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

共 516 条记录，以下是301-310 订阅

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Influence of TOF information in OpenPET image reconstruction

Influence of TOF information in OpenPET image reconstruction

引用

IEEE Symposium on Nuclear Science (NSS/MIC)

作者： Taiga Yamaya Eiji Yoshida Fumihiko Nishikido Naoko Inadama Kengo Shibuya Hideo Murayama Molecular Imaging Center National Institute for Radiological Sciences Chiba Japan Graduate School of Arts and Sciences University of Tokyo Tokyo Japan

We have proposed an ¿OpenPET¿ geometry, which consists of two axially separated detector rings. The central point of the field of view, where the highest sensitivity is obtained, is opened. The OpenPET mainly has three applications, namely, simultaneous PET/CT, extension of the axial FOV, and in-beam PET. In our previous report, we showed that axial spatial resolution, which is degraded with the extended gap due to the parallax error, can be recovered by use of depth-of-interaction (DOI) detectors. On the other hand, image reconstruction of the OpenPET is an incomplete problem because projection data do not satisfy Orlov's condition. Low-frequency components are missing in oblique LORs, i.e., LORs with large ring differences. The gap would suffer from loss of low-frequency components because the gap, where direct LORs (i.e., LORs in the same ring) do not exist, is imaged only from the oblique LORs. In this paper, we focused on time-of-flight (TOF) information, which is expected to compensate for the loss of low-frequency components in the gap. We investigated influence of TOF information in the OpenPET image reconstruction through numerical simulations. Simulated OpenPET scanner had dual detector rings (827.0 mm in diameter and axial length of 153.6 mm each) separated by a gap of 153.6 mm. We supposed that the detectors had a DOI capability of 8 layers and had a TOF capability of 400 ps FWHM resolution. For the non-TOF case, hot-spot objects, which are commonly seen in cancer diagnosis with use of FDG, were imaged without any artifacts, but objects containing more low-frequency components suffered from strong distortion. However, these artifacts were effectively reduced by using TOF information. These results showed that TOF information can compensate for low-frequency components missing in the gap.

关键词： image reconstruction Detectors Positron emission tomography Cancer Computed tomography Spatial resolution Degradation Numerical simulation Geometry Nuclear and plasma sciences

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Research on improved image reconstruction algorithms of OCT based on incomplete projection data - art. no. 68321H

Research on improved image reconstruction algorithms of OCT ...

引用

conference on Holography and Diffractive Optics III

作者： Tang, Xiaochun Gao, Yiqing Nanchang Hangkong Univ Minist Educ China Key Lab Nondestruct Test Nanchang 330063 Jiangxi Peoples R China

ISBN: (纸本)9780819470072

In order to improve the quality and solve the problem of low speed of image reconstruction in the traditional optical computerized tomography (OCT) when the data acquired is incomplete projection, the multiple constrained of genetic algorithm based on algebraic iterative was proposed. Generally speaking, under the condition of multiple-objective optimization, the common extreme point for all the objective functions doesn't exist. So we can achieve the preferable compromise in the contradictions of multiple objectives. In this article, there are three constrained conditions. The first one is the maximum entropy criterion which is used mostly to solve the problem of OCT image reconstruction when the data acquired is incomplete projection recently. The second one is the minimum criteria of peak value which is introduced to suppress noise effectively and ensure the gliding property of the image reconstruction, because of the first one leading to noise amplification during the iterative process. The last constrained condition is the minimum criteria of the difference between the projection again of image reconstruction and the original projection. The concept of penalize-function is introduced into the genetic algorithm, which would transform the constrained optimization problem to unconstrained. It is clearly demonstrated from the experiment results that the algorithm reconstruction technique can efficiently improve the quality of images reconstruction of the incomplete projection data.

关键词： incomplete projection data image reconstruction multiple constrained genetic algorithm

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image reconstruction by Phase Retrieval with Transverse Translation Diversity

Image Reconstruction by Phase Retrieval with Transverse Tran...

