Experimental characterization of the TOFPET2 ASIC

Bugalho, R.; Francesco, A. Di; Ferramacho, L.; Leong, C.; Niknejad, T.; Oliveira, Luís B.; Rolo, M.; Silva, J.C.; Silva, R.; Silveira, M.; Tavernier, S.; Varela, J.

doi:10.1088/1748-0221/14/03/p03029

Cited by 37 publications

(35 citation statements)

References 3 publications

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“…However, limitations imposed by commercially available electronics need to be traced and understood to characterize their origin and propose approaches to overcome them. A promising candidate for multi-channel readout is the TOFPET2 ASIC developed by PETsys Electronics S.A., a 64-channel integrated circuit which can process data rates of up to 600 kcps per individual channel, featuring a threethreshold trigger logic for dark count rejection [13]. The TOFPET2 ASIC consumes a maximum power of 8.2 mW per channel (including signal digitization) and has shown promising performance results in prior studies [14]- [16].…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Study on the Timing Limits of the TOFPET2 ASIC and on Approaches for Improvements

Nadig

Yusopova

Radermacher

et al. 2022

IEEE Trans. Radiat. Plasma Med. Sci.

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Novel electronic readout schemes of analog SiPMs have shown impressive timing performance of γ-detectors in positron emission tomography (PET). However, transfering these novel concepts to system level is key to exploit the improved coincidence time resolution (CTR) in (pre-)clinical imaging. In this study, the commercially available TOFPET2 ASIC from PETsys Electronics S.A. is tested in terms of the best achievable CTR. The measurable CTR limits will be obtained by state-of-the-art high-frequency (HF) readout, minimizing the impact of the electronic front-end on the time resolution. We achieved (73 ± 1) ps with the HF readout and (134 ± 10) ps with the TOFPET2 ASIC for a Ce-, and Cadoped lutetium-oxyorthosilcate (LYSO) crystal of 2×2×3 mm 3 size. We show that SiPM signal amplification and an effectively reduced TOFPET2 input stage impedance boost the CTR of a 20-mm high LYSO:Ce crystal to (187 ± 8) ps. Our studies also lead to the observation of side peaks in the coincidence time difference spectrum. This peaks are studied in depth and a conclusion on the ASIC for 100-ps PET applications is drawn.

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Section: Introductionmentioning

confidence: 99%

A Comprehensive Study on the Timing Limits of the TOFPET2 ASIC and on Approaches for Improvements

Nadig

Yusopova

Radermacher

et al. 2022

IEEE Trans. Radiat. Plasma Med. Sci.

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“…The leading edge CFD has been implemented in the 128 channels VFAT3 front-end ASIC [27]. The CT-TOT has been implemented in the 64-channel TOFPET2 ASIC [28,29]. We are presently designing an electronic circuit for the implementation of the CF-TOT method.…”

Section: Summary and Discussionmentioning

confidence: 99%

Evaluation of the Constant Fraction Time-Over-Threshold (CF-TOT) method for neutron-gamma pulse shape discrimination

Roy,

Vartsky,

Mor

et al. 2021

Preprint

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A: The use of Time-over-Threshold (TOT) for the discrimination between fast neutrons and gamma-rays is advantageous when large number of detection channels are required due to the simplicity of its implementation. However, the results obtained using TOT are usually inferior to those obtained using other pulse shape discrimination (PSD) methods. We present a novel approach for fast neutron/gamma-ray PSD using Constant-Fraction Time-over-Threshold (CF-TOT) pulse shape analysis. The method was evaluated using digitized waveforms from a liquid scintillator coupled to a photomultiplier tube as well as from a stilbene scintillator coupled to a photomultiplier tube and a silicon photomultiplier. The quality of neutron/gamma-ray discrimination was evaluated using Receiver Operator Characteristics curves and the results obtained with this approach were compared to the standard Constant Threshold Time-over-Threshold (CT-TOT) method. The novel CF-TOT PSD method results in >99.7% rejection of gamma-rays with ∼80% neutron acceptance, significantly better than CT-TOT.

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“…The data acquisition (DAQ) and processing system TOFPET2 produced by PETsys Electronics-Medical PET Detectors, S.A. (Oeiras, Portugal), was used [27,28]. The system consists of a central DAQ module, which can accompany up to 8 front-end boards (FEB), where two detector modules fit on one board.…”

Section: Sipm Control and Data Acquisition Systemmentioning

confidence: 99%

Investigation of GaGG:Ce with TOFPET2 ASIC Readout for Applications in Gamma Imaging Systems

et al. 2020

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We investigated two detector modules, each consisting of a 8 × 8 matrix of GaGG:Ce crystals with a crystal size of 3 × 3 × 20 mm3 and a 3.2 mm pitch. The light is collected by a 8 × 8 silicon photomultiplier array, with one silicon photomultiplier matching one crystal. The signals are read out and processed using the TOFPET2 ASIC. Performed laboratory tests of the detectors were performed using a 22Na source, where energy and coincidence time resolution with different optical coupling were examined between the crystals and silicon photomultipliers, as well as under various operating voltages. The mean energy resolution of 9.8±0.6% at 511 keV was observed and it was shown that the coincidence time resolution of 384±33 ps could be achieved. The results reassure that the GaGG scintillator is a very promising candidate for the development of imaging systems, in particular, ones utilizing Compton scattering where the energy resolution plays a critical role and a moderate timing performance is acceptable.

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Experimental characterization of the TOFPET2 ASIC

Cited by 37 publications

References 3 publications

A Comprehensive Study on the Timing Limits of the TOFPET2 ASIC and on Approaches for Improvements

A Comprehensive Study on the Timing Limits of the TOFPET2 ASIC and on Approaches for Improvements

Evaluation of the Constant Fraction Time-Over-Threshold (CF-TOT) method for neutron-gamma pulse shape discrimination

Investigation of GaGG:Ce with TOFPET2 ASIC Readout for Applications in Gamma Imaging Systems

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