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Simulations of γ quanta scattering in a single module of the J-PET detector

Szymański K., Moskal P., Bednarski T., Białas P., Czerwiński E., Giergiel K., Kapłon Ł., Kochanowski A., Korcyl G., Kowal J., Kowalski P., Kozik T., Krzemień W., Molenda M., Moskal I., Niedźwiecki S., Pałka M., Pawlik-Niedźwiecka M., Raczyński L., Rudy Z., Salabura P., Gupta-Sharma N., Silarski M., Słomski A., Smyrski J., Strzelecki A., Witkowski P., Wiślicki W., Zieliński M., Zoń N.

Bio-Algorithms and Med-Systems

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2014

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Vol. 10, no. 2

71--77

EN

This article describes the simulations of the scattering of annihilation γ quanta in a strip of a plastic scintillator. Such strips constitute the basic detection modules in a newly proposed positron emission tomography (PET), which utilizes plastic scintillators instead of inorganic crystals. An algorithm simulating the chain of Compton scatterings was elaborated and a series of simulations have been conducted for the scintillator strip with a cross-section of 5×19 mm. The results indicate that secondary interactions occur only in the case of about 8% of the events and only 25% of these events take place in the distance larger than 0.5 cm from the primary interaction. Also, the light signals produced at the primary and secondary interactions overlap with the delay, the distribution of which is characterized by a full width at half-maximum (FWHM) of about 40 ps.

2

List-mode reconstruction in 2D strip PET

Białas P., Kowal J., Strzelecki A., Bednarski T., Czerwiński E., Giergiel K., Kapłon Ł., Kochanowski A., Korcyl G., Kowalski P., Kozik T., Krzemień W., Molenda M., Moskal I., Moskal P., Niedźwiecki S., Pałka M., Pawlik M., Raczyński L., Rudy Z., Salabura P., Gupta-Sharma N., Silarski M., Słomski A., Smyrski J., Szymański K., Wiślicki W., Witkowski P., Zieliński M., Zoń N.

Bio-Algorithms and Med-Systems

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2014

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Vol. 10, no. 1

9--12

EN

Using a theory of list-mode maximum likelihood expectation-maximization (MLEM) algorithm, in this contribution, we present a derivation of the system response kernel for a novel positron emission tomography (PET) detector based on plastic scintillators.

3

Determination of the map of efficiency of the Jagiellonian Positron Emission Tomograph (J-PET) detector with the GATE package

Kowalski P., Raczyński L., Bednarski T., Białas P., Czerwiński E., Giergiel K., Kapłon Ł., Kochanowski A., Korcyl G., Kowal J., Kozik T., Krzemień W., Molenda M., Moskal I., Moskal P., Niedźwiecki S., Pałka M., Pawlik-Niedźwiecka M., Rudy Z., Salabura P., Gupta-Sharma N., Silarski M., Słomski A., Smyrski J., Strzelecki A., Szymański K., Wiślicki W., Witkowski P., Zieliński M., Zoń N.

Bio-Algorithms and Med-Systems

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2014

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Vol. 10, no. 2

85--90

EN

A novel PET detector consisting of strips of polymer scintillators is being developed by the Jagiellonian Positron Emission Tomograph (J-PET) collaboration. The map of efficiency and the map of geometrical acceptance of the two-strip J-PET scanner are presented. The map of efficiency was determined using the Monte Carlo simulation software GEANT4 Application for Tomographic Emission (GATE), which is based on GEANT4. Both maps were compared using a method based on the χ2-test.

4

Calibration of photomultipliers gain used in the J-PET detector

Bednarski T., Czerwiński E., Moskal P., Białas P., Giergiel K., Kapłon Ł., Kochanowski A., Korcyl G., Kowal J., Kowalski P., Kozik T., Krzemień W., Molenda M., Moskal I., Niedźwiecki S., Pałka M., Pawlik M., Raczyński L., Rudy Z., Salabura P., Gupta-Sharma N., Silarski M., Słomski A., Smyrski J., Strzelecki A., Szymański K. J., Wiślicki W., Witkowski P., Zieliński M., Zoń N.

Bio-Algorithms and Med-Systems

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2014

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Vol. 10, no. 1

13--17

EN

Photomultipliers are commonly used in commercial PET scanner as devices that convert light produced in scintillator by gamma quanta from positron-electron annihilation into electrical signal. For proper analysis of obtained electrical signal, a photomultiplier gain curve must be known, since gain can be significantly different even between photomultipliers of the same model. In this article, we describe single photoelectron method used for photomultiplier calibration applied for J-PET scanner, a novel PET detector being developed at Jagiellonian University. A description of calibration method, an example of calibration curve, and a gain of few Hamamatsu R4998 photomultipliers are presented.