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Mr Nicolas OLLIVIER-HENRY (Institut Pluridisciplinaire Hubert-Curien, UMR 7178 CNRS/ULP)10/05/2006, 14:00• Electronics, read out, data acquisitionposterToday, the main challenge of Positron Emission Tomography (PET) systems dedicated to small animal imaging is to obtain a high efficiency event data collection with a good sensibility and a high accurate localization. If the focus is only on the PET characteristics, an accurate spatial resolution depends as well on the design of detector as its electronics readout system. In this...Go to contribution page
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Prof. Francesco Corsi (DEE - Politecnico di Bari), Prof. Giorgio Pignatel (Univerità di Perugia)10/05/2006, 14:00• Electronics, read out, data acquisitionposterMolecular imaging by radionuclides is a very powerful technique to study mouse models and to understand fundamental genetic and biochemical processes. The development of compact, high-resolution gamma cameras, based on both single photon (SPECT, E=140 keV) and positron emission (PET, E=511keV) techniques calls for dedicated compact detectors characterised by both high spatial...Go to contribution page
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Prof. Ioannis Kandarakis (Department of medical instrumentation-Technological Educational Institution of Athens, 12210 Egaleo, Greece)10/05/2006, 14:00• Conversion materials and photodetectorsposterThe light emission performance of the x-ray excited CsI: Tl single crystal scintillator was investigated as a function of x-ray tube voltage and crystal thickness. Five CsI: Tl single crystal layers (CRYOS Ltd., Ukraine) with thickness from 1 to 7 mm were irradiated employing two x-ray tube voltage ranges: (i) The 22 - 45 kV (molybdenum anode-molybdenum filter (Mo/Mo)) range,...Go to contribution page
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Mr Jung Yeol Yeom (University of Tokyo)10/05/2006, 14:00• Electronics, read out, data acquisitionposterIndividual readout of detectors in Positron Emission Tomography (PET) scanners give a better spatial resolution and counting rate over light sharing or charge division schemes. However, this will greatly increase the number of readout channels and is difficult to implement with bulky conventional front-end electronics especially with small detector systems like animal PET. To achieve...Go to contribution page
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Mr Ilia Britvitch (ETH, Zurich, Switzerland)10/05/2006, 14:00• Conversion materials and photodetectorsposterRecently developed multipixel Geiger-mode avalanche photodiodes (GAPDs) are very promising candidates as detectors of the light from scintillating crystals or fibers in medical imaging (e.g. positron emission tomography) as well as in high energy physic and astrophysical applications. They are specially well suited for morpho-functional imaging (multimodality PET/CT, SPECT/CT, PET/MRI,...Go to contribution page
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Dr Fuyuki Tokanai (Yamagata University)10/05/2006, 14:00• Conversion materials and photodetectorsposterA capillary plate (CP) gas detector with fibre optics plate (FOP) filled with argon gas mixture and pure xenon gas has been successfully operated as a gas scintillation proportional counter. Gas gains of up to 104 can be achieved with these gas mixtures. Scintillation light simultaneously emitted during the development of electron avalanches can be observed through the FOP using a...Go to contribution page
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Mr benoit hautefeuille (Laboratoire de Physico-Chimie des Matériaux Luminescents (LPCML) UMR 5620, Université Claude Bernard Lyon 1, Domaine scientifique de la Doua, 69 622 Villeurbanne, France)10/05/2006, 14:00• Conversion materials and photodetectorsposterSingle crystal fibers have become a research attraction in terms of both their fundamental and technological originality for various applications, such as lasers, non linear optics or scintillators. We will expose the growth of scintillating fibers using the micro pulling down technology. This technology allows the growth of single crystal fibers with diameter ranging from 0.5 to 3 mm...Go to contribution page
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Prof. Roberto Pani (INFN)10/05/2006, 14:00• Conversion materials and photodetectorsposterRadionuclide imaging is a common non-invasive technique used in the evaluation of cardiac function and disease. Currently, planar and SPECT imaging are used in nuclear cardiology to perform gated equilibrium blood pool imaging, myocardial perfusion imaging and first-pass imaging. More than one-third of all nuclear imaging procedures are cardiac imaging and most of these are myocardial...Go to contribution page
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Francois Powolny (CERN - 1211 Geneva 23, Switzerland)10/05/2006, 14:00• Electronics, read out, data acquisitionposterIn the framework of the European FP6’s BioCare project, we develop a novel photodetector readout technique to increase sensitivity and timing precision for molecular imaging in PET and CT. Within the Project’s work packages, the CERN- BioCare group focuses on the development of a PET detection head suitable to process data from both PET and CT operation in one unit the latter at a rate...Go to contribution page
