F. Retière
A5103164647- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Advanced Optical Sensing Technologies
- Nuclear Physics and Applications
- CCD and CMOS Imaging Sensors
- High-Energy Particle Collisions Research
- Astrophysics and Cosmic Phenomena
- Advanced MRI Techniques and Applications
- Quantum Chromodynamics and Particle Interactions
- Advanced Semiconductor Detectors and Materials
- Radiation Therapy and Dosimetry
- Atmospheric Ozone and Climate
- Analytical Chemistry and Sensors
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Radiation Effects in Electronics
- Photocathodes and Microchannel Plates
- Advanced Radiotherapy Techniques
- Magnetic Field Sensors Techniques
TRIUMF
2016-2025
Institute of High Energy Physics
2020-2023
Chinese Academy of Sciences
2020-2023
University of Alberta
2023
University of Cagliari
2023
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2023
University of California, Riverside
2023
Princeton University
2023
Simon Fraser University
2021
University of British Columbia
2010-2013
A silicon photomultiplier (SiPM)-based positron emission tomography (PET) detector was developed using a resistor network charge division multiplexing circuit for readout. The consists of lutetium-yttrium oxy-orthosilicate (LYSO) scintillation crystal array, an SiPM array (SPMArray 4, SensL Inc., Cork, Ireland) and the implemented in through-hole package to facilitate changing values. For purposes optimizing readout circuit, LYSO used 4 with size mm on pitch 3.37 mm, matched pixel size....
We characterize a compact MR-compatible PET insert for simultaneous preclinical PET/MRI. Although specifically designed with the strict size constraint to fit inside 114-mm inner diameter of BGA-12S gradient coil used in BioSpec 70/20 and 94/20 series small-animal MRI systems, can easily be installed any appropriate scanner or as stand-alone system. <b>Methods:</b> The consists ring 16 detector-blocks each made from depth-of-interaction–capable dual-layer-offset arrays cerium-doped...
We present the initial results from a small animal PET insert designed to be operated inside 7T MRI. The fits within 114 mm inner diameter of Bruker BGA-12S gradient coil while accommodating 35 volume RF (outer 60 mm), both used in 70/20 MRI systems. is ring comprising 16 detectors. Each detector has dual-layer offset (DLO) lutetium-yttrium oxyorthsilicate (LYSO) scintillator array read out by two SensL SPMArray4B SiPM arrays. DLO bottom (top) layers of: <inline-formula...
We apply deep neural networks (DNN) to data from the EXO-200 experiment. In studied cases, DNN is able reconstruct relevant parameters—total energy and position—directly raw digitized waveforms, with minimal exceptions. For first time, developed algorithms are evaluated on real detector calibration data. The accuracy of reconstruction either reaches or exceeds what was achieved by conventional approaches over course Most existing event classification in particle physics trained Monte Carlo...
Abstract Accurate characterization of quantum yield is crucial to the reconstruction energy depositions in silicon at eV scale. This work presents a new method for experimentally calculating using vacuum UV-sensitive photomultipliers (SiPMs), which can be used determine probabilities that UV photon absorbed crystal will produce one, two, or three electron–hole pairs. Results are presented fully constrain distribution energies up 7.75 eV. works by exploiting saturation detection efficiency...
Presents corrections to the paper, Corrections "Stimulated Secondary Emission of Single-Photon Avalanche Diodes".
Silicon Photomultipliers (SiPMs) are attractive candidates for light detectors next generation liquid xenon double-beta decay experiments, like nEXO (next Enriched Xenon Observatory). In this paper we discuss the requirements that SiPMs must satisfy in order to be suitable and similar describe two test setups operated by collaboration, present results of characterization from several vendors. particular, find photon detection efficiency at peak scintillation emission (175-178 nm) approaches...
Progress on a method of barium tagging for the nEXO double beta decay experiment is reported. Absorption and emission spectra deposits atoms ions in solid xenon matrices are presented. Excitation prominent lines, temperature dependence, bleaching fluorescence reveal existence different matrix sites. A regular series sharp lines observed ${\mathrm{Ba}}^{+}$ identified with some type hydride molecule. Lower limits quantum efficiency principal Ba transition Under current conditions, an image...
