A fully 3D iterative image reconstruction algorithm has been developed for high-resolution PET cameras composed of pixelated scintillator crystal arrays and rotating planar detectors, based on the ordered subsets approach. The associated system matrix is precalculated with Monte Carlo methods that incorporate physical effects not included in analytical models, such as positron range effects and...

Department of Physics of Molecular Imaging Systems, RWTH Aachen University, Germany In this work we present detailed characterizations of our preclinical high resolution PET/ MR insert based on the Hyperion-IID platform. The PET/MR insert consists of a ring of 10 singles detection modules, each comprising 2×3 scintillation detector stacks. Each detector stack features a 30×30 pixelated LYSO cry...

Technological Educational Institute of Athens, Athens, Greece The purpose of this study is to investigate the behavior of the new generation of SensL SiPM arrays, ArrayB and ArrayM, for PET/MR applications. The evaluation of the SiPMs performance underwent with pixelated GaGG and BGO scintillators with 2×2×5 mm pixel size and various coupling schemes for 511keV and 662keV energies. To acquire r...

ConspectusScanning electron nanobeam diffraction, or 4D-STEM (four-dimensional scanning transmission microscopy), is a flexible and powerful approach to elucidate structure from soft materials that are challenging image in the microscope because their easily damaged by beam. In experiment, converged beam scanned across sample, pixelated camera records diffraction pattern at each scan position. ...

in this paper, design and construction of a tactile sensor for measuring contact-force is presented. mechanism of measuring contact-force in this tactile sensor is based on impedance changing of piezoelectric crystal and voltage of different points in circuit as a result of applying force on the crystal. by considering a specific point in the circuit and recording the changes of its voltage, ma...

background: similar to the thermoluminescence (tl) spectra, the optical parameters variations can also be used in tl crystals for dosimetry purposes. these optical parameters can include absorption, transmission and reflection coefficients. materials and methods: single crystals of kbr and kcl which have been used in this research were grown from laboratory grade extra pure precursor powders. c...