引用

conference on image reconstruction from incomplete data V

作者： Guizar-Sicairos, Manuel Fienup, James R. Univ Rochester Inst Opt Rochester NY 14627 USA

ISBN: (纸本)9780819472960

Measuring a series of far-field intensity patterns from an object, taken after a, transverse translation of the object with respect to a known illumination pattern, has been shown to make the problem of image reconstruction by phase retrieval much more robust. However, previously reported reconstruction algorithms [Phys. Rev. Lett. 93, 023903 (2004)] rely oil an accurate knowledge of the translations and illumination pattern for a successful reconstruction. We developed a nonlinear optimization algorithm that allows optimization over the translations and illumination pattern, dramatically improving the reconstructions if the system parameters are inaccurately known [Opt. Express 16, 7264 (2008)]. In this paper we compare reconstructions obtained with these algorithms under realistic experimental scenarios.

关键词： Phase retrieval image reconstruction techniques inverse scattering coherent x-ray imaging

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Exploiting image sparsity in parallel magnetic resonance imaging (pMRI)

Exploiting image sparsity in parallel magnetic resonance ima...

引用

conference on image reconstruction from incomplete data V

作者： Wu, Bing Millane, R. P. Watts, Richard Bones, Philip J. Univ Canterbury Dept Elect & Comp Engn Computat Imaging Grp Christchurch 1 New Zealand Univ Canterbury Dept Phys & Astron Christchurch New Zealand

A hybrid method is presented which allows the acceleration of parallel MR imaging through combining the ideas of compressed sensing with inversion of the imaging matrix. A novel data reordering is employed to enhance ... 详细信息

ISBN: (纸本)9780819472960

关键词： Fourier transforms image restoration Magnetic resonance imaging Computer programming Compressed sensing Receivers Signal processing data acquisition Atrial fibrillation Chemical elements

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image reconstruction in electron microscopy

Image reconstruction in electron microscopy

引用

conference on image reconstruction from incomplete data V

作者： Zheng, Yili Lee, Seunghee Doerschuk, Peter C. Purdue Univ W Lafayette IN 47907 USA

ISBN: (纸本)9780819472960

Maximum likelihood statistical algorithms are described for estimating the 3-D variation of the electron scattering intensity of biological objects from cryo electron microscopy images of multiple instances of the object. Three virus objects, two spherical and one helical, are considered. Solution of the maximum likelihood problem by expectation maximization algorithms or by direct maximization of the log likelihood requires large scale computing and end-to-end codesign of biological problem formulation, statistical models, algorithms, and software design and implementation have contributed to achieving practical results.

关键词： Cryo electron microscopy cryo EM heterogeneous spherical virus homogeneous spherical virus helical virus maximum likelihood statistical reconstruction 3-D reconstruction tomography nonlinear reconstruction expectation maximization algorithm

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Evaluation of Surrogate data Quality in Sinogram-Based CT Metal-Artifact Reduction

Evaluation of Surrogate Data Quality in Sinogram-Based CT Me...

引用

conference on image reconstruction from incomplete data V

作者： Oehler, May Kratz, Baerbel Knopp, Tobias Mueller, Jan Buzug, Thorsten M. Univ Lubeck Inst Med Engn D-23538 Lubeck Germany

ISBN: (纸本)9780819472960

In this work different surrogate data strategies to reduce metal artifacts in reconstructed CT images are tested. Inconsistent sinogram projection data caused by e.g. beam hardening are the origin of metal artifacts in the reconstructed images. The goal of this work is to replace this inconsistent projection data by artificially generated data. Therefore, here, two I D interpolation strategies, a directional interpolation based upon the sinogram 'flow' and a I D interpolation by means of the non-equispaced fast Fourier transform are compared to a fully 2D method based upon the idea of image inpainting. Due to the fact that the artificially generated data never perfectly fit the gap inside the projection data caused by the inconsistencies, those repaired sinogram data are reconstructed using a weighted Maximum Likelihood Expectation Maximization algorithm called lambda-MLEM algorithm. In this way, the artificially generated data, still contaminated with residual inconsistencies, are weighted less during reconstruction.

关键词： Metal artifact reduction MLEM reconstruction image inpainting non-equispaced fast Fourier transformation computed tomography surrogate data strategy

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Robust statistical extension to TRELLIS motion correction in MRI

Robust statistical extension to TRELLIS motion correction in...

