نتایج جستجو برای: tof pet
تعداد نتایج: 65497 فیلتر نتایج به سال:
Stanford University, Department of Radiology, Division of Nuclear Medicine and Molecular Imaging, USA Recently, a whole-body, simultaneous positron emission tomography magnetic resonance imaging (PET-MRI) system combing MRI with time-of-flight (TOF) PET has been developed. We present our initial experience with human clinical studies using 18Ffluorodeoxyglucase (FDG) with this scanner, in compa...
Abstract Positron emission tomography (PET) is an established medical diagnostic imaging method. Continuous improvements are aimed at refining image reconstruction, reducing the amount of radioactive tracer and combining with targeted therapy. Time-of-flight (TOF)-PET provides localization through improved time resolution, nuclear physics may contribute to this goal via selection nuclei emittin...
Recently introduced combined PET/MR scanners need to handle the specific problem that a limited MR field of view sometimes truncates arm or body contours, which prevents an accurate calculation of PET attenuation correction maps. Such maps of attenuation coefficients over body structures are required for a quantitatively correct PET image reconstruction. This paper addresses this problem by pre...
We discuss computing issues for data analysis and image reconstruction of PET-TOF medical scanner or other medical scanning devices producing large volumes of data. Service architecture based on the grid and cloud concepts for distributed processing is proposed and critically discussed.
Abstract We develop a positronium imaging method for the Jagiellonian PET (J-PET) scanners based on time-of-flight maximum likelihood expectation maximisation (TOF MLEM). The system matrix elements are calculated on-the-fly coincidences comprising two annihilation and one de-excitation photons that originate from ortho-positronium (o-Ps) decay. Using Geant4 library, Monte Carlo simulation was c...
The paper presents “A CMOS Delay Lock Loop with Dual Control”. Positron emission tomography (PET) with time-of-flight (TOF) capability has been shown to provide a better reconstructed image compared to conventional positron tomography. Resolution is the biggest problem in PET. To achieve such resolution, time interpolations and multiphase sampling techniques are the mostly used methods. A preci...
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