Results 71 to 80 of about 442,874 (245)
Perfusion CT and PET with 18F–FDG and 18F–FCh in the complex diagnosis of hepatocellular carcinoma
European Journal of Hybrid Imaging, 2017 Background The purpose of the study to evaluate possibilities of CT-perfusion and PET methods with 18F–FDG and 18F–fluorocholine in the complex diagnosis of hepatocellular carcinoma.
P. E. Tulin +6 more
doaj +1 more source
Generation of neutral and high-density electron–positron pair plasmas in the laboratory
Nature Communications, 2015 Electron–positron pair plasmas represent a unique state of matter, whereby there exists an intrinsic and complete symmetry between negatively charged (matter) and positively charged (antimatter) particles.
G. Sarri +24 more
semanticscholar +1 more source
Calculating the size of positronium
Известия высших учебных заведений. Поволжский регион: Физико-математические наукиBackground. A fairly common error has been established in the particular case of the problem of two bodies of the same mass performing circular motion around a fixed center of their mass, which consists in the fact that the radius of rotation is found ...
I.P. Popov
doaj +1 more source
Demonstration of a positron beam-driven hollow channel plasma wakefield accelerator
Nature Communications, 2016 Plasma wakefield accelerators have been used to accelerate electron and positron particle beams with gradients that are orders of magnitude larger than those achieved in conventional accelerators. In addition to being accelerated by the plasma wakefield,
S. Gessner +23 more
semanticscholar +1 more source
World Journal of Nuclear Medicine, 2019 Crossed cerebellar diaschisis (CCD) represents the reduction of blood flow, metabolism, and oxygen consumption in the cerebellar hemisphere contralateral to a cerebral focal lesion.
Dimitrios Priftakis +2 more
doaj +1 more source
Ultrafast timing enables reconstruction-free positron emission imaging
Nature Photonics, 2021 S. I. Kwon +9 more
semanticscholar +1 more source
Diagnostic role and prognostic impact of positron emission tomography/computed tomography in patients treated for uterine corpus cancer [PDF]
Srpski Arhiv za Celokupno LekarstvoIntroduction/Objective. The goal of our research was to evaluate diagnostic and prognostic role of positron emission tomography/computed tomography (PET-CT) in patients previously treated for uterine cancer and compare it to conventional imaging methods (
Stojiljković Milica +7 more
doaj +1 more source
On the Positron Theory of Vacuum [PDF]
Progress of Theoretical Physics, 1950 In our previous consideration, the so-called ambiguities of quantum field theory can be removed by the certain general conditions of integrals. These procedures are equivalent with the subtraction theory which subtract the ambiguous terms from the matrix element in question. In this paper, we again examine these subtractions from the slightly different
openaire +2 more sources
Polarization and Forward Scattering Effects in Low Energy Positron Collisions with H2
HydrogenPositron physical-chemistry has been one important focus of scientific investigation of the last decades, however their low energy scattering by atoms and molecules still offers many questions to be answered, as the low angle scattering effects on the ...
Wagner Tenfen +4 more
doaj +1 more source
Физика волновых процессов и радиотехнические системы, 2014 The reasons of angular photon distribution occurrence at electron-positron annihilation are considered. It is shown, that angular photon distribution is consequence of Dopplers effect in the reference frame of the electron and positron mass center.
A.N. Volobuev, T.A. Antipova
doaj