Introduction SPECT projections are contaminated by scatter radiation, resulting in reduced image contrast and quantitative errors. Backscatter constitutes a major part of the scatter contamination in lower energy windows. The current study is an evaluation of the effect of backscatter material on FWHM and image quality investigated by Monte Carlo simulation. Materials and Methods SIMIND program...

Historically, data visualization has been limited primarily to two dimensions (e.g., histograms or scatter plots). Available software packages (e.g., Data Desk 6.1, MatLab 6.1, SAS-JMP 4.04, SPSS 10.0) are capable of producing three-dimensional scatter plots with (varying degrees of) user interactivity. We constructed our own data visualization application with the Visualization Toolkit (Schroe...

The serum proteins and glycoproteins in 73 males were investigated with the object of deciding which tests differentiated most clearly between "pure" silicosis and silico-tuberculosis. None of the tests was entirely satisfactory as, although significant differences between the averages for the various groups were found, the scatter of the individual results was so wide that the tests were not c...

Polycapillary x-ray optics provide an innovative new way to control x-ray beams. Placing these optics after the object to be imaged provides very efficient rejection of Compton scatter, while allowing image magnification without loss of resolution, image demagnification, or image shaping to match with digital detectors. An extensive study of the effects of surface and profile defects have great...

Recent vector supercomputers provide vector memory access to "randomly" indexed vectors, whereas early vector supercomputers required contiguously or regularly indexed vectors. This additional capability, known as "hardware gather/scatter," can be used to great effect in general sparse Gaussian elimination. In this note we present some examples that show the impact of this change in hardware on...

International Symposium on Digital Industrial Radiology and Computed Tomography Ghent, Belgium June 22-25, 2015 SKS deconvolution method corrects scatter per projection by convoluting the measured signal with the pencil beam kernels using equation (1), simulated by varying thickness of the slabs of same material as the object in the CIVA [2] RT module developed for NDT simulations by CEA. The w...

When a macroscopic-sized noncrystalline sample is illuminated using coherent x-ray radiation, bifurcation of photon energy flow may occur. The coarse-grained complex refractive index the be considered to attenuate and refract incident beam, leading component transmitted beam. Spatially unresolved microstructure, associated with fine-grained components index, introduces diffuse This photon-scatt...

We have investigated psychophysically determined image correspondences between pairs of photographs of a single three-dimensional (3-D) object in various poses. These correspondences were obtained by presenting the pictures simultaneously, side by side, and letting the subject match a marker in one picture with a marker (under manual control) in the other picture. Between poses, the object was ...