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Mr Jean-Marc Reymond (CEA/DSM/DAPNIA)10/05/2006, 14:00• Electronics, read out, data acquisitionposterMolecular imaging using Positron Emission Tomography (PET) in small rodents commonly requires the knowledge of the input function of the tracer (development of new drugs or new tracers …). In this paper, we report the status and the performances of a prototype of a counting system under development at DAPNIA(1) in collaboration with SHFJ(2). The detection device consists on six silicon...Go to contribution page
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Dr Alexey Stoykov (Paul Scherrer Institut)10/05/2006, 14:00• Conversion materials and photodetectorsposterAvalanche Microchannel PhotoDiodes (AMPDs) are solid state photodetectors with high internal gain and density of independent channels up to 10^4/mm^2. They are potential substitutes for photomultiplier tubes in a wide variety of applications in nuclear physics and nuclear medicine. The use of AMPDs is most promising when fine segmentation of the detectors and their operation in high...Go to contribution page
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Mr Rejean Fontaine (Université de Sherbrooke)10/05/2006, 14:00• Electronics, read out, data acquisitionposterThe recent introduction of all-digital electronic architecture in Positron Emission Tomography (PET) scanners enables new paradigms to be explored for extracting relevant information from the detector signals, such as energy, time and crystal identification. The LabTEP(tm) small animal scanner, which implements free-running 45-MHz sampling directly at the output of the charge...Go to contribution page
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Dr Angelo La Manna (Università di Palermo Dipartimento di Fisica e Tecnologie Relative), Prof. Gaetano Gerardi (Università di Palemo Dipartimento di Fisica e Tecnologie Relative)10/05/2006, 14:00• Electronics, read out, data acquisitionposterPile-up distortion is a major drawback in X-ray spectroscopy at high count rate. Signal processing can help to overcome this problem. Pulse width narrowing with shaping tecniques can lead to reduction of pile-up distortion; however, a low shaping time reduces the noise filtration and leads to a poor energy resolution. Hence the optimum shaping time is a compromise between noise and...Go to contribution page
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Mr Stratos David (Department of Medical Physics, University of Patras, Patra, Greece)10/05/2006, 14:00• Conversion materials and photodetectorsposterThe aim of the present study was to examine the light emission efficiency of Lu2SiO5:Ce (LSO) powder scintillator under X-ray mammographic imaging conditions. Powder LSO scintillator has never been used in X-ray imaging. For the purposes of the present study a 25 mg/cm2 thick scintillating screen was prepared in our laboratory, by sedimentation of Lu2SiO5:Ce powder. Absolute...Go to contribution page
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Dr weidong Xiang (College of Applied Technology, Wenzhou University)10/05/2006, 14:00• Conversion materials and photodetectorsposterZinc oxide (ZnO) single crystal has attracted much attention due to its potential application in ultra violet (UV) and blue light-emitting devices. In addition, ZnO crystal is a promising fast scintillator. It is reported that doped ZnO crystals exhibited pulse rise-times <100ps and fall times <1ns, which are faster than any currently available scintillators. However, it is difficult...Go to contribution page
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Dr Valentino Orsolini Cencelli (NFN - Sezione di Roma III)10/05/2006, 14:00• Conversion materials and photodetectorsposterIn this paper we present a new readout system for the H8500 flat panel photomultiplier. The system is based on the MAX1320 Analog to digital converter and reads all the 64 anodic signal simultaneosly at a rate that approaches the 250 Ksample/second typical of MAX1320 with a resolution of 14 bits. The data are read throug an FPGA by an on Chip Computer, the ETRAX 100LX, and...Go to contribution page
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Dr Jacques Bourgoin (GESEC R&D)10/05/2006, 14:00• Conversion materials and photodetectorsposterX-ray detectors require large Z materials in order to absorb X-ray radiations sufficiently. In case of X-ray imaging, fluorescence becomes one of the limiting factors for spatial resolution and contrast at X-ray energies above the ka threshold (typical average values are 10 keV, 25 keV and 30 keV for GaAs, CdTe and CsI, respectively). Since both the energy and yield of the fluorescence...Go to contribution page
