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

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Influence of TOF information in OpenPET image reconstruction

Influence of TOF information in OpenPET image reconstruction

引用

IEEE Nuclear Science Symposium conference 2009

作者： Yamaya, Taiga Yoshida, Eiji Nishikido, Fumihiko Inadama, Naoko Shibuya, Kengo Murayarna, Hideo Natl Inst Radiol Sci Mol Imaging Ctr Chiba Japan Univ Tokyo Grad Sch Arts & Sci Tokyo Japan

ISBN: (纸本)9781424439614

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

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2D Line Matching Using Geometric and Intensity data

2D Line Matching Using Geometric and Intensity Data

引用

International conference on Artificial Intelligence and Computational Intelligence

作者： Woo, Dong-Min Park, Dong-Chul Han, Seung-Soo Beack, Seunghwa Myongji Univ Dept Informat Engn Image Proc Lab NPTC Gyeonggido 449728 South Korea

ISBN: (纸本)9780769538167

We present a stereo matching method of 2D line segments for the detection of 3D line segment. Stereo line matching is a difficult task, since it relies on incomplete 2D line data. The proposed matching method is based on geometric and intensity information of 2D line segment. A set of line attributes is used to match a pair of 2D lines. Line attributes consist of intensity information and geometric information including length, orientation, and endpoint position. Multi-threshold technique has been employed in the implementation of the proposed method so that flexible and efficient matching capability can be attained. Aerial and satellite images are used for the experiments of the proposed method. The experimental results indicate that the proposed method generates accurate 3D line segments from aerial and satellite images.

关键词： Antennas

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Two-dimensional region-of-interest reconstruction: Analyzing the difference between virtual fanbeam and DBP-Hilbert reconstructions

Two-dimensional region-of-interest reconstruction: Analyzing...

引用

IEEE Symposium on Nuclear Science (NSS/MIC)

作者： Rolf Clackdoyle Dilip N. Ghosh Roy Michel Defrise Catherine Mennessier Moctar-Salem Ould Mohamed Department of Radiology University of Utah Salt Lake USA Laboratoire Hubert Curien UMR 5516 CNRS Université Jean Monnet Saint Etienne France Division of Nuclear Medicine Free University of Brussels Brussels Belgium

This work addresses theoretical advances classical (2D) tomographic image reconstruction. During the past several years, inversion formulas have been established that allow ROI reconstruction from incomplete (yet sufficient) data. Such reconstructions have important consequences in certain practical situations, such as truncated projections. The precise relationship between the largest ROI that can be reconstructed and the incompleteness of the sinogram is a complex question which has still not been completely answered in the 2D case. These relationships are inherent to the system and have consequences for iterative/statistical reconstruction methods, because they describe which part of the reconstructed image is determined completely by the data; the other parts of the image will have been more heavily influenced by the regularization method or by the nature of the objective function. Our understanding of the nature of reconstruction from incomplete yet sufficient data relies mainly on formulas obtained from the virtual fanbeam (VFB) method and from the DBP-Hilbert method. The purpose of this work is to provide a structure in which to examine the inherent differences in these two approaches. Using a common reconstruction problem, we reformulate VFB and DBP-Hilbert reconstruction formulas into weight functions that are applied in the sense of an inner product to the sinogram. A common regularization is used for the Hilbert transform in both methods. Unlike the usual Fourier windows used in analytic methods, the regularization we used is applied locally to the singularity to avoid the regularization obscuring the nature of the reconstruction. The weight functions clearly show how truncated projections are being correctly handled. The dissimilarity in the weight functions of the two methods illustrates fundamental differences in managing incomplete data, and suggests that many other such methods exist.

关键词： image reconstruction Channel bank filters Tomography Iterative methods reconstruction algorithms Nuclear and plasma sciences image analysis Radiology Cities and towns Nuclear medicine

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A study on the effect of CT imaging acquisition parameters on lung nodule image interpretation

A study on the effect of CT imaging acquisition parameters o...

