Description
Poster Session 3 - Medical, PET and Biological
Mr
Thomas Leadbeater
04/09/2008, 15:10
PET applications
Poster
A high speed PC-based data acquisition system for use with positron imaging systems (e.g. ECAT scanners designed by CTI / Siemens) is presented. This system replaces old dedicated hardware with a compact, flexible device with the same functionality and superior performance. Data acquisition rates of up to 80 MBytes per second allow coincidence data to be saved to disk for real-time analysis or...
Mr
Alexander Grint
04/09/2008, 15:10
Applications in Nuclear Medicine and Radiology
Poster
This work describes the development of a dual layer Compton camera [1] to produce a 3D source image with a greater sensitivity than the mechanical collimation technique [2], presently used for SPECT (Single Photon Emission Computed Tomography) in medicine. The imaging of low energies is of particular importance as the current isotope of choice for SPECT in medicine is 99mTc, emitting photons...
Mr
Jose M Monzo
04/09/2008, 15:10
PET applications
Poster
A digital procedure is proposed in this work to improve time resolution in PET systems based in a low-pass filter interpolation plus a Digital Constant Fraction Discriminator (DCFD). It is analyzed the best way to implement this algorithm applied to our dual head PET system. Our detector uses two continuous LSO crystals each with a position sensitive PMT. Detector signals are adapted using a...
Dr
Alireza Sadrmomtaz
04/09/2008, 15:10
PET applications
Poster
The technique of positron emission particle tracking (PEPT) was developed at the Birmingham University and has proved an extremely powerful tool for studying flow processes inside real laboratory-scale process equipment. In PEPT, a single radioactively-labelled tracer particle is tracked by detecting simultaneously. Routine studies use the ADAC Forte positron camera consisting of two planner...
Chae hun Lee
(KAIST)
04/09/2008, 15:10
PET applications
Poster
An SiPM is a good candidate for PET-MRI systems to overcome problems of conventional PMTs. In this paper, a virtual guard ring and wafer trench in SiPM active areas were adopted to prevent the premature breakdown in the curvature junction. N+/p-/p/π/p+ doping structure was simulated and designed to improve avalanche trigger probability. In order to improve the fill factor in small sized...
Dr
Eiji Yoshida
(National Institute of Radiological Sciences)
04/09/2008, 15:10
PET applications
Poster
Conventionally, PET scanners are used for the scintillator has high effective atomic number. Recently, novel scintillators like LaBr3 have excellent timing and energy resolutions were developed. LaBr3 has high performance for the PET scanner, but effective atomic number is lower than LSO. On the other hand, we developed the scatter reduction method using depth-of-interaction (DOI) information...
Fernando Mateo
(Universidad Politécnica de Valencia)
04/09/2008, 15:10
PET applications
Poster
Traditionally, the most popular technique to predict the impact position of gamma photons on a PET detector has been Anger’s logic. However, it introduces nonlinearities that compress the light distribution, reducing the useful field of view and the spatial resolution, especially at the edges of the crystal scintillator. In this work we make use of neural networks to address a bias-corrected...
Mr
Matthew Dimmock
04/09/2008, 15:10
Applications in Nuclear Medicine and Radiology
Poster
The PorGamRayS project is developing a proof of principle Portable Gamma Ray Spectrometer to perform Compton imaging in the energy range from 60keV to 2.0MeV. This novel detection system will be used for the remote imaging of the radiation field in a wide range of industrial and environmental applications. It will be constructed from a stack of room temperature semiconductors that will consist...
Dr
Christopher Hall
04/09/2008, 15:10
Applications in Nuclear Medicine and Radiology
Poster
Digital Subtraction Angiography is an important technique used to image arterial blood flow using an introduced contrast agent. A mask image (using no contrast agent) is initially acquired which is subtracted from subsequent images after introduction of the contrast agent, resulting in images of the only the agent used. However, given a detector that measures position and energy rather than...
Dr
Bipin Singh
04/09/2008, 15:10
Applications in Nuclear Medicine and Radiology
Poster
Dedicated high-speed microCT systems are being developed for noninvasive screening of small animals. Such systems require scintillators with high spatial resolution, high light yield, and minimal persistence to ensure ghost free imaging. Unfortunately however, afterglow associated with the microcolumnar CsI:Tl scintillator screens used in current high speed systems introduce image lag, leading...
Dr
Christoph Werner Lerche
(Universidad Politecnica de Valencia, Spain)
04/09/2008, 15:10
PET applications
Poster
The center of gravity algorithm leads to strong artifacts for gamma-ray imaging detectors that are based on monolithic scintillation crystals and position sensitive photo-detectors. This is a consequence of using the centroids as position estimates. The charge division circuits which are used to compute the centroids can also be used to compute the standard deviation of the scintillation light...
Ms
Laura Harkness
04/09/2008, 15:10
PET applications
Poster
Conventional gamma -camera systems utilise mechanical collimation to provide information on the position of an incident gamma-ray photon. Systems that use electronic collimation utilising Compton Image reconstruction techniques have the opportunity to offer huge improvements in detection sensitivity. Such systems have been previously limited by the relatively poor energy resolution of the...
Mr
Gyuseong Cho
04/09/2008, 15:10
Applications in Nuclear Medicine and Radiology
Poster
Presently the gamma camera system is widely used in various medical diagnostic, industrial and environmental fields. Hence, the quantitative and effective evaluation of its imaging performance is essential for design and quality assurance. The NEMA standards for gamma camera evaluation are insufficient to perform sensitive evaluation. In this study, MTF(modulation transfer function),...
Mr
Khalid Alzimami
04/09/2008, 15:10
Applications in Nuclear Medicine and Radiology
Poster
The utility of 18F-deoxyglucose (18-FDG) in cardiology, oncology, and neurology has generated great interest in a more economical ways of imaging 18FDG than conventional PET scanners. The main thrust of this work is to investigate the potential use of LaBr3:Ce materials in a low-cost FDG-SPECT system compared to NaI(Tl) using GATE Monte Carlo simulation.. System performance at 140 keV and 511...
Mr
David Oxley
04/09/2008, 15:10
PET applications
Poster
The application of position sensitive semiconductor detectors in medical imaging is a field of global research interest. The Monte-Carlo simulation toolkit GEANT4 [1] was employed to better the understanding of detailed γ-ray interactions within the small animal Positron Emission Tomography (PET) imaging system, SmartPET [2]. The two SmartPET detectors [3] are planar, orthogonally segmented,...
Dr
Wasi Faruqi
04/09/2008, 15:10
Position Sensitive Detectors for Biology
Poster
Recent progress in detector design has created the need for a careful side-by-side comparison of the modulation transfer function (MTF) and resolution-dependent detective quantum efficiency (DQE) of existing electron detectors, including film, with detectors based on new technology. We will present the results of measurements of the MTF and DQE of several detectors at 120 and 300ke. MTF and...
Dr
Tatsuya Nakamura
04/09/2008, 15:10
Applications in Nuclear Medicine and Radiology
Poster
An effective pixel size of a two-dimensional wavelength shifting fibre (WLSF) neutron image detector was improved from 0.5 mm down to 0.17 mm with implementing a fibre optic taper (FOT). The main part of the prototype detector consisted with a thin ZnS/6LiF screen, the FOT, and the crossed WLSF ribbons for x and y coordinate. The WLSF image detector had 16 x 16 fibre channels and the light...
