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检索条件"任意字段=Conference on Image Reconstruction from Incomplete Data VIII"

共 419 条记录，以下是211-220 订阅

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image reconstruction using symmetry

Image reconstruction using symmetry

引用

conference on image reconstruction from incomplete data VI

作者： Lo, V. L. Millane, R. P. Univ Canterbury Dept Elect & Comp Engn Computat Imaging Grp Christchurch 1 New Zealand

ISBN: (纸本)9780819482969

Symmetry provides a source of redundancy which can be exploited in image reconstruction. In particular, internal symmetries in molecules can help to compensate for the loss of Fourier phase information in macromolecular x-ray crystallography. Symmetry projections are incorporated into iterative projection algorithms for reconstruction of macromolecular electron densities from x-ray diffraction amplitudes from crystals. The effects of interpolation are studied and the algorithms are applied to reconstruction of an icosahedral virus.

关键词： image reconstruction symmetry x-ray crystallography phase retrieval

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Continuous Surface Fitting to Spatial Optical Interferometer data

Continuous Surface Fitting to Spatial Optical Interferometer...

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conference on image reconstruction from incomplete data VI

作者： Rasheed, Sarbast Hajian, Arsen R. Tycner, Christopher Vu, Linda Univ Waterloo Dept Syst Design Engn Waterloo ON N2L 3G1 Canada Cent Michigan Univ Dept Phys Mt Pleasant MI 48859 USA

ISBN: (纸本)9780819482969

In this paper, we describe a practical implementation of an image reconstruction method designed to generate a map of the brightness distribution from data consisting of squared visibilities and complex closure amplitudes resulting from observations of an astronomical target with a broadband, multichannel, spatial optical interferometer. Given the data, the method estimates the true brightness distribution with a model sampled on a rectangular grid of discrete positions on the sky with the assumption that the model intensities in the region not defined by the discrete positions being described by bilinear interpolation of the discrete intensities. The developed image reconstruction method has been applied to real observational data obtained from existing optical interferometer facilities.

关键词： image reconstruction modelling optical interferometry optimization

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3-D signal reconstruction from noisy projection data for stochastic objects as a generalization of Gaussian mixture parameter estimation

3-D signal reconstruction from noisy projection data for sto...

引用

conference on image reconstruction from incomplete data VI

作者： Zheng, Yili Doerschuk, Peter C. Univ Calif Berkeley Lawrence Berkeley Lab Computat Res Div Berkeley CA 94720 USA

A statistical estimation problem for determining 3-D reconstructions from a single 2-D projection image of each of multiple objects when the objects are heterogeneous is described. The method is based on a Gaussian mi... 详细信息

ISBN: (纸本)9780819482969

关键词： statistical inverse problem statistical signal reconstruction tomography cryo electron microscopy virus structure

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Investigation of limited-view image reconstruction in optoacoustic tomography employing a priori structural information

Investigation of limited-view image reconstruction in optoac...

引用

conference on image reconstruction from incomplete data VI

作者： Huang, Chao Oraevsky, Alexander A. Anastasio, Mark A. IIT Med Imaging Res Ctr Dept Biomed Engn Chicago IL 60616 USA TomoWave Labs Houston TX 77057 USA

ISBN: (纸本)9780819482969

Optoacoustic tomography (OAT) is an emerging ultrasound-mediated biophotonic imaging modality that has exciting potential for many biomedical imaging applications. There is great interest in conducting B-mode ultrasound and OAT imaging studies for breast cancer detection using a common transducer. In this situation, the range of tomographic view angles is limited, which can result in distortions in the reconstructed OAT image if conventional reconstruction algorithms are applied to limited-view measurement data. In this work, we investigate an image reconstruction method that utilizes information regarding target boundaries to improve the quality of the reconstructed OAT images. This is accomplished by developing boundary-constrained image reconstruction algorithm for OAT based on Bayesian image reconstruction theory. The computer-simulation studies demonstrate that the Bayesian approach can effectively reduce the artifact and noise levels and preserve the edges in reconstructed limited-view OAT images as compared to those produced by a conventional OAT reconstruction algorithm.

关键词： optoacoustic tomography photoacoustic tomography limited-view tomography Bayesian image reconstruction

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Sampling rates and image reconstruction from scattered fields

Sampling rates and image reconstruction from scattered field...

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conference on image reconstruction from incomplete data VI

作者： Shahid, Umer Fiddy, Michael A. Testorf, Markus E. Univ N Carolina Ctr Optoelect & Opt Commun 9201 Univ City Blvd Charlotte NC 28223 USA Dartmouth Coll Hanover NH 03755 USA

ISBN: (纸本)9780819482969

Cepstral filtering is reviewed as a suitable and efficient method to solve the inverse scattering problem in the case of strongly scattering permittivity distributions. The number and distribution of measured scattered field data required is discussed, as is the effective number of degrees of freedom available to describe the scattering structure. The latter is identified as a key parameter determining the performance of the cepstral method. This is of particular importance for strong scattering and nonlinear image processing methods since many data sets are compiled based on the sampling requirements of weakly scattering objects. We find that the domain of the object support and the maximum permittivity contrast are important prior information for determining the minimum number of data samples necessary while maximizing use of the available degrees of freedom;examples are presented.

关键词： Inverse Scattering Diffraction Tomography Sampling image reconstruction Born Approximation Strong Scattering

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In situ determination of wind fields from sailplane flight data

In situ determination of wind fields from sailplane flight d...