引用

conference on Medical Imaging - image Perception, Observer Performance, and Technology Assessment

作者： Yu, Shirley J. Wantroba, Joseph S. Raicu, Daniela S. Furst, Jacob D. Channin, David S. Armato, Samuel G., iii Univ So Calif Los Angeles CA 90089 USA Depaul Univ Chicago IL 60604 USA Northwestern Univ Evanston IL 60208 USA Univ Chicago Chicago IL 60637 USA

ISBN: (纸本)9780819475145

Most Computer-Aided Diagnosis (CAD) research studies are performed using a single type of Computer Tomography (CT) scanner and therefore, do not take into account the effect of differences in the imaging acquisition scanner parameters. In this paper, we present a study on the effect of the CT parameters on the low-level image features automatically extracted from CT images for lung nodule interpretation. The study is an extension of our previous study where we showed that image features can be used to predict semantic characteristics of lung nodules such as margin, lobulation, spiculation, and texture. Using the Lung image data Consortium (LIDC) dataset, we propose to integrate the imaging acquisition parameters with the low-level image features to generate classification models for the nodules' semantic characteristics. Our preliminary results identify seven CT parameters (convolution kernel, reconstruction diameter, exposure, nodule location along the z-axis, distance source to patient, slice thickness, and kVp) as influential in producing classification rules for the LIDC semantic characteristics. Further post-processing analysis, which included running box plots and binning of values, identified four CT parameters: distance source to patient, kVp, nodule location, and rescale intercept. The identification of these parameters will create the premises to normalize the image features across different scanners and, in the long run, generate automatic rules for lung nodules interpretation independently of the CT scanner types.

关键词： Computed Tomography Imaging Acquisition Parameter Semantic Mapping Lung Nodule Interpretation

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Quantitative Accuracy of SPECT reconstructions with a Voxelized CT-based Partial Volume Effect Correction

Quantitative Accuracy of SPECT Reconstructions with a Voxeli...

引用

IEEE Nuclear Science Symposium/Medical Imaging conference

作者： Shcherbinin, S. Celler, A. Univ British Columbia Dept Radiol Med Imaging Res Grp Vancouver BC Canada

ISBN: (纸本)9781424427147

For many clinical applications, it is important to know not only the total activity in an organ of interest, but also the details regarding this activity distribution. In this context, the term "quantitation" would refer to the recovery of not only the total activity but also its voxelized concentration. In this paper, we analyze the quantitative accuracy of activity distributions in Tc-99m SPECT/CT images using data from physical phantom experiments. Our acquisitions followed cardiac (Tc-99m-MIBI) and oncology (Tc-99m-MDP) clinical acquisition protocols and were aiming at providing the medical community with information about absolute Tc-99m activity distribution in the myocardium (for the diagnosis of a balanced triple vessel disease) and in tumors (for evaluation of their aggressiveness). Our algorithm includes the following steps: (i) reconstruction of initial images with corrections for attenuation, scattering, and resolution loss;(ii) Creation of a template (numeric phantom) covering not only the investigated region of interest (ROI), but also other active areas. allowing us to simultaneously take into account both spill-in and spill-out effects;(iii) Projection and reconstruction of this template (with the same corrections as for the initial images);(iv) Voxel-by-voxel partial volume effect correction (PVC). After applying all the aforementioned corrections, we recovered total activities inside both heart and tumor models with errors less than similar to 6% for 33ml containers and similar to 9% for 120ml heart insert. PVC substantially improved not only the accuracy of the recovered total activity (up to 40%), but also its distribution inside the ROI. The current version of this PVC technique makes an assumption that the ratios of activity between different compartments are known. Although this assumption may hold in some clinical situations, for example for tumors in areas with low background activity, at the next stage we plan to test the use of the initial

关键词： SPECT quantitation accuracy phantom image reconstruction partial volume effect correction

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MRI reconstruction Based on Inverse Scale Space and Contourlet Thresholding

MRI Reconstruction Based on Inverse Scale Space and Contourl...

引用

International conference on BioMedical Engineering and Informatics (BMEI)

作者： Wenshu Li Jianhua Luo Qiegen Liu Shenning Hu Department of Biomedical Engineering Shanghai Jiaotong University Shanghai China College of Information and Electronic Zhejiang University of Science and Technology Hangzhou China

ISBN: (纸本)9781424441327

In clinical Magnetic Resonance Imaging (MRI), any reduction in scan time offers a number of potential benefits ranging from high-temporal-rate observation of physiological processes to improvements in patient comfort. In this paper we proposed a reconstruction algorithm by applying contourlet thresholding in inverse scale space flows. We improved the inverse scale space with the noise item in which there is some meaning information and take full advantage of coutourlet transform's characters: perfect reconstruction, noise restraint and good directional selectivity. Several example MRI reconstructions from highly undersampled K-space data are presented for recovery of detailed features from incomplete and inaccurate measurements.

