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A prototype CdTe pixel detector system with 19 pixels arranged in a 200um pitch hexagonal format is being developed for energy resolved medical X-ray imaging applications; this device should be capable of detecting input photon rates of up to 2*108 counts per mm2 and energy resolution of approximately 5% at 122keV. This paper presents a description of this system along with the initial spectral and...
Compound semiconductors detectors, such as Cadmium Telluride (CdTe) and Cadmium Zinc Telluride (CdZnTe), have demonstrated spectroscopic performances for X- and Gamma-ray detection at room temperature operation. Several groups are working on using these detector materials for use in high rate photon counting / energy resolving pixelated detector systems. This paper is focused on the modelling from...
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 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...
The hardware, firmware and software required to perform digital signal processing and data acquisition for a prototype pixelated cadmium zinc telluride (CZT) nuclear spectroscopic detector developed at the Monash Centre for Synchrotron Science has been implemented and assessed. The system uses a modular PCI-Card design incorporating a CycloneII?? FPGA with three daughter boards facilitating analogue...
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 fabricated analog application specific integrated circuit (ASIC) is a front-end circuit for multichannel pixel detector system. The designed ASIC provides signal amplification for a pixelated arrays of 1 mm and 200 ??m pitch pixel detectors made from cadmium telluride (CdTe) and cadmium zinc telluride (CZT) detector. Both the detector and ASIC are combined to target future high intensity research...
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