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We present the new TDAQ system designed for the upgraded MEG experiment, MEG II. It is an assembly of three new boards in a dedicated crate. The system foundation is on the so called WaveDREAM board with DAQ and trigger capabilities accompanied by trigger concentrator boards, to collect information from the detectors and perform real time event reconstruction, and data concentrator boards for DAQ...
We present the progress performed in the development of a digital fully programmable emulator of radiation detectors and front-end electronics of image acquisition systems. The instrument has 64 independent channels with the capability of growing an image that has been a-priori programmed. The growth faithfully emulates the real-time behavior of an acquisition array constituted by 64 detectors, also...
According to current prognosis studies of pancreatic cancer, survival rate nowadays is still as low as 6% mainly due to late detections. Taking into account the location of the disease within the body and making use of the level of miniaturization in radiation detectors that can be achieved at the present time, EndoTOFPET-US collaboration aims at the development of a multimodal imaging technique for...
In this contribution, we present an innovative readout and processing architecture for multi-channel applications that allows the direct connection to the output of the charge preamplifiers and grants the possibility to fully exploit advantages of digital processing. The processor is constituted by the collection of modules (3,2×2,8 in.). Each one manages 8 channels and integrates the hardware and...
We have designed FlexToT, a flexible application specific integrated circuit (ASIC) using time-over-threshold (ToT) techniques for the readout of silicon photomultiplier (SiPM) arrays in positron emission tomography (PET) detectors. The FlexToT ASIC accommodates 16 independent channels in a small die size (2.93 mm by 2.54 mm) with low power consumption (10 mW per channel), providing output signals...
In this contribution, we present a digital fully configurable emulator of radiation detectors and front-end electronics of image acquisition systems. The instrument has 64 independent channels with the capability of growing an image that has been a-priori programmed. The growth faithfully emulates the real-time behavior of an acquisition array constituted by 64 detectors (either based on silicon or...
In recent years, many studies of 2-D oxygen saturation distribution reconstruction have provided easy access to human brain activity regions. However, only a few research focus on the home health care system using this technique. In this paper, we proposed a portable, low cost and real-time distribution reconstruction system of oxygen saturation in 2-D to make diagnosis at home possible. The system...
X-ray computed tomography (CT) images could be improved using iterative image reconstruction if the 3D cone-beam forward- and back-projection computations can be accelerated significantly. We investigated the feasibility of a field-programmable gate array (FPGA) implementation of the separable footprint (SF) forward projector. A 16-bit fixed-point quantization introduces negligible numerical errors...
COMPET is an innovative implementation of a small animal PET scanner using a novel block detector geometry, allowing for a high resolution and high sensitivity. One detector block is built up from layers of long LYSO crystals. Perpendicular and interleaved between the crystals, Wave Length Shifting (WLS) fibers are used. The scintillation light created by a gamma ray interacting with a crystal is...
Coincidence time resolution is one of the most important issues in PET detectors. Improving this resolution is required to increase true event coincidence rates that reduce the noise in the reconstructed images. The aim of this work is to obtain a better time resolution for our PET system designing the most appropriate time extraction digital algorithm. The experimental setup used for this research...
For multi-phase flow in pipelines, the distributions of the individual phases are of significant importance. For this reason a low-energy gamma-ray tomography system has been designed. The set-up uses a 241Am source along with a CdZnTe array to acquire gamma ray attenuation data in different positions of a cross-section plane around a test pipe. A charge sensitive amplifier (CSA) and a fourth-order...
On the research of applied three-dimensional computed tomography (CT) image reconstruction, the high-performance computing problem has always been one of the difficulties and hotspots. As a sort of hardware executed parallel in space domain and reconstructed in time domain, FPGA has developed rapidly in recent years. It has been widely used as high-performance parallel computing accelerating component...
Stereoscopic 3D reconstruction is an important algorithm in the field of Computer Vision, with a variety of applications in embedded and real-time systems. Existing software-based implementations cannot satisfy the performance requirements for such constrained systems; hence an embedded hardware mechanism might be more suitable. In this paper, we present an architecture of a 3D reconstruction system...
This work presents a solution for the cone-beam computer tomography. The modified Feldkamp reconstruction algorithm is implemented as the parallel pipelined structure. The modifications of the original algorithm: parallelization and pipelining of the reconstruction, were formalized. FPGA design of the parallel pipelined backprojector implements all steps of the reconstruction from cone-beam projections:...
It is difficult to acquire the whole scene at the same time, when the size of a requiring scene is beyond the scope of a CCD camera. In this case, the requiring scene can be captured by several CCD cameras at one time, and the overlapped images can be acquired. Using the images, the whole scene is reproduced. This paper presents an approach of using multi-sensor and image mosaics technique to implement...
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