Scatter Fraction of the J-PET Tomography Scanner

Wiślicki, W.; Raczyński, L.; Alfs, D.; Bednarski, T.; Białas, P.; Czerwiński, E.; Gajos, A.; Głowacz, B.; Jasińska, J.; Kamińska, D.; Korcyl, G.; Kozik, T.; Krzemień, W.; Kubicz, E.; Mohammad, Mehdi Mir; Niedźwiecki, Sz.; Pałka, M.; Pawlik-Niedźwiecka, M.; Rudy, Z.; Silarski, M.; Smyrski, J.; Strzelecki, Adam; Wieczorek, A.; Zgardzińska, B.; Zieliński, Marcin; Moskal, P.

doi:10.5506/aphyspolb.47.549

Cited by 31 publications

(37 citation statements)

References 11 publications

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“…Sample data were produced using Monte Carlo simulation of the J-PET scanner with 384 strips arranged in one layer [24,25]. The J-PET detector was defined as a cylinder with inner radius 428 mm.…”

Section: Resultsmentioning

confidence: 99%

Introduction of Total Variation Regularization into Filtered Backprojection Algorithm

Raczyński¹,

Wiślicki²,

Klimaszewski³

et al. 2017

Acta Phys. Pol. B

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In this paper we extend the state-of-the-art filtered backprojection (FBP) method with application of the concept of Total Variation regularization. We compare the performance of the new algorithm with the most common form of regularizing in the FBP image reconstruction via apodizing functions. The methods are validated in terms of cross-correlation coefficient between reconstructed and real image of radioactive tracer distribution using standard Derenzo-type phantom. We demonstrate that the proposed approach results in higher cross-correlation values with respect to the standard FBP method.

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Section: Resultsmentioning

confidence: 99%

Introduction of Total Variation Regularization into Filtered Backprojection Algorithm

Raczyński¹,

Wiślicki²,

Klimaszewski³

et al. 2017

Acta Phys. Pol. B

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“…The second event selection criterion is based on the correlations between relative azimuthal angles of photon interactions recorded in the detector in cases of three interactions observed in close time coincidence. The tests performed with Monte Carlo simulations have shown that annihilations into two and three photons can be well separated using such correlations [60]. An exemplary relative distribution of values constructed using these correlations, obtained with the test measurement is presented in Figure 7a.…”

Section: Test Measurement With the J-pet Detectormentioning

confidence: 95%

“…• angular dependencies between relative azimuthal angles of recorded γ interaction points, specific to topology of the event [60]. Distributions of the TOT values, after equalization of responses of each detection module, are presented in Figure 6.…”

Section: Test Measurement With the J-pet Detectormentioning

confidence: 99%

Feasibility Study of the Time Reversal Symmetry Tests in Decay of Metastable Positronium Atoms with the J-PET Detector

Gajos

Curceanu

Czerwiński

et al. 2018

Advances in High Energy Physics

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This article reports on the feasibility of testing of the symmetry under reversal in time in a purely leptonic system constituted by positronium atoms using the J-PET detector. The present state of T symmetry tests is discussed with an emphasis on the scarcely explored sector of leptonic systems. Two possible strategies of searching for manifestations of T violation in non-vanishing angular correlations of final state observables in the decays of metastable triplet states of positronium available with J-PET are proposed and discussed. Results of a pilot measurement with J-PET and assessment of its performance in reconstruction of three-photon decays are shown along with an analysis of its impact on the sensitivity of the detector for the determination of T -violation sensitive observables.

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“…Results of the first tests of single and double module prototypes are described in references [16][17][18][19]. For further details about the data acquisition system and analysis, simulation of the detector response, as well as hittime and hit-position reconstruction methods the interested reader is referred to references [20][21][22][23][24][25][26]. Finally, the details about detector geometry along with its properties relevant for the registration of photons from the decays of ortho-positronium atoms are described in the recent article [27].…”

Section: Experimental Methodsmentioning

confidence: 99%

Studies of discrete symmetries in a purely leptonic system using the Jagiellonian Positron Emission Tomograph

et al. 2016

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Abstract. Discrete symmetries such as parity (P), charge-conjugation (C) and time reversal (T) are of fundamental importance in physics and cosmology. Breaking of charge conjugation symmetry (C) and its combination with parity (CP) constitute necessary conditions for the existence of the asymmetry between matter and antimatter in the observed Universe. The presently known sources of discrete symmetries violations can account for only a tiny fraction of the excess of matter over antimatter. So far CP and T symmetries violations were observed only for systems involving quarks and they were never reported for the purely leptonic objects. In this article we describe briefly an experimental proposal for the test of discrete symmetries in the decays of positronium atom which is made exclusively of leptons. The experiments are conducted by means of the Jagiellonian Positron Emission Tomograph (J-PET) which is constructed from strips of plastic scintillators enabling registration of photons from the positronium annihilation. J-PET tomograph together with the positronium target system enable to measure expectation values for the discrete symmetries odd operators constructed from (i) spin vector of the ortho-positronium atom, (ii) momentum vectors of photons originating from the decay of positronium, and (iii) linear polarization direction of annihilation photons. Linearly polarized positronium will be produced in the highly porous aerogel or polymer targets, exploiting longitudinally polarized positrons emitted by the sodium 22 Na isotope. Information about the polarization vector of orthopositronium will be available on the event by event basis and will be reconstructed from the known position of the positron source and the reconstructed position of the orthopositronium annihilation. In 2016 the first tests and calibration runs are planned, and the data collection with high statistics will commence in the year 2017.

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Scatter Fraction of the J-PET Tomography Scanner

Cited by 31 publications

References 11 publications

Introduction of Total Variation Regularization into Filtered Backprojection Algorithm

Introduction of Total Variation Regularization into Filtered Backprojection Algorithm

Feasibility Study of the Time Reversal Symmetry Tests in Decay of Metastable Positronium Atoms with the J-PET Detector

Studies of discrete symmetries in a purely leptonic system using the Jagiellonian Positron Emission Tomograph

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