引用

conference on image reconstruction from incomplete data VI

作者： Zhang, Ni Millane, Rick P. Hunter, Alan J. Univ Canterbury Dept Elect & Comp Engn Christchurch 1 New Zealand Univ Bristol Dept Engn Mech Bristol Avon England

ISBN: (纸本)9780819482969

The problem of estimating the wind velocity from measurement of limited flight data from a sailplane flight in atmospheric mountain waves is considered. Sailplanes are often equipped with a flight recorder that records position, and sometimes other information, at regular intervals during the flight. These data contain information on the state of the atmosphere during the flight. A maximum likelihood method is developed for estimating wind fields using such sailplane flight data. The methods are evaluated by application to simulated flight data.

关键词： Maximum likelihood wind velocity aircraft sailplane

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A layered media approach to photoacoustic tomography

A layered media approach to photoacoustic tomography

引用

conference on image reconstruction from incomplete data VI

作者： Schoonover, Robert W. Anastasio, Mark A. IIT Pritzker Inst Biomed Engn & Sci Med Imaging Res Ctr Chicago IL 60616 USA

ISBN: (纸本)9780819482969

Photoacoustic tomography is a rapidly emerging imaging technique that can benefit a wide range of biomedical applications. In this method, illumination of an object with a pulsed optical field induces an acoustic pressure wave related to the heating of the object (optical absorption). from knowledge of the resultant pressure wave measured in a region away from the acoustic source, the object's spatially varying optical absorption properties are estimated by use of an image reconstruction algorithm. Most existing analytic reconstruction algorithms for photoacoustic tomography assume the object of interest possesses homogeneous acoustic properties. In this work, photoacoustic tomography is considered in the case that the primary acoustic source is embedded in a planar layered medium whose speed of sound and densities are known. Exact propagation models valid for acoustic wave propagation in dispersive and absorptive layered media are presented that account for multiple reflections between the layers. Using the angular spectrum method, an inversion model is presented for acoustic data acquired on a plane parallel to the layered medium. The acquired data are shown to be simple linear combinations of plane waves generated at the source.

关键词： photoacoustic tomography image reconstruction

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Reconstructing MR images from under- or unevenly-sampled k-space

Reconstructing MR images from under- or unevenly-sampled k-s...

引用

conference on image reconstruction from incomplete data VI

作者： Vu, Linda Hajian, Arsen R. Calamai, Paul H. Cenko, Andrew T. Rasheed, Sarbast Kim, Jae K. Piron, Cameron So, Simon S. Meade, Jeff T. Knuth, Kevin H. Univ Waterloo Dept Syst Design Engn 200 Univ Ave W Waterloo ON N2L 3G1 Canada Thunder Bay Reg Res Inst Thunder Bay ON Canada Sentinelle Med Inc Toronto ON Canada SUNY Albany Albany NY 12222 USA

ISBN: (纸本)9780819482969

In MRI, non-rectilinear sampling trajectories are applied in k-space to enable faster imaging. Traditional image reconstruction methods such as a fast Fourier transform (FFT) can not process datasets sampled in non-rectilinear forms (e. g., radial, spiral, random, etc.) and more advanced algorithms are required. The Fourier reduction of optical interferometer data (FROID) algorithm is a novel image reconstruction method(1-3) proven to be successful in reconstructing spectra from sparsely and unevenly sampled astronomical interferometer data. The framework presented allows a priori information, such as the locations of the sampled points, to be incorporated into the reconstruction of images. In this paper, the FROID algorithm has been adapted and implemented to reconstruct magnetic resonance (MR) images from data acquired in k-space where the sampling positions are known. Also, simulated data, including randomly sampled data, are tested and analyzed.

关键词： Random sampling MRI image reconstruction interpolation Fourier transform least squares fit

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Three-dimensional image visualization by maximum a posteriori estimation photon-counting integral imaging

Three-dimensional image visualization by maximum a posterior...

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conference on image reconstruction from incomplete data VI

作者： Do, Cuong Manh Univ Connecticut Dept Elect & Comp Engn Storrs CT 06269 USA

ISBN: (纸本)9780819482969

The author presents the maximum a posteriori (MAP) estimation method to estimate irradiance elemental images and reconstruct 3D images using photon-counting integral imaging. Elemental images are captured using the synthetic aperture integral imaging (SAII) technique. Photon-counting elemental images are generated using the Poisson distribution. The method can reconstruct 3D images more accurately than the one using maximum likelihood (MLE) estimation. This may be important in medical imaging as well as other photon-level applications.

关键词： Integral images photon-counting reconstruction maximum likelihood maximum a posteriori

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Understanding stochastic biological macromolecular complexes by estimating a mechanical model via statistical mechanics from cryo electron microscopy images

Understanding stochastic biological macromolecular complexes...

引用

conference on image reconstruction from incomplete data VI

作者： Wang, Kang Doerschuk, Peter C. Cornell Univ Ithaca NY 14853 USA

ISBN: (纸本)9780819482969

Cryo electron microscopy imaging experiments can lead to stochastic models for biological macromolecular complexes. However, interpreting the statistical variability is difficult. In some situations, the variability in the original complexes is due to primarily thermal fluctuations which are snap frozen in place by the preparation of the specimen. In this case the images are images of samples of the equilibrium statistical mechanics ensemble of the complex. Based on representing the complex by a lattice spring-mass mechanical model, an estimation problem for determining the masses and spring constants is described and demonstrated on synthetic data.

关键词： equilibrium statistical mechanics 3-D image understanding cryo electron microscopy virus structure

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