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CERN Document Server 2,047 record trovati  1 - 10successivofine  salta al record: La ricerca ha impiegato 0.56 secondi. 
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Exploring Cherenkov emission of BGO for TOF-PET / Kratochwil, Nicolaus (CERN ; Vienna U.) ; Auffray, Etiennette (CERN) ; Gundacker, Stefan (CERN)
Bismuth germanate (BGO) was the preferred crystal for PET scanners, but was substituted with the emergence of faster crystals. Improvements in Silicon Photomultipliers (SiPMs) and the use of fast high frequency readout make it possible to use the prompt Cherenkov emission in BGO in order to boost the achievable coincidence time resolution significantly. The large fluctuations in the detected Cherenkov photon yield are causing time or amplitude walk effects in the leading edge time discrimination, which are corrected by measuring the initial signal rise time via a double threshold system. [...]
2021 - 12 p. - Published in : IEEE Trans. Rad. Plasma Med. Sci. 5 (2021) 619 Fulltext from publisher: PDF;
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High-frequency SiPM readout advances measured coincidence time resolution limits in TOF-PET / Gundacker, Stefan (Milan Bicocca U. ; CERN) ; Turtos, Rosana Martinez (CERN) ; Auffray, Etiennette (CERN) ; Paganoni, Marco (Milan Bicocca U.) ; Lecoq, Paul (CERN)
Scintillator based radiation detectors readout by SiPMs successively break records in their reached time resolution. Nevertheless, new challenges in time of flight positron emission tomography (TOF-PET) and high energy physics are setting unmatched goals in the 10 ps range. [...]
2019 - 10 p. - Published in : Physics in Medicine & Biology 64 (2019) 055012 Fulltext: PDF;
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Experimental time resolution limits of modern SiPMs and TOF-PET detectors exploring different scintillators and Cherenkov emission / Gundacker, Stefan (Milan Bicocca U. ; CERN) ; Martinez Turtos, Rosana (CERN) ; Kratochwil, Nicolaus (CERN ; Vienna U.) ; Pots, Rosalinde Hendrika (CERN ; RWTH Aachen U.) ; Paganoni, Marco (Milan Bicocca U. ; CERN) ; Lecoq, Paul (CERN) ; Auffray, Etiennette (CERN)
Solid state photodetectors like silicon photomultipliers (SiPMs) are playing an important role in several fields of medical imaging, life sciences and high energy physics. They are able to sense optical photons with a single photon detection time precision below 100 ps, making them ideal candidates to read the photons generated by fast scintillators in time of flight positron emission tomography (TOF-PET). [...]
2020 - 20 p. - Published in : Phys. Med. Biol. 65 (2020) 025001 Fulltext: PDF;
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Pushing Cherenkov PET with BGO via coincidence time resolution classification and correction / Kratochwil, Nicolaus (CERN ; Vienna U. ; [email protected]) ; Gundacker, Stefan (CERN ; Milan Bicocca U.) ; Lecoq, Paul (CERN) ; Auffray, Etiennette (CERN)
Bismuth germanate (BGO) shows good properties for positron emission tomography (PET) applications, but was substituted by the development of faster crystals like lutetium oxyorthosilicate (LSO) for time-of-flight PET (TOF-PET). Recent improvements in silicon photomultipliers (SiPMs) and fast readout electronics make it possible to access the Cherenkov photon signal produced upon 511 keV interaction, which makes BGO a cost-effective candidate for TOF-PET. [...]
2020 - 7 p. - Published in : Phys. Med. Biol. 65 (2020) 115004 Fulltext: PDF;
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A roadmap for sole Cherenkov radiators with SiPMs in TOF-PET / Kratochwil, Nicolaus (CERN ; TU Vienna) ; Gundacker, Stefan (CERN ; Aachen, Tech. Hochsch.) ; Auffray, Etiennette (CERN)
Time of flight positron emission tomography can strongly benefit from a very accurate time estimator given by Cherenkov radiation, which is produced upon a 511 keV positron–electron annihilation gamma interaction in heavy inorganic scintillators. While time resolution in the order of 30 ps full width at half maximum (FWHM) has been reported using MCP-PMTs and black painted Cherenkov radiators, such solutions have several disadvantages, like high cost and low detection efficiency of nowadays available MCP-PMTs. [...]
