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An integrated and comprehensive model of a hybrid pixel detector has been developed by using Matlab and Simulink. Prior to this streamlined model, various team members (physicists, electronics and software engineers) used different software tools to separately simulate individual entities of the system. As a consequence, it was difficult to exchange and integrate the results, as well as to interpret...
The pixelated emission detector for radioisotopes (PEDRO) is a hybrid emission imaging system designed for the measurement of single photon emission from small animals. The PEDRO is based on the combination of mechanical and electronic collimation (through the Compton effect). It utilizes a Compton-camera stack geometry situated behind an aperture array to modulate the incident radiation. The geometry...
A proof-of-principle single photon emission imaging (SPEI) system is being constructed and validated against Geant4 Monte-Carlo simulations, with the intention of determining the optimal detector configuration for imaging the evolution of induced matastices in small animals. This device consists of a Compton-camera situated behind a mechanical modulator. The combination of mechanical and electronic...
The most common form of read-out electronics for radiation detection at the pixel basis can be described as a signal processing channel consisting off: detector pixel, preamplifier, pulse shaper and A/D converter. The signal generation starts when a photon interacts with a detector, resulting in a charge which amount is proportional to the photon energy. The charge is further processed by either a...
The distinctive challenges for design of read-out ASICs for radiation detectors in biomedical applications originate from the need to be interfaced to detectors with high density of pixels and process photons with high rates. Those two dominant factors impose a range of conflicting restrictions and demands on the design of the readout integrated circuits (ROIC). Some of the key challenges are: limited...
Cadmium Zinc Telluride (CZT) and Cadmium Telluride (CdTe) detectors with 200 μm pixellated electrodes were tested with the aim to determine material properties and electrical parameters for hybrid pixel detector (HPD) systems. A 32 channel discrete analogue preamplifier platform was designed and manufactured in which radiation tests were performed on packaged detectors. Although simple in concept,...
Current medical imaging technology for computed tomography (CT) and radiographic applications are based on either indirect or direct integrating X-ray detectors. The resulting image contrast is based on the differences between the X-ray absorption properties of the object being imaged. Contrast in biomedical samples that contain soft tissues can be poor due to similar densities and elemental composition...
The instrumentation group at the Monash Centre for Synchrotron Science have developed a low cost generic data acquisition system. This system is to be used in a variety of applications and to assist in the design and testing of emerging detectors. The system utilises a desktop PC which interfaces to a detector via one or more custom 64-bit PCI cards, each equipped with an Altera CycloneIItrade FPGA...
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