Mr
Nicolas OLLIVIER-HENRY
(Institut Pluridisciplinaire Hubert-Curien, UMR 7178 CNRS/ULP)
10/05/2006, 14:00
• Electronics, read out, data acquisition
poster
Today, 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...
Prof.
Francesco Corsi
(DEE - Politecnico di Bari), Prof.
Giorgio Pignatel
(Univerità di Perugia)
10/05/2006, 14:00
• Electronics, read out, data acquisition
poster
Molecular 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...
Prof.
Ioannis Kandarakis
(Department of medical instrumentation-Technological Educational Institution of Athens, 12210 Egaleo, Greece)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
The 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,...
Mr
Jung Yeol Yeom
(University of Tokyo)
10/05/2006, 14:00
• Electronics, read out, data acquisition
poster
Individual 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...
Mr
Ilia Britvitch
(ETH, Zurich, Switzerland)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
Recently 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,...
Dr
Fuyuki Tokanai
(Yamagata University)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
A 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...
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 photodetectors
poster
Single 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...
Prof.
Roberto Pani
(INFN)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
Radionuclide 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...
Francois Powolny
(CERN - 1211 Geneva 23, Switzerland)
10/05/2006, 14:00
• Electronics, read out, data acquisition
poster
In 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...
Mr
Jean-Marc Reymond
(CEA/DSM/DAPNIA)
10/05/2006, 14:00
• Electronics, read out, data acquisition
poster
Molecular 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...
Dr
Alexey Stoykov
(Paul Scherrer Institut)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
Avalanche 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...
Mr
Rejean Fontaine
(Université de Sherbrooke)
10/05/2006, 14:00
• Electronics, read out, data acquisition
poster
The 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...
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 acquisition
poster
Pile-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...
Mr
Stratos David
(Department of Medical Physics, University of Patras, Patra, Greece)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
The 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...
Dr
weidong Xiang
(College of Applied Technology, Wenzhou University)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
Zinc 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...
Dr
Valentino Orsolini Cencelli
(NFN - Sezione di Roma III)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
In 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...
Dr
Jacques Bourgoin
(GESEC R&D)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
X-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...
Mr
Cedric Lemaître
(Vrije Universiteit Brussel)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
The 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...
Anatoli Konoplyannikov
(CERN, Geneva, Switserland)
10/05/2006, 14:00
• Electronics, read out, data acquisition
poster
The 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...
A. Campisi
(INFN-Laboratori Nazionali del Sud, Via Santa Sofia 64, 95125 Catania Italy)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
We 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...
Ms
Carole MARMONIER
(Photonis)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
In 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.
Dr
Ashot Petrosyan
(Institute for Physical Research, 378410 Ashtarak-2, Armenia)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
Optical 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...
Prof.
Igor Sokolov
(Deputy head of laboratory)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
GaAs 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...
Dr
Boris Shulgin
(Professor)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
Optical 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...
Dr
Danielle Moraes
(CERN)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
New 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...
Mr
Nam Young Kim
(Chung-Ang University)
10/05/2006, 14:00
• Electronics, read out, data acquisition
poster
We 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...
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 photodetectors
poster
LaBr3: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...
Dr
Raffaele Scafè
(Casaccia Research Center, ENEA, Rome, Italy)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
This 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...
Prof.
Valeri Saveliev
(Obninsk State University)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
Development 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,...
Mr
Julien lollierou
(IPNL (Institut de Physique Nucléaire de Lyon))
10/05/2006, 14:00
• Electronics, read out, data acquisition
poster
We 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...
Yuri Musienko
(Northeastern University)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
Multipixel 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...
Alberto Gola
(Politecnico di Milano and INFN Italy)
10/05/2006, 14:00
• Electronics, read out, data acquisition
poster
The 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...
Dr
Alla Reznik
(Sunnybrook&Women’s College Health Sciences Centre)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
The 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...
Mr
Angelo La Manna
(DIFTER University of Palermo)
10/05/2006, 14:00
• Conversion materials and photodetectors
poster
Abstract
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...
Mr
Patrick Pangaud
(Centre de Physique des Particules de Marseille (CPPM), France)
10/05/2006, 14:00
• Electronics, read out, data acquisition
poster
The 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...
