The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
GEMINI is a readout ASIC dedicated to the Triple-GEM detector. Fabricated in CMOS 180 nm technology, GEMINI pushes towards the state-of-the-art for this peculiar detector front-end, as regards the count rate and detector pixel parasitic capacitance sustainability. It features 16 channels, each one including a charge-sensitive preamplifier, an event discriminator with channel-independent threshold...
The importance of pre-clinical research of single photon emission computed tomography(SPECT) imaging is now widely recognized. For the demand of high resolution and high detection efficiency, SPECT has been developed in several ways and it is simultaneously making demand for high quality imaging. This paper introduces the newly proposed dual-head L-SPECT system and investigates the initial performance...
An 8-channels read-out front-end for LHC ATLAS Muon-Drift-Tubes detectors is presented (8xAFE). The system is composed by the cascade of the analog signal processing FrontEnd and of the Wilkinson A/D (to perform voltage-to-time conversion for time-over-threshold detection). The sensitivity at the output of the analog signal processing chain is 13.8mV/fC, while the Equivalent-Noise-Charge (ENC) is...
Uncovering information from large data streams containing changes in the data distribution (concept drift) make online learning a challenge that is progressively becoming more relevant. This paper proposes Drift Detection Ensemble (DDE), a small ensemble classifier that aggregates the warnings and drift detections of three concept drift detectors aiming to improve the results of the individual methods...
High resolution capacitance-to-digital converters (CDC) usually have severe capacitance range limitations or high power consumption. This paper presents a power detection based 16-bit CDC with a maximum capacitance range superior to 1 nF and a capacitance resolution as small as 0.27 fF. This work's multi-stage power detector provides the CDC with three different sensitivity rates making it highly...
The European XFEL is an extremely brilliant Free Electron Laser Source with a very demanding pulse structure: trains of 2700 X-Ray pulses are repeated at 10 Hz. The pulses inside the train are spaced by 220 ns and each one contains up to 1012 photons of 12.4 keV, while being ≤ 100 fs in length. AGIPD (Adaptive Gain Integrating Pixel Detector) is a hybrid 1M-pixel detector developed by DESY, PSI, and...
The performance of a spectrometry system (SPEC) for identification of trace activities in water is presented. The SPEC detector is a part of the TAWARA_RTM platform designed for monitoring of water processed for distribution by the Waterworks Company. The SPEC system is dedicated for identification of radioisotopes emitting γ-rays of energies between 50 keV and 2 MeV. The SPEC detector comprises a...
Vulnerability of drinking water distribution systems which would have major public health, economic and psychosocial consequences, has become a big concern to governmental agencies and water supply authorities. In case of an extremely alerting situation, such as Fukushima, the alpha emitters in water are probed on samples after very long chemical operations and time for the delivery of results extends...
Continuous scintillator crystals can offer several advantages over pixellated crystals. Apart from an increase of the active volume, spatial resolution is not limited to the crystal size and Depth of interaction (DoI) can be estimated from the light distribution. Continuous crystals coupled to finely segmented photodetectors can improve simultaneously spatial resolution and sensitivity, the main two...
We present the results of our experimental and theoretical studies of fast neutron detection efficiencies of a newly-developed multi-layer scintillation detector comprised of a series of alternating layers of a composite inorganic scintillator material and an optically transparent plastic scintillator material (brand ZEBRA). We investigated the response of this type of detector to neutrons from 239...
Dedicated brain PET scanner becomes an important tool for early diagnosis of Alzheimer's disease and brain function studies. The spatial resolution of the PET system can be improved by use of advanced depth-of-interaction (DOI) detectors, and its sensitivity can be enhanced by increasing its solid angle. Conventionally, PET scanners are designed based on a cylindrical geometry, and the sensitivity...
The desire to understand normal and disordered human brain of upright, moving persons in natural environments motivates the development of an ambulatory micro-dose brain PET imager (AMPET) [1]. An ideal system would be light weight and have high sensitivity and spatial resolution. These requirements are often in conflict with each other. Therefore, we performed simulation studies to search for the...
One of the challenging applications of PET is implementing it for in-beam PET, which is an in situ monitoring method for charged particle therapy. For this purpose, we have previously proposed two geometries for our original open-type PET scanners named OpenPET. Following our initial proposal of the dual-ring OpenPET (DROP) in 2008, we developed a whole-body prototype of DROP (WBDROP) in 2014 to show...
Pixelated direct-conversion detectors are poised to replace scintillators in single photon emission computed tomography (SPECT) cameras with pixel-matching parallel-hole collimators, to compensate for lost resolution while yielding higher sensitivity. However, smaller pixel sizes to improve resolution leads to increased inter-crystal signal sharing, resulting in a drop in sensitivity. It is, therefore,...
A front-end channel prototype for pixel detectors has been designed for the upgrades of the HL-LHC experiments. The circuit is based on a Krummenacher feedback network to continuously reset the charge sensitive amplifier and on a fast threshold discriminator to implement a time-over-threshold (ToT) method and perform amplitude measurement. The circuit was developed in a 65 nm CMOS technology and takes...
Microstructured semiconductor neutron detectors (MSNDs) represent a compact, low-cost, high-efficiency means of solid-state thermal neutron detection. Trenches are etched into a 1-cm2 or 4-cm2 active area pn-junction diode and backfilled with 6LiF neutron converting material. Charged-particle reaction products produced from neutron capture within the conversion material can be measured to indicate...
SPECT is primarily used in the clinic for noninvasive cardiac myocardial perfusion imaging. However, sensitivity is impaired due to the need for collimation in SPECT. New second generation systems including those with multi-pinhole collimation has shown high sensitive acquisitions. This has enabled faster or lower dose “stress-first” acquisitions, but not both. Here a third generation dedicated Cardiac...
Performance measurements were conducted on a prototype PET/CT system under development by GE Healthcare. Performance measurements of spatial resolution, sensitivity, image quality, scatter fraction and count rate were obtained using NEMA NU2-2012 methodology. Timing and energy resolution were also measured. The radial and tangential transaxial and axial resolutions measured from FBP reconstructed...
A “Dichotomous-3D” DOI PET detector design approach is proposed. The approach can potentially reduce the production cost of incorporating Depth-of-Interaction (DOI) in PET systems because the photo-sensors usage and electronic complexity would be even less than that of the current non-DOI PET detectors. The “Dichotomous-3D” approach can be implemented in two ways: (a) the Dichotomous-Offset-Quadrant-Sharing...
iQID (intensified quantum imaging detector) is a novel CCD/CMOS-based ultra-high-resolution photon-counting gamma-ray and x-ray detector technology recently developed at the Center for Gamma-Ray Imaging (CGRI) at the University of Arizona. In this work, we report further advances in iQID's capabilities in terms of dark-noise suppression, sensitivity and field of view (FOV). A new frame-parsing algorithm...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.