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.
In PET systems with a geometry different from a closed ring, the Time of Flight (TOF) of the annihilation photons appears to be relevant. Such a system capability helps to compensate the missing angular information that generates artifacts on the reconstructed images. In this work, two ASIC designs are evaluated for their use in PET systems having accurate coincidence resolving times (CRT) while preserving...
In PET detectors based in monolithic scintillators the interaction coordinates of each photon impact, in particular the 511 keV energy, can be determined from the light distribution sampled at the photosensors pixels. However, some of these distributions can be produced by pure dark noise from the SiPM photosensor, multi-interaction events with long travelled distance, pile-up, etc. Early rejection...
A series of small size 22Na point sources have been simulated using GATE, following the NEMA protocol, and applied to the geometry of a brain dedicated PET so-called MindView. The simulated scanner geometry is currently composed by one ring of 20 detector blocks with a distance of about 330 mm between opposite detectors. Each detector module includes a monolithic LYSO crystal of 50 × 50 × 20 mm3 and...
A whole-body PET device is sometimes not suitable for brain studies because the achieved image resolution is typically not sufficient to investigate small size structures. Thus, a dedicated brain PET insert system with high performance would overcome such limitations. Moreover, these functional studies lack of anatomical information. It is shown elsewhere the convenience of simultaneously acquisition...
We designed a novel PET insert based on monolithic LYSO crystals. From our first evaluation, we can conclude that sub-millimeter detector spatial resolution, combined with accurate photon DOI determination, make it possible to acquire high resolution reconstructed images. This enables us to combine simultaneously high resolution and sensitivity PET with high field preclinical MRI to extract simultaneously...
This works shows the feasibility study performed with a new small animal PET design based on SiPM arrays in front of a high field MR scanner. The PET ring is made out of 8 detector blocks each containing a single monolithic 50×50×10 mm3 LYSO block and coupled to an array of 12×12 SiPMs. The PET system performance has been evaluated both alone and in front of the MR with about 400–500 mT magnetic field...
A new design of the small animal PET Albira system which detectors are based on arrays of SiPMs and monolithic LYSO scintillator is presented here. The system is made out of 3 rings of 8 detectors each, resulting on an axial and transaxial FOVs of 148 and 80 mm, respectively. The scanner is thermally stabilized using air-cooling. Working temperatures around 22–25°C are reached with individual detector...
We report two approaches for a high-resolution, position sensitive, gamma ray detector, based on solid estate photosensors and scintillation crystals. Scintillation photons are detected with a custom-made array of 144 SiPMs (12×12) covering an area of 5×5cm2. Individual SiPM signals are processed with 3 multiplexing ASICs. The performance of such assemble has been compared with a standard array of...
The Multimodal Imaging of Neurological Disorders (MINDview) project aims to develop a high resolution and sensitivity dedicated brain Positron Emission Tomography (PET) system capable of visualizing neurotransmitter pathways and their disruptions for mental disorders for diagnosis and treatment follow-up. Moreover, this compact PET system should be fully compatible with a Magnetic Resonance Imaging...
In Positron Emission Tomography (PET) detectors based in monolithic scintillators, the spatial resolution is limited by the accuracy in the determination of the interaction coordinates from the 511 keV photons. When linear algorithms, such as Center of Gravity (CoG) are used a poor estimation of the interaction positions, specially towards the edges is the major limitation in spatial resolution. A...
Gamma ray detectors merging continuous and pixelated crystal arrays are described. We show a pilot study about the detector performance of an innovative scintillation design that simultaneously uses both a continuous and a crystal array. This novel idea is the base of a high-resolution and high-sensitivity gamma ray detector. Alternatively monolithic or crystal arrays can be mounted on the front or...
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.