objective: to study the accuracy of spiral tomography in the determination of implant angulation. materials and methods: eighteen gutta-percha filled points on dry mandibles were selected for implant placement. a translucent acrylic template was fabricated for each mandible. after preparing tomographic images (2 mm slice thickness, cranex tome), the ideal axis of the implant was traced. the ang...

We propose a method which utilizes the radiative transfer equation in optical tomography. In this approach, the radiative transfer equation is used as light propagation model in those regions in which the assumptions of the diffusion theory are not valid and the diffusion approximation is used elsewhere. Both the radiative transfer equation and the diffusion approximation are numerically solved...

Methods This paper reports on the reporting quality of cardiac computed tomography (CCT), single positron emission computed tomography (SPECT), and cardiac magnetic resonance (CMR) diagnostic accuracy studies in randomly selected groups of 50: ‘CMR 1995-2002’, ‘CMR 20042011’, ‘CCT f 1995-2002’, and ‘CCT 2004-2011’, ‘SPECT 1995-2002’, ‘SPECT 2004-2011’. These 300 studies were read against the 25...

Spectrally-resolved BioLuminescence optical Tomography (sBLT) is used to recover images of Luciferase activity within a 3D mouse model using multi-wavelength emission data from multiple internal bioluminescence sources. The images show that the location of sources can be reconstructed accurately using a fast, direct and linear reconstruction algorithm. ©2006 Optical Society of America OCIS code...

actual focal spot automatic exposure control comparator coulomb/kilogram detector effective focal spot focal spot blooming grid latitude grid uniformity half-value layer high-frequency homogenous phantom ion chamber kilowatt rating Law of Reciprocity linear tomography line focus principle linearity mobile x-ray generator objective plane photodetector pluridirectional tomography portable x-ray g...

Linear inverse Gaussian problems is traditionally solved using least squares based inversion. The center of the posterior Gaussian probability distribution is often chosen as the solution to such problems, while the solution is in fact the posterior Gaussian probability distribution itself. We present an algorithm, based on direct sequential simulation, which can be used to efficiently draw sam...

background and aims. cone-beam computed tomography (cbct) is an imaging system which has many advantages over computed tomography (ct). in ct scan, hounsfield unit (hu) is proportional to the degree of x-ray attenuation by the tissue. in cbct, the degree of x-ray attenuation is shown by gray scale (voxel value). the aim of the present study was to investigate the relationship between gray scale...

We introduce quantum tomography on locally compact Abelian groups $G$. A linear map from the set of states $C^*$-algebra $A(G)$ generated by projective unitary representation $G$ to space characteristic functions is constructed. The dual determining symbols observables derived. Given a function state tomogram consisting probability distributions introduced. provide three examples in which $G={\...

In this article we provide an accessible account of the essential idea behind cloaking, aimed at nonspecialists and undergraduates who have had some vector calculus, Fourier series, and linear algebra. The goal of cloaking is to render an object invisible to detection from electromagnetic energy by surrounding the object with a specially engineered “metamaterial” that redirects electromagnetic ...