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检索条件"主题词=Image reconstruction algorithm"

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A Nonlinear Modified CONVEF-AD Based Approach for Low-Dose Sinogram Restoration

A Nonlinear Modified CONVEF-AD Based Approach for Low-Dose S...

引用

1st International Conference on Computer Vision and image Processing (CVIP)

作者： Tiwari, Shailendra Srivastava, Rajeev Arya, K. V. Indian Inst Technol BHU Dept Comp Sci & Engn Varanasi 221005 Uttar Pradesh India ABV Indian Inst Informat Technol & Management Multimedia & Informat Secur Lab Gwalior 474015 India

ISBN: (纸本)9789811021046;9789811021039

Preprocessing the noisy sinogram before reconstruction is an effective and efficient way to solve the low-dose X-ray computed tomography (CT) problem. The objective of this paper is to develop a low-dose CT image reconstruction method based on statistical sonogram smoothing approach. The proposed method is casted into a variational framework and the solution of the method is based on minimization of energy functional. The solution of the method consists of two terms, viz., data fidelity term and a regularization term. The data fidelity term is obtained by minimizing the negative log likelihood of the signal-dependent Gaussian probability distribution which depicts the noise distribution in low-dose X-ray CT. The second term, i.e., regularization term is a nonlinear CONvolutional Virtual Electric Field Anisotropic Diffusion (CONVEF-AD) based filter which is an extension of Perona-Malik (P-M) anisotropic diffusion filter. The main task of regularization function is to address the issue of ill-posedness of the solution of the first term. The proposed method is capable of dealing with both signal-dependent and signal-independent Gaussian noise, i.e., mixed noise. For experimentation purpose, two different sinograms generated from test phantom images are used. The performance of the proposed method is compared with that of existing methods. The obtained results show that the proposed method outperforms many recent approaches and is capable of removing the mixed noise in low-dose X-ray CT.

关键词： X-ray computed tomography Statistical sinogram smoothing image reconstruction algorithm Noise reduction Anisotropic diffusion

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Measurement of photoacoustic detector sensitivity distribution by robotic source placement

Measurement of photoacoustic detector sensitivity distributi...

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9th Conference on Biomedical Thermoacoustics, Optoacoustics and Acousto-optics

作者： Ephrat, Pinhas Carson, Jeffrey J. L. St Josephs Hlth Ctr Lawson Hlth Res Inst Imaging Program London ON Canada

ISBN: (纸本)9780819470317

Many photoacoustic imaging systems use back projection-based image reconstruction algorithms to estimate photoacoustic source locations from the time-of-flight pressure information collected by either a scanned single transducer or an array of stationary transducer elements. Accurate image reconstruction requires that the transducer(s) locations relative to the imaged volume and the transducer(s) sensitivity distribution within the imaged volume be accurately known. The objective of this work was to develop a method for estimation of the sensitivity distribution of a transducer array. Our approach was to capture for each transducer element the response to a photoacoustic point source that was robotically scanned throughout the imaging volume. The temporally resolved photoacoustic signal was then processed to obtain the relative transducer sensitivity at the source location. We performed a scan over a transducer array fabricated in our laboratory that consisted of twelve 3 mm elements in a 30 mm annular ring arrangement. We measured both the sensitivity distribution of single elements, from which the spatial and angular sensitivity profiles were extracted, as well as the simultaneous response of all transducer elements, which allowed us to locate the effective position of each element, but also highlighted the non-uniformity between transducers' response of up to 20%. We present these and other measured parameters, and discuss their significance as well as their effect on our image reconstruction algorithm.

关键词： photoacoustic imaging three-dimensional imaging image reconstruction algorithm ultrasound transducer array detector non-uniformity detector sensitivity distribution

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Development and quality characterization of a novel CT system

Development and quality characterization of a novel CT syste...

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Conference on Medical Imaging - Physics of Medical Imaging

作者： Schegerer, Alexander A. Lingenheil, Martin Klaften, Matthias Foerster, Thomas de Angelis, Martin Hrabe Hoeschen, Christoph Helmholtz Zentrum Munchen Inst Radiat Protect Ingolstadter Landstr 1 D-85764 Neuherberg Germany Helmholtz Zentrum Munchen Inst Expt Genet D-85764 Neuherberg Germany

