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.
A maneuverable laboratory device, developed to evaluate the compatibility of a gamma ray detector and MRI magnetic gradients, is presented The tool was designed to characterize the sensitivity to switching gradients of the detector modules of INSERT, a clinical SPECT ring compatible with commercial MRI scanners. The time-varying magnetic fields generated with this tool can be tailored to be identical...
In this work we present the study and the experimental results on two different front-end stages for the MiniSDD pixel sensors of the DSSC detector for photon science applications at the European XFEL GmbH in Hamburg. The detector must be able to cope with an image frame rate up to 4.5 MHz and must achieve a dynamic range up to 104 photons/pixel/pulse with a photon energy of 1 keV. In order to achieve...
We report on the results achieved with the first SPECT insert for general purpose MR scanners, developed within the INSERT project (INtegrated SPECT/MRI for Enhanced stratification of brain tumors in Radio-chemoTherapy). The present paper focuses on the implementation and performance assessment of a preclinical version of the SPECT. A clinical configuration is currently under development and will...
We present the implementation of a practical iterative method for optical model estimation in Anger cameras for medical imaging. The optical model, also referred to as light response, represents a fundamental requirement for statistical event reconstruction in gamma detectors implementing monolithic scintillators. Despite we considered several approaches for the response calibration, based either...
This work presents the first results of ARDESIA, a novel, SDD-based, multichannel X-ray detector. ARDESIA has been optimized for synchrotron applications which require a high-rate, high-resolution x-ray spectroscopy detector. The main applications here considered are X-Ray Fluorescence (XRF) and X-ray Absorption Fine Structure (XAFS) spectroscopy. The structure of the ARDESIA detector is modular i...
This work presents the first experimental results of SFERA, a multichannel low-noise readout ASIC designed for both X and γ-ray detectors for spectroscopy and imaging applications. The chip has been developed to process signals coming from solid-state detectors and CMOS preamplifiers. The design has been guided by the use of silicon drift detectors (SDDs), although the ASIC may find a wider application...
In this work we present new developments of Silicon Drift Detectors (SDDs) and low noise CMOS read-out electronics for a possible use in different X-ray spectroscopy applications, from nuclear physics experiments, to detection systems at synchrotron light sources, to XRF (X-Ray Fluorescence) instrumentation. The detectors can be operated in different working conditions, from room temperature, avoiding...
Proton Therapy treatments are affected by uncertainties on the penetration depth of the beam within the patient. For this reason, real-time range control is highly desirable to deliver safer treatments. Real-time range control can be performed by imaging prompt gammas emitted along the proton tracks in the patient. Our approach uses a knife-edge slit collimator to obtain a 1-dimensional projection...
We propose a new compact SiPM array designed and optimized for low energies (e.g. 140 keV) and multi-tracers gamma rays detection. The final purpose of the array is to populate MR compatible SPECT systems. Coupled to a 4 mm thick CsI(Tl) scintillator, the SiPM array presents a Field of View (FOV) of 25 mm × 25 mm, an Usefull Field of View (UFOV) of 20 mm × 20 mm and an intrinsic spatial resolution...
In this work we propose a gamma detector based on Silicon Drift Detectors to readout a 1″×1″ LaBr3:Ce scintillator for gamma-ray spectroscopy and imaging application. Position sensitivity could be useful in nuclear physics research to limit the worsening effect of Doppler broadening in gamma-ray spectroscopy at relativistic velocities. The main difficulty in determining the position of the gamma-ray...
In this work we present new developments of Silicon Drift Detectors (SDDs) of different sizes in view of their use in future Siddharta-2 experiments. The SIDDHARTA experiment used X-ray spectroscopy of the kaonic atoms to determine the transition yields and the strong interaction induced shift and width at the lowest experimentally accessible level. In this work we report about the SDDs development...
The availability of high-intensity and high repetition rate X-ray sources, like XFEL facilities, impose severe constraints for the detectors to be developed, in terms of high speed and high dynamic range. For the European XFEL, different detector developments are on the way to readout X-ray flashes with a repetition rate of 4.5MHz with a dynamic range up to 104. In this framework, different compression...
Treatments delivered by proton therapy are affected by uncertainties on the range of the beam within the patient. To reduce these margins and improve feedback on treatment delivery, different projects are investigating real-time range control by imaging prompt gammas emitted along the proton tracks in the patient. This study supports the development of a prompt gamma camera using a knife-edge slit...
In this work, we present the design and the results of the analog channel of the readout circuit for the outer layers of SuperB Silicon Vertex Tracker (SVT). In these layers, the strip detectors have a very high stray capacitance and high series resistance. Therefore, the noise optimization was the first priority design concern. To fulfill the noise level and efficiency requirements, a compromise...
A new multi-modality imaging tool is under development in the framework of the INSERT (INtegrated SPECT/MRI for Enhanced Stratification in Radio-chemoTherapy) project, supported by the European Community. A custom SPECT apparatus, used as an insert for commercially available MRI systems, will enhance the treatment of brain tumors (primarily glioma) by offering more effective and earlier diagnosis...
Treatments delivered by proton therapy are affected by uncertainties on the range of the beam within the patient. To reduce these margins and deliver safer treatments, different projects are currently investigating real-time range control by imaging prompt gammas emitted along the proton tracks in the patient. This study reports on the development and test of a prompt gamma camera using a slit collimator...
In this paper we present the development of an integrated circuit and of a data acquisition system for the readout of silicon drift detector (SDD) arrays to be coupled to scintillators for gamma-ray spectroscopy in the range 150 kev –15 Mev. The final goal is to develop a spectrometer based on an array of 81 silicon drift detectors (SDDs) coupled to a laBr3:ce scintillator. The SDD photo-detectors...
In order to predict the behavior of a gamma camera based on scintillators, both to optimize its design and performances in the position and energy reconstructions, a new simulation toolset has been developed. It consists of a set of graphic user interfaces written in MATLAB® language, with the purpose of simulating the expected behavior of the gamma rays interactions and optical photons distribution...
In this work, we report on a new development of Silicon Drift Detectors (SDDs) for gamma-ray spectroscopy for astronomy applications, within a research project supported by the European Space Agency. The final goal of the development is the realization of monolithic arrays of SDDs which will be assembled to readout large (2″×2″ and 3″×3″) LaBr3 scintillators. We report on the development of a new...
In this contribution, we present the experimental proof of concept of a fully integrated digital architecture that directly interfaces to detection units and returns data ready for the synthesis of the images. The proposed system is fed by the output of each detector preamplifier and correspondingly calculates energy and occurrence time of events. The convenience of such a choice is self-evident,...
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.