Discrete tomography deals with the reconstruction of images from projections collected along a few given directions. Different approaches can be considered, according to different models. In this paper we adopt the grid model, where pixels are lattice points with integer coordinates, X-rays are discrete lattice lines, and projections are obtained by counting the number of lattice points interce...

| The paper studies the Cram er-Rao (CR) bound for data obtained in emission tomography (ET). In ET the distribution of the data is the combined probability of independent Poisson distributed variables, the expectation of each being a linear function c T i of the vector of parameters. We investigate the achievability of the CR bound, in particular on the boundary of the natural domain of the pr...

We review the papers devoted to solution of reconstruction tomographic problems by using neural networks. Recent developments in the solution of linear and non-linear tomographic problems in various types of tomography are surveyed.

Some acoustical nonlinear effects in biological media at medical ultrasonic frequencies and intensities were studied experimentally. The imaging method of acoustical nonlinearity parameter, as a basic parameter in nonlinear acoustics, was developed and investigated. Results indicate tidt the difference between normal and diseased tissues in nonlinearity parameter tomography is more sensitive th...

conclusions the automatic bolus-tracking method, results in higher contrast enhancement of the aorta and spleen at the portal phase, but has no effect on liver enhancement. however, bolus tracking is associated with reduced variability for liver enhancement among different patients. results forty-eight patients (23 male, 25 female, mean age=56.4±13.5 years) were included. the contrast enhanceme...

objective(s): in this study, we aimed to describe the characteristics of portal vein tumor thrombosis (pvtt), complicating hepatocellular carcinoma (hcc) in contrast-enhanced fdg pet/ct scan. methods: in this retrospective study, 9 hcc patients with fdg-avid pvtt were diagnosed by contrast-enhanced fluorodeoxyglucose positron emission tomography/computed tomography (fdg pet/ct), which is a comb...

<p style='text-indent:20px;'>In this paper, we consider the imaging problem of terahertz (THz) tomography, in particular as it appears non-destructive testing. We derive a nonlinear mathematical model describing full THz tomography experiment, and linear approximations connecting with standard computerized Radon transform. Based on derived models propose different reconstruction approache...