ISBN: (纸本)9780819480231

Novel geometrical designs of computed tomography (CT) scanners in combination with novel image reconstruction algorithms promise to reduce ionizing radiation exposure to the patient in CT scans. While the sampling density of the Field Of View (FOV) is retained, the image quality can even be increased in contrast to conventional CT scanners. In this study, we present first images obtained with a novel CT scanner that we developed in our working group. In this open CT system with irradiation within a fan beam, parallel Radon data are directly obtained for image reconstruction using the OPED (Orthogonal Polynomial Expansion on the Disk) algorithm. This algorithm uses Radon data directly, i.e., without any further data processing such as rebinning and interpolation. We experimentally test theoretical predictions for this system by quantifying image quality parameters in comparison with corresponding parameters that are derived from the images of a conventional scanner of the 3(rd) generation. The modulation transfer function (MTF) and noise power spectrum (NPS) are determined using a test phantom. The novel CT system quantitatively shows the same noise property as the conventional scanner. The resolution that is reached in the center of a reconstructed image is nearly identical for both scanner types. But we found that the resolution that is achieved in the novel CT system does not depend on the image position while the MTF of the conventional scanner decreases for radially outer regions of the image.

关键词： computed tomography (CT) CT design micro CT image reconstruction algorithm FBP OPED image quality MTF NPS

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Experimental Study on Transporting Concentration of Pulverized -Coal Using ECT

Experimental Study on Transporting Concentration of Pulveriz...

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International Conference on Materials, Transportation and Environmental Engineering (CMTEE 2013)

作者： Liu Jing Du Zheng Chen Shanshan Sun Meng Henan Polytech Univ Sch Civil Engn Jiaozuo Henan Peoples R China Chinese Acad Sci Inst Engn Thermophys Beijing 100864 Peoples R China

ISBN: (纸本)9783037858042

Accurate measurement of the concentration of pulverized-coal in various pipes as a guidance to proper control plays a key role in assuring safe and economic operation of a pulverized coal-fired boiler during the combustion process. Experimental studies are carried out on the measurement of a lean mass flow in a pneumatic conveying pipeline using electrical capacitance tomography(ECT). A cyclone separator is employed in this system where the sensors are placed in order to compensate the inhomogeneity of the sensor sensitivity. The distribution of void fraction in radial direction, the average void fraction and the wavy characteristics are analyzed. The feasibility and reliability of the method are verified by the experimental results.

关键词： image reconstruction algorithm Electrical capacitance tomography(ECT) Pulverized coal concentration

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Electrical Capacitance Tomography reconstruction algorithm using Kalman Filter 8

Electrical Capacitance Tomography Reconstruction Algorithm u...

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Proceedings 2015 8 International Congress on image and Signal Processing (CISP)

作者： Zhang, Lifeng Li, Jia Tian, Pei North China Elect Power Univ Dept Automat Baoding Peoples R China

ISBN: (纸本)9781467390989

In the Electrical Capacitance Tomography, the distribution of permittivity in the pipe can be estimated using the capacitance measurements with help of the reconstruction algorithms. In this paper, the permittivity distribution was reconstructed with Kalman Filter and several simulations were carried out to evaluate the effect of different initial values of the grey values in the image and the estimate error covariance on reconstructed image. In addition, Landweber and Tikhonov were used to reconstruct the object to compare with the reconstructed effect of Kalman Filter with suitable initial values.

关键词： Electrical capacitance tomography image reconstruction algorithm Kalman Filter Initial values

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Study of Computerized Tomography Based Multiphase Flow Measurement

Study of Computerized Tomography Based Multiphase Flow Measu...

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IEEE International Conference on Automation and Logistics

作者： Zhao Wencang Cao Changli Qingdao Univ Sci & Technol Coll Automat & Elect Engn Qingdao 266042 Peoples R China

ISBN: (纸本)9781424425020

On the basis of analyzing ray and electronical tomographic system fundamental and its advantage and disadvantage, an electrical impedance tomography system used in flow pattern recognition of multiphase flow is introduced, and a new algorithm used in EIT image reconstruction is proposed. This algorithm will improve the convergence speed and the quality of the image reconstruction by using the method of mixed genetic algorithm and landweber iteration algorithm. The experimental results show that the EIT system is an effective system for multiphase flow measurement, the algorithm has the advantage of good convergence stability and rapid convergence rate.

