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We propose a Cherenkov detector for proton Flux Measurement (CpFM), based on a compact Hamamatsu Micro-Channel Plate photomultiplier tube (MCP-PMT), to outline the fine microbunching structure of the DAFNE Beam-Test Facility (BTF).
We constructed a mini Compton camera based on an array of CdZnTe detectors and assessed its spectral and imaging properties. The entire array consisted of 6×6 Frisch-grid CdZnTe detectors, each with a size of 6×6×15 mm3. Since it is easier and more practical to grow small CdZnTe crystals rather than large monolithic ones, constructing a mosaic array of parallelepiped crystals can be an effective way...
Thallium bromide (TlBr) is a wide bandgap, compound semiconductor with high gamma-ray stopping power and promising physical properties. Several surface modification techniques have been demonstrated to increase the lifetime of TlBr devices at room temperature. However, absence of reproducibility in the performance of TlBr detectors (even with low ionic conduction at −20°C) suggests presence of unexplored...
A new portable gamma-ray imaging spectroscopy system using three dimensional position-sensitive CdTeZe has been built at the University of Michigan. This system uses a first generation digital VAD_UM ASIC jointly developed by Integrated Detector Electronics AS (IDEAS) and the University of Michigan and allows four 20 × 20 × 15 mm3 CdZnTe detectors to be simultaneously read out in either a full readout...
LaBr3:Ce crystal scintillator can be co-doped with various alkaline earth metals to improve light output and energy resolution of the basic scintillator. Another benefit is improvement of alpha/gamma discrimination via pulse shape analysis. LaBr3:Ce contains a low level of actinium contamination, which produces an alpha particle background. This background is difficult to discriminate from gamma rays...
This work deals with the development of a new gamma detector based on Silicon Drift Detectors (SDDs) to read out large (2″ up to 3″) LaBr3:Ce scintillators for gamma-ray spectroscopy for astronomy applications, an activity supported by ESA. SDDs, characterized by high quantum efficiency and low electronic noise, are good candidates in such applications with a wide energy range of gamma rays to be...
The crystal Cs2LiYCl6:Ce (CLYC) is a very interesting scintillator material because of its excellent energy resolution and its capability to identify gamma rays and fast/thermal neutrons. In this work, the response to gamma, thermal and fast neutrons of two CLYC 1“x1” crystals was measured: the first one, enriched with 6Li at 95% is ideal for thermal neutron measurements while the second one, enriched...
In Positron Emission Tomography (PET) detectors based in monolithic scintillators, the spatial resolution is limited by the accuracy in the determination of the interaction coordinates from the 511 keV photons. When linear algorithms, such as Center of Gravity (CoG) are used a poor estimation of the interaction positions, specially towards the edges is the major limitation in spatial resolution. A...
A compact Detector Module for Time-Of-Flight PET integrating 128 gamma-ray detection pixels of 3.5×3.5×15 mm3 LYSO crystals associated to MPPC photosensors has been developed in the framework of the EndoTOFPET-US collaboration. The module has two 64-channel readout ASICs integrating signal conditioning and discrimination circuitry and high-performance TDCs for each channel, featuring 25 ps r.m.s intrinsic...
Gamma ray detectors merging continuous and pixelated crystal arrays are described. We show a pilot study about the detector performance of an innovative scintillation design that simultaneously uses both a continuous and a crystal array. This novel idea is the base of a high-resolution and high-sensitivity gamma ray detector. Alternatively monolithic or crystal arrays can be mounted on the front or...
We present a very compact photo sensor module with an area of 32.8 × 32.0mm2 containing 12 × 12 Silicon Photomultipliers (SiPMs) in a pitch of (2.5mm)2. The readout of the 144 channels is done by highly specialized PETA5 ASICs (Position Energy Timing Asic) which offer self triggered hit detection (including neighbor logic and fast veto mechanisms), time stamping with 50ps bin width and digital amplitude...
We are developing the OpenPET which can provide an open space to make the patient observable and accessible during PET measurements. One of the key technologies for realizing the OpenPET geometry is the depth of interaction (DOI) detectors because the geometry has many oblique lines of response (LORs). Even if the DOI detectors reduce the blurring effect of the thick crystals, it is important to model...
The aim of this work is to provide the characteristics of MPPC as a part of neutron detector based on scintillators with n/γ discrimination capabilities. Measurements presented in the work cover: characterization of n/γ discrimination properties by means of Figure of Merit (FOM); comparison of scintillation light pulse shape measured with MPPC and PMT (rise time and fall time) and its influence on...
Readout electronics are being developed to instrument a high resolution, time-of-flight PET scanner, targeted for breast imaging. The electronics and system design is a modular one, allowing the electronics to be used in many different system geometries. The electronics has been optimized for the H8500 PMT but it could be used to instrument a wide range of other rectangular photosensor arrays. The...
The EndoTOFPET-US collaboration develops a novel multimodal device for Ultrasound (US) Endoscopy and Positron Emission Tomography (PET) for detecting and quantifying novel morphologic and functional biomarkers for pancreas and prostate oncology. The detector is based on scintillating crystals with Silicon Photomultiplier (SiPM) read-out, aiming at a time of flight coincidence time resolution of 200...
For PET cameras the non-uniformity of the sensitivity of the lines of response (LORs) has to be corrected with appropriate normalization coefficients (NCs) in order to generate artifact-free quantitative images. The NCs are commonly estimated by dedicated calibration scan in which the scanner performance is measured for a known activity source. With the conventional normalization methods, proper handling...
In our previous works, we had investigated a pulse width modulation (PWM) based multiplexing readout for a detector that is built from dense stacks of LYSO scintillation crystal elements coupled to position sensitive solid state photomultipliers (PS-SSPMs). In our readout system, each of the PS-SSPM position channel signals are integrated for a set time to obtain event energy and position. In this...
For continuous crystal based PET detector, we develop a Self-organizing Map (SOM) Neural Network Based Positioning Scheme which can achieve 2.07mm average resolution and is feasible for implementation on Field Programmable Gate Array (FPGA). In this paper, we propose the FPGA design of SOM scheme and apply it to our experiment data. Taking advantage of the pipelined and parallel structure, the implementation...
Clinically translatable scintillation detectors employ relatively long crystals (20-30 mm) for increased system sensitivity in whole-body PET. In these high-aspect ratio (HAR) crystals (long and narrow), the degradation in timing performance due to variance in the optical path length of scintillation light is non-negligible. In this work, an accurate, analytical probability density function (p.d.f...
The response of a cylindrical continuous 3″ × 3″ LaBr3:Ce crystal coupled to four Position Sensitive photomultipliers (PSPMT) was studied using a 1 mm collimated beam of 662 keV gamma rays.
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