关键词： Magnetic resonance imaging image reconstruction Smoothing methods Biomedical engineering Educational institutions reconstruction algorithms Biomedical measurements Biological tissues Ionizing radiation Time measurement

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Deconvolution of VLBI images based on compressive sensing

Deconvolution of VLBI images based on compressive sensing

引用

International conference on Electrical Engineering and Informatics, ICEEI

作者： Andriyan Bayu Suksmono School of Electrical Engineering and Informatics Institut Teknologi Bandung Bandung Indonesia

Direct inversion of incomplete visibility samples in VLBI (very large baseline interferometry) radio telescopes produces images with convolutive artifacts. Since proper analysis and interpretations of astronomical radio sources require a non-distorted image, and because filling all of sampling points in the UV-plane is an impossible task, image deconvolution has been one of central issues in the VLBI imaging. Up to now, the most widely used deconvolution algorithms are based on least-squares-optimization and maximum entropy method. In this paper, we propose a new algorithm that is based on an emerging paradigm called compressive sensing (CS). Under the sparsity condition, CS capable to exactly reconstructs a signal or an image, using only a few number of random samples. We show that CS is well-suited with the VLBI imaging problem and demonstrate that the proposed method is capable to reconstruct a simulated image of radio galaxy from its incomplete visibility samples taken from elliptical trajectories in the uv-plane. The effectiveness of the proposed method is also demonstrated with an actual VLBI measured data of 3C459 asymmetric radio-galaxy observed by the VLA (very large array).

关键词： Deconvolution image coding image reconstruction Radio interferometry Radio astronomy image analysis Filling image sampling Entropy Extraterrestrial measurements

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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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A physical phantom evaluation of absolute quantitation of simultaneous Tc-99m/In-111 SPECT

A physical phantom evaluation of absolute quantitation of si...

引用

IEEE Symposium on Nuclear Science (NSS/MIC)

作者： S. Shcherbinin A. Celler Medical Imaging Research Group Department of Radiology University of British Columbia Vancouver BC Canada

In dual-radionuclide 99m Tc/ 111 In SPECT imaging, the contamination of 111 In photons into 99m Tc energy window can destroy both the quality and accuracy of the 99m Tc image. In this study, we proposed a model-based reconstruction strategy for practical and quantitatively correct 99m Tc/ 111 In down-scatter compensation. In our approach, instead of time-consuming modeling of down-scatter, we re-scaled the second-order scatter distribution, analytically (using Klein-Nishina formula) calculated for the 111 In photopeak. Specifically, our algorithm includes the following steps: (i) Quantitative reconstruction of the 111 In image (with corrections for attenuation, resolution loss and with analytically modeled self-scatter) from the energy window positioned around 245keV photopeak; (ii) Calculation of the spill-down component (SDC) using extrapolation of the calculated in the previous step noiseless distributions of second-order self-scatter; (iii) Quantitative reconstruction of 99m Tc with a SDC included in the forward step of the OSEM algorithm. A series of experiments with a clinical hybrid SPECT/CT system (Infinia Hawkeye, GE Healthcare) were designed to examine how accurately our algorithm can reconstruct the 99m Tc activity from the projection data containing various levels of 111 In contamination. We used four 30ml plastic containers with different ratios of 99m Tc and 111 In activities placed inside the Jaszczak phantom. The absolute activities for these containers were reconstructed with errors 0.8-7.0% ( 111 In) and 1.6-13.1% ( 99m Tc). Especially, in one of our experiments, the developed SDC compensation technique decreased the absolute activity errors from 44.8% to 8.2% (container #1 filled with 99m Tc activity only); from 61.5% to 1.6% (container #2 with the ratio of 2:1 between 99m Tc and 111 In concentrations), and from 132.8% to 13.1% (container #3 with the ratio of 1:2 between 99m Tc and 111 In concentrations).

关键词： Imaging phantoms image reconstruction Containers Contamination Algorithm design and analysis Single photon emission computed tomography Electromagnetic scattering Particle scattering Attenuation Energy resolution

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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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