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Mr Cedric Lemaître (Vrije Universiteit Brussel)10/05/2006, 14:00• Conversion materials and photodetectorsposterThe absence of very small crystal pixels in monolithic scintillation detectors has a number of potential advantages such as higher sensitivity, better energy resolution and continuous coordinates. In such detectors, the incidence position of the 511 keV photons on the detector surface is derived from the measured scintillation light distribution. To extract this information, we used...Go to contribution page
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Anatoli Konoplyannikov (CERN, Geneva, Switserland)10/05/2006, 14:00• Electronics, read out, data acquisitionposterThe calorimeter system in LHCb aims to identify electrons, photons and hadrons. The system plays also a major role for the first level triggers. All calorimeters are equipped with Hamamatsu photo tubes as devices for light to signal conversion. Eight thousand R7899-20 tubes are used for electromagnetic and hadronic calorimeters and two hundred 64 channels multi-anode R7600 -00-M64 for...Go to contribution page
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A. Campisi (INFN-Laboratori Nazionali del Sud, Via Santa Sofia 64, 95125 Catania Italy)10/05/2006, 14:00• Conversion materials and photodetectorsposterWe developed and tested prototype arrays of Single Photon Avalanche Detectors (SPAD), fabricated in silicon planar technology and working at low voltage (» 30 V) in Geiger mode operation, to achieve a photon-resolving operational mode; the size of the elementary cells is from 20 µm up to 100 µm. Coupling such a multipixel sensor to light sources as scintillators and laser, we have...Go to contribution page
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Ms Carole MARMONIER (Photonis)10/05/2006, 14:00• Conversion materials and photodetectorsposterIn this presentation, we will develop two main aspects of the developments cureently being held within the Photonis group. We will first describe our new Time Of Flight - PET photomultipliers and discuss their results obtained with several type of scintillators (standards and new fast crystals). We will then present our new developements in multipixel detection : Planacon and XP9100-16 PMT.Go to contribution page
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Dr Ashot Petrosyan (Institute for Physical Research, 378410 Ashtarak-2, Armenia)10/05/2006, 14:00• Conversion materials and photodetectorsposterOptical properties (absorption in UV, slope of the optical edge, transmission and color centers induced by UV-light or intentional doping) of LuAP:Ce, LuAP:Hf and LuAP:(Ce, Hf) crystals were studied to establish compositions leading to the smallest absorption at 260 nm and the highest transparency in the range of emission. A low underlying absorption attained in Bridgman LuAP:Ce...Go to contribution page
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Prof. Igor Sokolov (Deputy head of laboratory)10/05/2006, 14:00• Conversion materials and photodetectorsposterGaAs detectors for registration of X-radiation and gamma radiation are found applications in medicine and for the tasks of high-energy physics. Since the registered signals are small enough the main problem of such devices can be formulated as follows - realization of maximal detector volume keeping constant low noise level. The capacity and return current should be minimized. The is...Go to contribution page
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Dr Boris Shulgin (Professor)10/05/2006, 14:00• Conversion materials and photodetectorsposterOptical filters of vision, IR- and UV-regions are found of wide application for science investigation systems, for medical diagnostic equipments, for chemical analytic equipments, for thermal imaging systems, for security systems and sensors of burglar alarm systems and so on. The base materials for creation of modern optical filters are thin organic polymer films. The main...Go to contribution page
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Dr Danielle Moraes (CERN)10/05/2006, 14:00• Conversion materials and photodetectorsposterNew semiconductor detectors have recently gained a lot of attention for medical applications in general. Advances in semiconductor detector arrays made of CdZnTe or CdTe may improve both energy resolution and spatial resolution of clinical x-ray systems. Alternative system designs based on TFA technology combining photodetector arrays with CMOS electronics open a possibility for...Go to contribution page
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Mr Nam Young Kim (Chung-Ang University)10/05/2006, 14:00• Electronics, read out, data acquisitionposterWe are currently developing a Compton camera for applications in nuclear medical and molecular imaging. A Compton camera uses two sets of radiation detectors for which incident gamma rays are Compton-scattered in the first detector and the scattered gamma rays are then fully stopped via the photoelectric effect in the second detector. Interaction points in both detectors provide the...Go to contribution page
