin A.
Tayefi Ardebili, Keyvan
Mryka, Wiktor
Kumar, Deepak
Beyene, Ermias Yitayew
Kacprzak, Krzysztof
Korcyl, Grzegorz
Kubat, Karol
Pandey, Piyush
Lisowski, Filip
Tanty, Pooja
Opalińska, Marta
Bayerlein, Reimund
Stępień, Ewa
Lisowski, Edward
Kunimmal Venadan, Anoop
Das, Manish
Valsan Eliyan, Kavya
Parzych, Szymon
Sharma, Sushil
Hubalewska-Dydejczyk, Alicja
Kaplanoglu, Muhammed
Moyo, Simbarashe
Kasperska, Kamila
Moskal, Paweł
Rädler, Martin
Opis:: Objective: Positron emission tomography (PET) is a widely used medical imaging technique that allows for non-invasive imaging of metabolic processes. However, traditional PET scanners rely on costly inorganic scintillators that limit their accessibility, especially in light of emerging long axial field-of-view devices. The modular J-PET scanner, an innovative alternative, uses 50-cm-long plastic scintillator strips, offering a cost-effective and modular solution. In this study we develop and assess the PET data correction techniques required for quantitative image reconstruction. Methods: We present methods for attenuation correction, random coincidence correction using the delayed time window (DTW) technique and scatter correction based on Monte Carlo simulations. Phantom studies using the NEMA IQ phantom were performed to qualitatively evaluate these corrections. Results: The results demonstrate that our implemented corrections for attenuation and random and scattered coincidences successfully improve the uniformity of tracer distribution in homogenous volumes and significantly reduce undesired activity in cold regions. Despite limitations in sensitivity and axial resolution, the applied correction techniques effectively enhance image quality, providing promising results for future applications. Conclusions: These findings highlight the potential of the modular J-PET system to offer affordable PET imaging and to pave the way for a total-body PET scanner based on plastic scintillators. Future work will focus on quantitative validation and the implementation of these corrections for human subject imaging.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 5.

Tytuł:: μPPET : investigating the Muon Puzzle with J-PET detectors
Autorzy:: Moyo, Simbarashe
Moskal, Paweł
Curceanu, Catalina
Moskal, Gabriel
Rädler, Martin
Parzych, Szymon
Czerwiński, Eryk
Perez del Rio, Elena
Kubat, Karol
Tiwari, Satyam
Lisowski, Filip
Hajduga, Jakub
Niedźwiecki, Szymon
Rachwał, Bartłomiej
Pandey, Piyush
Tanty, Pooja
Kapłon, Łukasz
Korcyl, Grzegorz
Khreptak, Aleksander
Kaplanoglu, Muhammed Tevfik
Porcelli, Alessio
Jalali, Sharareh
Protiti, Nousaba Nasrin
Skurzok, Magdalena
Kumar, Deepak
Szumlak, Tomasz
Kozik, Tomasz
Kacprzak, Krzysztof
Tayefi Ardebili, Keyvan
Sharma, Sushil
Beyene, Ermias Yitayew
Sirghi, Diana Laura
Das, Manish
Stępień, Ewa
Lisowski, Edward
Gorgol, Marek
Kasperska, Kamila
Mędrala-Sowa, Justyna
Jasińska, Bożena
Chug, Neha
Mryka, Wiktor
Valsan Eliyan, Kavya
Opis:: The μPPET [mu(μ)on Probe with J-PET] project aims to investigate the “Muon Puzzle” seen in cosmic ray air showers. This puzzle arises from the observation of a significantly larger number of muons on Earth’s surface than that predicted by the current theoretical models. The investigated hypothesis is based on recently observed asymmetries in the parameters for the strong interaction cross-section and trajectory of an outgoing particle due to projectile–target polarization. The measurements require detailed information about muons at the ground level, including their track and charge distributions. To achieve this, the two PET scanners developed at the Jagiellonian University in Krakow (Poland), the J-PET detectors, will be employed, taking advantage of their well-known resolution and convenient location for detecting muons that reach long depths in the atmosphere. One station will be used as a muon tracker, while the second will reconstruct the core of the air shower. In parallel, the existing hadronic interaction models will be modified and fine-tuned based on the experimental results. In this work, we present the conceptualization and preliminary designs of μPPET.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 6.

Tytuł:: First positronium imaging using $^{44}$Sc with the J-PET scanner : a case study on the NEMA-Image Quality phantom
Autorzy:: Khreptak, Aleksander
Bilewicz, Aleksander
Lisowski, Filip
Tiwari, Satyam
Czerwiński, Eryk
Stępień, Ewa
Curceanu, Catalina
Chug, Neha
Korcyl, Grzegorz
Valsan Eliyan, Kavya
Rädler, Martin
Beyene, Ermias Yitayew
Mryka, Wiktor
Pandey, Piyush
Kunimmal Venadan, Anoop
Mędrala-Sowa, Justyna
Stolarz, Anna
Kumar, Deepak
Rominger, Axel
Niedźwiecki, Szymon
Lisowski, Edward
Walczak, Rafal
Tanty, Pooja
Szumlak, Tomasz
Sharma, Sushil
Kubat, Karol
Moskal, Paweł
Kapłon, Łukasz
Kacprzak, Krzysztof
Choinski, Jaroslaw
Skurzok, Magdalena
Perez del Rio, Elena
Shi, Kuangyu
Parzych, Szymon
Hajduga, Jakub
Kasperska, Kamila
Jalali, Sharareh
Rachwal, Bartlomiej
Porcelli, Alessio
Tayefi Ardebili, Keyvan
Das, Manish
Moyo, Simbarashe
Kaplanoglu, Muhammed Tevfik
Kozik, Tomasz
Opis:: Positronium Lifetime Imaging (PLI), an emerging extension of conventional positron emission tomography (PET) imaging, offers a novel window for probing the submolecular properties of biological tissues by imaging the mean lifetime of the positronium atom. Currently, the method is under rapid development in terms of reconstruction and detection systems. Recently, the first in vivo PLI of the human brain was performed using the J-PET scanner utilizing the 68Ga isotope. However, this isotope has limitations due to its comparatively low prompt gamma yields, which is crucial for positronium lifetime measurement. Among alternative radionuclides, 44Sc stands out as a promising isotope for PLI, characterized by a clinically suitable half-life (4.04 hours) emitting 1157 keV prompt gamma in 100% cases after the emission of the positron. This study reports the first experimental demonstration of PLI with 44Sc, carried out on a NEMA-Image Quality (IQ) phantom using the Modular J-PET tomograph–the first plastic scintillators-based PET scanner.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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