Future tonne-scale liquefied noble gas detectors depend on efficient light detection in the VUV range. In past years Silicon Photomultipliers (SiPMs) have emerged as a valid alternative to standard photomultiplier tubes or large area avalanche photodiodes. The next generation double beta decay experiment, nEXO, with 5 tonne liquid xenon time projection chamber, will use SiPMs for detecting $178\,\text{nm}$ scintillation light, order achieve an energy resolution of $\sigma / Q_{\beta\beta} =...
Active pixel sensor (APS) is a promising technology for next-generation vertex detectors. This paper discusses the design and testing of two generations APS chips. Both are arrays 128 by pixels, each 20 /spl mu/m. Each array divided into subarrays in which different structures (4 first version 16 second) and/or readout circuits employed. Measurements several these under Fe/sup 55/ exposure reported. The sensors have also been irradiated 55 MeV protons to test radiation damage. increases...
Arrays of silicon photo-multipliers (SiPMs) are good candidates for the readout detectors in PET/MR inserts due to their high packing density, efficiency, low bias voltage and insensitivity magnetic fields. We tested two dual-layer blocks pixellated lutetium oxy-orthosilicate (LYSO) coupled SensL 4 × SiPM arrays terms ability resolve all elements using resolvability index (RI) defined by FWHM crystal response function divided separation. Our had 49 1.67 6.0 mm <sup...
In this study we present a method of 3D system response calculation for analytical computer simulation and statistical image reconstruction magnetic resonance imaging (MRI) compatible positron emission tomography (PET) insert that uses dual-layer offset (DLO) crystal design. The general functions (SRFs) detector geometric inter-crystal penetration coincident pairs are derived first. We implemented ray-tracing algorithm with 4π sampling calculating the SRFs individual DLO crystals....
Recently, positron emission tomography (PET) is playing an increasingly important role in the diagnosis and staging of cancer. Combined PET X-ray computed (PET-CT) scanners are now modality choice cancer treatment planning. More recently, combination magnetic resonance imaging (MRI) being explored many sites. Combining MRI has presented challenges since photo-multiplier tubes (PMT) do not function high fields, conventional detectors distort images. Solid state light sensors like avalanche...
A full-ring PET insert consisting of 16 detector modules was designed and constructed to fit within the 114 mm diameter gradient bore a Bruker 7 T MRI. The individual contain two silicon photomultiplier (SiPM) arrays, dual-layer offset LYSO crystal high-definition multimedia interface (HDMI) cables for both signal power transmission. Several different RF shielding configurations were assessed prior construction fully assembled using combination carbon fibre copper foil shielding....
Three novel integrated CMOS active pixel sensor circuits for vertex detector applications have been designed with the goal of increased signal-to-noise ratio and speed. First, a large-area native epitaxial silicon photogate was to increase charge collected per hit reduce diffusion neighboring pixels. High voltage conversion is maintained by subsequent transfer low capacitance readout node. Second, per-pixel correlated double sampling kT/C reset noise reduction circuit tested. It requires...
We describe a system to transport and identify barium ions produced in liquid xenon, as part of R&D towards the second phase double beta decay experiment, nEXO. The goal is Ba ion resulting from an extremely rare nuclear isotope 136Xe, hence providing confirmation occurrence decay. This achieved through Resonance Ionization Spectroscopy (RIS). In test setup described here, can be xenon or vacuum collected on clean substrate. substrate then removed analysis chamber under vacuum, where...
Silicon photomultipliers (SiPMs) have high gain, excellent timing performance, and are well suited to PET/MRI applications due, in part, their MR-compatibility small form factor. Within the constraints of a resistor-based multiplexing circuit, it is useful evaluate four generations SiPM arrays manufactured by SensL: SPMArray4, ArraySL-4, ArraySM-4, ArraySB-4. Breakdown voltage dark current were measured as function temperature two each SensL arrays. Flood histograms created with <sup...