OBJECTIVES We evaluated edge artifacts in relation to phantom diameter and reconstruction parameters in point spread function (PSF)-based positron emission tomography (PET) image reconstruction. METHODS PET data were acquired from an original cone-shaped phantom filled with 18F solution (21.9 kBq/mL) for 10 min using a Biograph mCT scanner. The images were reconstructed using the baseline ord...

In the field of radiation instrumentation, there is a desire to reach sub-10 ps FWHM timing resolution for applications such as time-of-flight positron emission tomography, computed tomography and time-resolved calorimetry. One key parts detection chain these single-photon detector and, in recent years, first avalanche diode (SPAD) with was presented. To resolution, SPAD read out by an operatio...

We present Monte Carlo computational methods for estimating the coincidence resolving time (CRT) of scintillator detector pairs in positron emission tomography (PET) and present results for Lu2SiO5 : Ce (LSO), LaBr3 : Ce, and a hypothetical ultra-fast scintillator with a 1 ns decay time. The calculations were applied to both single-ended and double-ended photodetector readout with constant-frac...

Abstract Optical transition-edge sensors (TESs) have shown an energy resolution for resolving the number of incident photons at telecommunication wavelength. However, a higher is required biological imaging and microscopic spectroscopy. In this study, we tested Au/Ti (10/20 nm) bilayer TES that showed high resolution. The was achieved by lowering critical temperature ...

Evidence of wildfires in deep time is preserved as fossilised charcoal fragments the rock record and inertinite macerals coal. Historically, reflectance has been utilised to assess formation temperature these charcoals, thus burning intensities prehistoric fires. This achieved by quantifying variability a function changes microstructure with temperature. Raman spectroscopy shown similarly carbo...

Abstract Raman spectroscopic analysis was performed on columbite-(Mn) samples from a variety of previously studied rare-element pegmatites in Xinjiang, China, including the Jing'erquan No. 1 spodumene-subtype, Dakalasu beryl–columbite-subtype and Kalu'an spodumene-subtype pegmatites, to quantify relationship between degree metamictisation columbite spectra. For all analysed columbites-(Mn), pos...

This paper reports on the initial analysis of spectral smile calibration Hyperspectral Imager Suite (HISUI) onboard International Space Station, which has been continuously acquiring data since September 4, 2020. HISUI is an optical hyperspectral imager consisting two subsystems: VNIR covering 400 to 980nm at intervals 10 nm, and SWIR 895 2481nm 12.5nm intervals. Based atmospheric correction fo...

background: the advantages of proton beam in radiation therapy- like small lateral scattering as well as absence of exit dose tail in the organs which are after the tumor- make it capable of delivering more treatment doses to the target and much lesser to the critical tissues near it. materials and methods: in this study, the monte carlo mcnpx code has been used to simulate a slab head phantom ...

We investigate the ability of three-integral, axisymmetric, orbit-based modelling algorithms to recover the parameters defining the gravitational potential (mass-to-light ratio Υ and black hole mass M•) in spheroidal stellar systems using stellar kinematical data. We show that the potential estimation problem is generically under-determined: a range of parameters (Υ,M•) can provide equally good...