2021 - 23 p. - Published in : Phys. Med. Biol. 66 (2021) 195001 Fulltext: PDF;
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Systematic study of new types of Hamamatsu MPPCs read out with the NINO ASIC / Doroud, K (Enrico Fermi Ctr., Rome) ; Rodriguez, A (CERN ; World Lab., Geneva) ; Williams, M C S (CERN ; INFN, Bologna ; Bologna U.) ; Yamamoto, K (Hamamatsu Photonics) ; Zichichi, A (CERN ; Enrico Fermi Ctr., Rome ; INFN, Bologna ; Bologna U.) ; Zuyeuski, R (CERN ; World Lab., Geneva)
Over the last decade there have been commercial TOF-PET scanners constructed using Photo-Multiplier Tubes (PMT) that have achieved View the MathML source~500ps FWHM Coincidence Time Resolution (CTR). A new device known as the Silicon PhotoMultiplier (SiPM) has the potential to overcome some of the limitations of the PMT. [...]
2014 - 5 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 753 (2014) 149-153 Elsevier Open Access article: PDF;
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State of the art timing in TOF-PET detectors with LuAG, GAGG and L(Y)SO scintillators of various sizes coupled to FBK-SiPMs / Gundacker, S. (CERN) ; Acerbi, F. (Fond. Bruno Kessler, Trento) ; Auffray, E. (CERN) ; Ferri, A. (Fond. Bruno Kessler, Trento) ; Gola, A. (Fond. Bruno Kessler, Trento) ; Nemallapudi, M.V. (CERN) ; Paternoster, G. (Fond. Bruno Kessler, Trento) ; Piemonte, C. (Fond. Bruno Kessler, Trento) ; Lecoq, P. (CERN)
Time of flight (TOF) in positron emission tomography (PET) has experienced a revival of interest after its first introduction in the eighties. This is due to a significant progress in solid state photodetectors (SiPMs) and newly developed scintillators (LSO and its derivatives). [...]
2016 - Published in : JINST 11 (2016) P08008 IOP Open Access article: PDF;
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Performance evaluation of the FastIC readout ASIC with emphasis on Cherenkov emission in TOF-PET / Piller, Markus (CERN ; Graz U.) ; Castilla, Antonio M (Barcelona U.) ; Terragni, Giulia (CERN ; Vienna, Tech. U.) ; Alozy, Jerome (CERN) ; Auffray, Etiennette (CERN) ; Ballabriga, Rafael (CERN ; Barcelona U.) ; Campbell, Michael (CERN) ; Deutschmann, Bernd (Graz U.) ; Gascon, David (Barcelona U.) ; Gola, Alberto (Fond. Bruno Kessler, Trento) et al.
Objective. The efficient usage of prompt photons like Cherenkov emission is of great interest for the design of the next generation, cost-effective, and ultra-high-sensitivity time-of-flight positron emission tomography (TOF-PET) scanners. [...]
2024 - 13 p. - Published in : Phys. Med. Biol. 69 (2024) 115014 Fulltext: PDF;
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On light sharing TOF-PET modules with depth of interaction and 157 ps FWHM coincidence time resolution / Pizzichemi, M (CERN) ; Polesel, A (CERN ; Milan Bicocca U.) ; Stringhini, G (CERN ; Milan Bicocca U.) ; Gundacker, S (CERN ; Milan Bicocca U.) ; Lecoq, P (CERN) ; Tavernier, S (LIP, Lisbon ; Vrije U., Brussels) ; Paganoni, M (Milan Bicocca U.) ; Auffray, E (CERN)
The performance of a light sharing and recirculation mechanism that allows the extraction of depth of interaction (DOI) are investigated in this paper, with a particular focus on timing. In parallel, a method to optimize the coincidence time resolution (CTR) of PET detectors by use of the DOI information is proposed and tested. [...]
2019 - 17 p. - Published in : Phys. Med. Biol. 64 (2019) 155008 Fulltext from publisher: PDF;
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Time resolution deterioration with increasing crystal length in a TOF-PET system / Gundacker, S (CERN) ; Knapitsch, A (CERN) ; Auffray, E (CERN) ; Jarron, P (CERN) ; Meyer, T (CERN) ; Lecoq, P (CERN)
Highest time resolution in scintillator based detectors is becoming more and more important. In medical detector physics L(Y)SO scintillators are commonly used for time of flight positron emission tomography (TOF-PET). [...]
2014 - 9 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 737 (2014) 92-100 Elsevier Open Access article: PDF;
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