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The presence of the naturally occurring isotope 176Lu gives rise to background count rates in LSO/LYSO crystals to be used in PET and SPECT systems. The aim of this work is to measure 176Lu background count rates and its spatial distributions in a continuous LYSO block. Our results show that the low energy component of 176Lu background is related to partial energy deposition mainly produced near the...
Read out test of inorganic-organic hybrid scintillator; Pr:LuAG single crystal covered with plastic scintillator are demonstrated. The Pr:LuAG sample coated with bis-MSB+TB-PVD containing WLS showed the better light output and energy resolution than the Pr:LuAG itself. Light output was increased up to 55% and energy resolution was also improved to 6.1%@662keV using APD (Hamamats S8664-8220). In the...
The following topics are dealt with: ceramic scintillator based medical imaging system; semiconductor-based imaging systems; neutron dosimeter; thermal-neutron detector; nuclear measurement techniques; and nuclear monitoring techniques.
In order to develop animal SPECT imaging technology on clinical SPECT scanners, we propose a highly flexible multi-pinhole collimator design scheme. The proposed design allows individual adjustment of important system parameters, so that the collimator device is adaptable to various SPECT systems, and one can also optimize different specific aspects of system performance (e.g. improving spatial resolution,...
In this study we investigate a specific animal SPECT imaging system with a clinical SPECT detector and a multipinhole collimator insert. High accuracy geometrical calibration is a crucial technique in terms of achieving the high SPECT imaging resolution. The calibration steps include: 1) The SPECT system is modeled with a geometrical projection equation; 2) The centroids of the point source projection...
We have developed a monolithic scintillator PET detector module based on 25.5mm??25.5mm??10mm LYSO crystal and multi-anode PMT H7546B, and built an experiment setup to test its performance. The impinging position of a 511 keV photon onto the detector is calculated by pre-trained neural networks using the information of the detected scintillation light distribution. A very attractive advantage of the...
A high resolution detector made from 2D modular arrays of scintillation crystals is being developed for our small animal position emission tomography (MicroPET). Their characteristic flood field response (or flood histogram) has been segmented to Crystal Look-up table (CLT), which defines the matching relation between signal position of a detected event to a corresponding detector pixel location....
The CALICE collaboration is developing calorimeters for a future linear collider, and has collected a large amount of physics data during test beam efforts. For the analysis of these data, standard software available for linear collider detector studies is applied. This software provides reconstruction of raw data, simulation, digitization and data management, which is based on grid tools. The data...
The FastCaloSim calorimeter simulation was developed to provide a reasonably accurate but still fast simulation of the ATLAS calorimeter system. Parametrizations of electromagnetic and hadronic calorimeter showers are used to deposit particle energies in the detailed calorimeter structure. In the present document a short overview of the fast calorimeter simulation principle is presented. This is followed...
The current gamma ray/neutron instrumentation development effort at NASA Goddard Space Flight Center??s Astrochemistry Laboratory aims to extend the use of neutron interrogation techniques, using a 14 MeV Pulsed Neutron Generator (PNG) combined with neutron and gamma ray detectors, to probe the surface and subsurface of planetary bodies in situ without the need to drill. One aspect of the current...
A 3D, through silicon via microelectronic process, capable of face-to-face assembling two 130 nm CMOS tiers in a single bi-layer wafer, has been exploited for the design of monolithic active pixels (MAPS), featuring a deep N-well (DNW) collecting electrode. They are expected to improve on planar CMOS DNW MAPS in terms of charge collection efficiency since most of the PMOS transistors in the front-end...
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