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Shape Reconstruction in X-Ray Tomography

by Ali Mohammad-Djafari
"... X-ray tomographic image reconstruction consists in determining an object function from its projections. In many ap- plications such as non destructive testing, we look for a default region (air) in a homogeneous known background (metal). The image reconstruction problem becomes then the determinatio ..."
Abstract - Cited by 5 (1 self) - Add to MetaCart
then the determination of the shape of the default region. Two approaches can bc used: modelling the image as a binary Markov random field and estimating the whole pixels of the image or modeling the shape of the default and estimating it directly from the projections. In this work wc model the default shape by a

Three-dimensional coordinates of individual atoms in materials revealed by electron tomography

by Rui Xu , † , Chien-Chun Chen , Li Wu , M C Scott , W Theis , Colin Ophus , † , Matthias Bartels , Yongsoo Yang , Hadi Ramezani-Dakhel , Michael R Sawaya , Hendrik Heinz , Laurence D Marks , Peter Ercius , Jianwei Miao , Howard
"... Crystallography, the primary method for determining the 3D atomic positions in crystals, has been fundamental to the development of many fields of science 1 . However, the atomic positions obtained from crystallography represent a global average of many unit cells in a crystal In 1959, Richard Fey ..."
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Feynman challenged the electron microscopy community to locate the positions of individual atoms in substances The experiment was performed on an aberration-corrected STEM operated in annular dark-field (ADF) mode • to 180 • , a tilt series of 62 angles was acquired with equal slope increments

Concurrent threads for parallel electron tomography

by J. A. Álvarez, J. Roca, J. J. Fernández - In Proceedings of the 6th WSEAS International Conference on Applied Computer Science (ACS ’06 , 2006
"... Abstract:- High Performance Computing (HPC from now) is a characteristic defined and developed with the aim of providing a feasible framework in which large-scale and grand-challenge applications can be run within acceptable time bounds. Electron tomography of large specimens sets up a field in whic ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
Abstract:- High Performance Computing (HPC from now) is a characteristic defined and developed with the aim of providing a feasible framework in which large-scale and grand-challenge applications can be run within acceptable time bounds. Electron tomography of large specimens sets up a field

Digital Phase Reconstruction via Iterative Solutions of Transport-of-Intensity Equation

by Emmanuel Froustey, Emrah Bostan, Stamatios Lefkimmiatis, Michael Unser
"... Abstract—We develop a variational algorithm for reconstruct-ing phase objects from a series of bright field micrographs. Our mathematical model is based on the transport-of-intensity equation (TIE), which links the phase of a complex field to the axial derivative of its intensity. To reduce reconstr ..."
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Abstract—We develop a variational algorithm for reconstruct-ing phase objects from a series of bright field micrographs. Our mathematical model is based on the transport-of-intensity equation (TIE), which links the phase of a complex field to the axial derivative of its intensity. To reduce

Limitations in 3D reconstruction of X-rays tomography

by J. Otón, R. Marabini, C. O. S. Sorzano, J. M. Carazo, Centro Nacional De Biotecnología, Csic Madrid (spain
"... To reconstruct the 3D information of X-rays tomography (tomoX). many authors [1, 2, 3, 4] uses algorthims implemented for electron microscopy ([5, 6]) To analyze the performance of applying EM reconstruction algorithms to tomoX microscopy we have developed an X-ray microscope simulator. This simulat ..."
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To reconstruct the 3D information of X-rays tomography (tomoX). many authors [1, 2, 3, 4] uses algorthims implemented for electron microscopy ([5, 6]) To analyze the performance of applying EM reconstruction algorithms to tomoX microscopy we have developed an X-ray microscope simulator

Image Reconstruction of Moderate Contrast Targets Using the Distorted Born Iterative Method

by Roberto Lavarello, Michael Oelze
"... Abstract — Ultrasonic tomography using inverse scattering, i.e., the distorted Born iterative method (DBIM), allows for the quantitative image reconstruction of mechanical properties of materials. The use of multi-frequency information has been proposed to avoid convergence issues for targets with m ..."
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Abstract — Ultrasonic tomography using inverse scattering, i.e., the distorted Born iterative method (DBIM), allows for the quantitative image reconstruction of mechanical properties of materials. The use of multi-frequency information has been proposed to avoid convergence issues for targets

Iterative image reconstruction using inverse Fourier rebinning for fully 3-D

by Sanghee Cho, Student Member, Quanzheng Li, Sangtae Ahn, Bing Bai, Richard M. Leahy - PET,” IEEE Trans. Med. Imag , 2007
"... Abstract—We describe a fast forward and back projector pair based on inverse Fourier rebinning for use in iterative image reconstruction for fully 3-D positron emission tomography (PET). The projector pair is used as part of a factored system matrix that takes into account detector-pair response by ..."
Abstract - Cited by 1 (1 self) - Add to MetaCart
Abstract—We describe a fast forward and back projector pair based on inverse Fourier rebinning for use in iterative image reconstruction for fully 3-D positron emission tomography (PET). The projector pair is used as part of a factored system matrix that takes into account detector-pair response

Acoustic Tomography Method for Measuring Temperature and Wind Velocity

by Ivana Jovanović, Luciano Sbaiz, Martin Vetterli - in IEEE Intern. Conf. on Acous., Speech, and Signal Proces , 2006
"... We consider the problem of reconstructing superimposed temperature and wind flow fields from acoustic measurements. A new technique based solely on acoustic waves propagation is presented. In contrast to the usual straight ray assumption, a bent ray model is considered in order to achieve higher acc ..."
Abstract - Cited by 7 (2 self) - Add to MetaCart
We consider the problem of reconstructing superimposed temperature and wind flow fields from acoustic measurements. A new technique based solely on acoustic waves propagation is presented. In contrast to the usual straight ray assumption, a bent ray model is considered in order to achieve higher

Recent Advances in CT Image Reconstruction

by Jiang Hsieh , Brian Nett , • Zhou , Yu , Ken Sauer , Jean-Baptiste Thibault , Charles A Bouman - Current Radiology Reports
"... Abstract Over the past two decades, rapid system and hardware development of x-ray computed tomography (CT) technologies has been accompanied by equally exciting advances in image reconstruction algorithms. The algorithmic development can generally be classified into three major areas: analytical r ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
reconstruction, model-based iterative reconstruction, and application-specific reconstruction. Given the limited scope of this chapter, it is nearly impossible to cover every important development in this field; it is equally difficult to provide sufficient breadth and depth on each selected topic. As a

COMPRESSED SENSING IMAGE RECONSTRUCTION VIA RECURSIVE SPATIALLY ADAPTIVE FILTERING

by Karen Egiazarian, Alessandro Foi, Vladimir Katkovnik
"... We introduce a new approach to image reconstruction from highly incomplete data. The available data are assumed to be a small collection of spectral coefficients of an arbitrary linear transform. This reconstruction problem is the subject of intensive study in the recent field of “compressed sensing ..."
Abstract - Cited by 24 (4 self) - Add to MetaCart
We introduce a new approach to image reconstruction from highly incomplete data. The available data are assumed to be a small collection of spectral coefficients of an arbitrary linear transform. This reconstruction problem is the subject of intensive study in the recent field of “compressed
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