引用

conference on image reconstruction from incomplete data V

作者： Bones, Philip J. Maclaren, Julian R. Univ Canterbury Dept Elect & Comp Engn Computat Imaging Grp Christchurch 1 New Zealand Univ Hosp Med Phys Dept Diagnost Radiol Freiburg Germany

ISBN: (纸本)9780819472960

Bulk motion occurring during the acquisition of data in magnetic resonance imaging (MRI) causes serious artifacts in the reconstructed images. The paper presents an extension to TRELLIS, a recently developed method of detecting and correcting for bulk motion. While TRELLIS detects and corrects for bulk translation and rotation. only rotation is considered here. Accurate determination of the relative orientations of overlapping strips of k-space is demonstrated using a robust statistical approach to aid least squares estimation. reconstructions for both simulated and actual MRI acquisitions are presented.

关键词： Magnetic resonance imaging Signal to noise ratio data acquisition Motion estimation Statistical analysis image restoration reconstruction algorithms Computer simulations Error analysis Fourier transforms

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Turbulence Profiling for Long Range Surveillance Imaging

Turbulence Profiling for Long Range Surveillance Imaging

引用

conference on image reconstruction from incomplete data V

作者： Lambert, Andrew Fraser, Donald Bowman, David Brandon, Shane Davies, John Australian Def Force Acad Univ New S Wales Sch Informat Technol & Elect Engn Canberra ACT 2600 Australia

ISBN: (纸本)9780819472960

We report a test of the turbulence found in real-world, horizontal imaging under high magnification. The experiment creates a double "star" on a test chart for use both with a SLODAR turbulence profiling instrument, and simultaneously imaged using a very fast camera to determine traditional seeing parameters. Effects on a similarly located image are investigated to determine the observed effects on the imagery as a function of turbulence location.

关键词： image restoration turbulence profiling surveillance imaging SLODAR

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Iterative projection algorithms for reconstructing compact binary images

Iterative projection algorithms for reconstructing compact b...

引用

conference on image reconstruction from incomplete data V

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

ISBN: (纸本)9780819472960

An algorithm is described for reconstructing compact binary images from limited Fourier amplitude data. This problem arises in macromolecular crystallography where one wishes to reconstruct the molecular envelope from crystal x-ray diffraction amplitudes using a solvent contrast series. Such data are the amplitude of the Fourier transform of all object that has a constant electron density within the boundary of the molecule and zero outside. The image is thus binary and compact, but, the data are available only within a limited resolution range in Fourier space and are undersampled. The problem is solved Using all iterative projection algorithm;a class of algorithm used to solve inverse problems for which the solution is subject to a, number of constraints that, represent a priori information and the data. Unfortunately, these algorithms experience convergence difficulties if one or more of the constraints are non-convex, which is the case for all the constraint's in this problem. We solve the problem by constructing appropriate projection operators and implementing the difference map projection algorithm. Simulations axe used to study convergence behaviour of the algorithm.

关键词： Phase retrieval image reconstruction Iterative Projection Algorithms X-ray crystallography

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Processing of the Astronomical image data obtained from UWFC Optical Systems

Processing of the Astronomical Image Data obtained from UWFC...

引用

conference on image reconstruction from incomplete data V

作者： Rerabek, Martin Pata, Petr Koten, Pavel Czech Tech Univ Fac Elect Engn Dept Radioelect Tech 2 Prague 16627 6 Czech Republic Acad Sci Czech Republ Astron Inst Dept Interplanetary Matter Ondrejov 25165 Czech Republic

ISBN: (纸本)9780819472960

This paper deals with simulation and modeling of the optical systems used in astronomy and their transfer characteristics. It is especially focused to the WFC (Wide-Field Camera) and UWFC (Ultra Wide-Field Camera) SV (Space Variant) optical systems. The properties of UWFC astronomical systems along with specific visual data in astronomical images contribute to complicated evaluation of acquired image data. There is an experiment for estimate the optical aberration of optical systems described in this paper. The results of different deconvolution algorithms, which are used with partially variant model of UWFC optical system, are demonstrated in this paper.

关键词： image processing PSF Zernike polynomial Optical aberration Space variant Deconvolution algorithm

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