关键词： Multiphase flow Computerized tomography image reconstruction algorithm

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Study on algorithm of electrical resistance tomography for measurement of two-phase flow

引用

IMACS Multiconference on Computational Engineering in Systems Applications (CESA 2006)

作者： Yu, J. H. Zhejiang Gongshang Univ Coll Informat & Elect Engn Hangzhou 310018 Peoples R China

ISBN: (纸本)9787302139225

image reconstruction of Electrical Resistance Tomography (ERT) is an ill-posed inverse problem. In this work, a new image reconstruction algorithm of ERT for the measurement of two-phase flow is studied. The new algorithm is a hybrid of Tikhonov regularization principle and Algebraic reconstruction Technique (ART) algorithm. Tikhonov regularization principle is introduced to overcome the instability problem of initial image reconstruction. And, ART algorithm is used to improve the image quality of the original reconstructed image. Experimental results show that the hybrid image reconstruction algorithm can efficiently overcome the ill-posed problem of image reconstruction of ERT and is superior to the sensitivity coefficient algorithm. It is respected to be used in industry.

关键词： ERT image reconstruction algorithm two-phase flow tomography

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Design of High-speed Electrical Capacitance Tomography System

Design of High-speed Electrical Capacitance Tomography Syste...

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4th International Conference on Digital image Processing (ICDIP)

作者： Gao, Yanli Zhang, Yonggao Wang, Weidong East China Jiaotong Univ Nanchang 330013 Peoples R China Jiangxi Vocat & Tech Coll Elect Nanchang Nanchang 330016 Jiangxi Peoples R China

ISBN: (纸本)9780819489913

It is important to improve quality and rate of reconstruction image, which also is a hot spot for ECT researchers, in order to realize measurement on-line for multi-phase flow parameters of high-speed industry processes by using electrical capacitance tomography (ECT). In this paper, key issues in designing high-speed ECT system including algorithms and circuits (small capacitance measurement module, data acquisition control module and communication module) are analyzed and discussed. To a great extent, the speed of hardware circuit depends on the performance of small capacitance measurement circuit. This paper presented ac-based and active differential capacitance measuring circuits, which are suitable for rapidly ECT imaging. The real time performances and image reconstruction process of ECT system are discussed. Key technology and methods for high-speed ECT system are given in this paper.

关键词： ECT image reconstruction algorithm capacitance measurement circuit high-speed data acquisition

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Simulation study on Ultrasonic Tomography in Bubbly Gas/Liquid Two-phase Flow

Simulation study on Ultrasonic Tomography in Bubbly Gas/Liqu...

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IEEE International Conference on Imaging Systems and Techniques (IST) / IEEE International School on Imaging

作者： Li, Nan Xu, Kun Northwestern Polytech Univ Sch Automat Xian 710071 Shaanxi Peoples R China Beijing Univ Technol Beijing Engn Res Ctr Precis Measurement Technol & Beijing 100124 Peoples R China

ISBN: (纸本)9781538616208

Ultrasonic tomography (UT) has been widely applied in industrial process imaging. image reconstruction algorithm is one of the most popular research interests in UT field. In this paper, a novel method for construction of sensitivity matrix was proposed. The method can be used to improve linear back projection (LBP) algorithm for detection of the gas bubble distribution in a gas/liquid two-phase bubbly flow. Hybrid reconstruction (HR) algorithm was introduced to improve image reconstruction performance based on the presented method. Furthermore, a series of models have been established to evaluate the performance of the above algorithms. Three quantitative evaluation criteria were selected to evaluate the quality of reconstructed images. The results indicate that the fan-shaped sensitivity matrix is feasible and valid for the LBP algorithm in improving image quality.

关键词： image reconstruction algorithm linear back projection ultrasonic tomography bubbly flow

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Time-domain fluorescence molecular tomography based on experimental data

Time-domain fluorescence molecular tomography based on exper...

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Conference on Optical Tomography and Spectroscopy of Tissue VIII

作者： Zhang, Limin Li, Jiao Gao, Feng He, Huiyuan Zhao, Huijuan Tianjin Univ Coll Precis Instrument & Optoeletron Engn Tianjin 300072 Peoples R China

ISBN: (纸本)9780819474209

We propose a 3D scheme for time-domain fluorescence molecular tomography within the normalized Born-ratio formulation. A finite element method solution to the Laplace transformed time-domain coupled diffusion equations is employed as the forward model, and the resultant linear inversions at two distinct transform-factors are solved with an algebraic reconstruction technique to separate fluorescent yield and lifetime images. By use of a multichannel time-correlation single photon counting system, we experimentally validate that the proposed scheme can achieve simultaneous reconstruction of the fluorescent yield and lifetime distributions with a reasonable accuracy.

关键词： Fluorescence molecular tomography Time-domain image reconstruction algorithm Generalized pulse spectrum technique

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