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Dr Raffaele Scafè (Casaccia Research Center, ENEA, Rome, Italy and INFN, University of Rome “La Sapienza”, Rome, Italy)10/05/2006, 14:00• Conversion materials and photodetectorsposterLaBr3:Ce represents a very promising scintillation crystal for spectrometric and imaging devices, thanks to its good scintillation properties as the high light yield (61000 photons per MeV) which allows excellent energy resolution values (3% FWHM at 662keV). It is attracting the scientific community for the potential improvement of PET and SPECT instrumentation. First measurements of...Go to contribution page
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Dr Raffaele Scafè (Casaccia Research Center, ENEA, Rome, Italy)10/05/2006, 14:00• Conversion materials and photodetectorsposterThis work is aimed to design a gamma-ray scintillation detector, suitable for radionuclide imaging and able to measure event-by-event the energy and the point-of- interaction of primary radiation. In principle, to obtain these quantities, multi- face readout of a parallelepiped crystal is necessary. Light intensity values from each crystal face are used for centroiding the event through...Go to contribution page
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Prof. Valeri Saveliev (Obninsk State University)10/05/2006, 14:00• Conversion materials and photodetectorsposterDevelopment of photodetectors for detecting of low intensity photon flux is one of the critical issues for experimental physics, medical imaging system and many others. Review of silicon photomultipliers SiPM, novel type of avalanche photodetector with Geiger mode operation is presented. The structure of photodetector is based on the matrices of microcells with density of 1500/mm2,...Go to contribution page
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Mr Julien lollierou (IPNL (Institut de Physique Nucléaire de Lyon))10/05/2006, 14:00• Electronics, read out, data acquisitionposterWe present our technical studies of an automated slow control system able to control a small animal PET (Positron Emission Tomography) Gantry. It consists of a cable-less powered embedded acquisition cards, that include the detectors, that are wireless and interfaced with the main data acquisition system; both connected to an event builder computer station. The gantry angle position...Go to contribution page
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Yuri Musienko (Northeastern University)10/05/2006, 14:00• Conversion materials and photodetectorsposterMultipixel Geiger mode APDs (also known as MRS APDs, AMPDs and SiPMs) with different structures and sensitive areas (from 1x1 mm^2 to 3x3 mm^2) have been studied as a readout for LSO, LYSO and LYAP scintillator crystals. Energy and timing spectra were measured using Cs-137 and Na-22 gamma sources. The results of this study allows us to conclude that this photodetector is a very...Go to contribution page
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Alberto Gola (Politecnico di Milano and INFN Italy)10/05/2006, 14:00• Electronics, read out, data acquisitionposterThe scope of the DRAGO project, supported by Italian INFN, is the realization of a high resolution, compact gamma ray imager, based on the Anger camera principle. In this configuration, the light generated by a unique scintillator is read by an array of 77 Silicon Drift Detectors. In order to locate the position of interaction of the photon inside the scintillator it is necessary to...Go to contribution page
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Dr Alla Reznik (Sunnybrook&Women’s College Health Sciences Centre)10/05/2006, 14:00• Conversion materials and photodetectorsposterThe design and proof-of-principle results for an MRI-compatible detector module for PET are reported. The proposed detector has a finely pixelated Cerium-doped Lutetium Yttrium Orthosilicate (LYSO) array in optical contact with an array of a- Se avalanche photosensors. The quantum efficiency of the a-Se photosensor was measured as a function of the wavelength of optical...Go to contribution page
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Mr Angelo La Manna (DIFTER University of Palermo)10/05/2006, 14:00• Conversion materials and photodetectorsposterAbstract X-ray spectra and dosimetry information are very important for quality assurance in X-ray diagnostic systems. Several semiconductor detectors (Si, Ge) have been proposed for medical X-ray measurements [1,2]. Recently, cadmium telluride (CdTe) semiconductor is promising X-ray detector and is suitable for portable systems. The number of papers investigating the physical and the...Go to contribution page
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Mr Patrick Pangaud (Centre de Physique des Particules de Marseille (CPPM), France)10/05/2006, 14:00• Electronics, read out, data acquisitionposterThe XPAD3 (X-ray Pixel chip with Adaptable Dynamics) circuit is the next generation of 2D X-ray photon counting imaging chip to be connected to a pixel sensor using the bump and flip-chip technologies. This circuit, designed in submicronic (0.25µm) IBM technology, contains 9600 pixels (130um x 130um) distributed into 80 columns of 120 elements each. Its features have been improved to...Go to contribution page
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