In small animal and organ dedicated PET scanners, the knowledge of depth of interaction (DOI) of the gamma ray along the main axis of the scintillator is a fundamental information in order to avoid parallax error and to achieve high performances in terms of spatial resolution. Recently we developed a new method to obtain the DOI function for a single side readout PET module, recirculating the scintillation light in the matrix by means of a mirror placed on top of the module. In a complete PET scanner, periodical DOI calibrations have to be performed to prevent time dependent miscalibrations and performance degradations. The current DOI calibration relies on a coincidence system between the module and an external scintillator to provide a priori the DOI information and it is clearly not feasible in a real system without unpractical disassemblies of the scanner. In this paper we develop instead a fast and precise calibration method based on uniform irradiation of the scintillators. Three irradiation modalities are presented, in particular one where the source is placed on top of the module, one with the source placed on one side of the module and one that exploits the internal radioactivity of the scintillator. The three different procedures are evaluated and the calibration method is validated by comparing the information provided by the coincidence setup.

Stringhini, G., Pizzichemi, M., Ghezzi, A., Stojkovic, A., Paganoni, M., Auffray, E. (2016). Development and evaluation of a practical method to measure the Depth of Interaction function for a single side readout PET detector. JOURNAL OF INSTRUMENTATION, 11(11) [10.1088/1748-0221/11/11/P11014].

Development and evaluation of a practical method to measure the Depth of Interaction function for a single side readout PET detector

STRINGHINI, GIANLUCA
Primo
;
PIZZICHEMI, MARCO
Secondo
;
GHEZZI, ALESSIO;PAGANONI, MARCO
Penultimo
;
2016

Abstract

In small animal and organ dedicated PET scanners, the knowledge of depth of interaction (DOI) of the gamma ray along the main axis of the scintillator is a fundamental information in order to avoid parallax error and to achieve high performances in terms of spatial resolution. Recently we developed a new method to obtain the DOI function for a single side readout PET module, recirculating the scintillation light in the matrix by means of a mirror placed on top of the module. In a complete PET scanner, periodical DOI calibrations have to be performed to prevent time dependent miscalibrations and performance degradations. The current DOI calibration relies on a coincidence system between the module and an external scintillator to provide a priori the DOI information and it is clearly not feasible in a real system without unpractical disassemblies of the scanner. In this paper we develop instead a fast and precise calibration method based on uniform irradiation of the scintillators. Three irradiation modalities are presented, in particular one where the source is placed on top of the module, one with the source placed on one side of the module and one that exploits the internal radioactivity of the scintillator. The three different procedures are evaluated and the calibration method is validated by comparing the information provided by the coincidence setup.
Articolo in rivista - Articolo scientifico
Gamma camera, SPECT, PET PET/CT, coronary CT angiography (CTA); Gamma detectors (scintillators, CZT, HPG, HgI etc);
English
2016
11
11
P11014
none
Stringhini, G., Pizzichemi, M., Ghezzi, A., Stojkovic, A., Paganoni, M., Auffray, E. (2016). Development and evaluation of a practical method to measure the Depth of Interaction function for a single side readout PET detector. JOURNAL OF INSTRUMENTATION, 11(11) [10.1088/1748-0221/11/11/P11014].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/153096
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