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Three-dimensional photon counting integral imaging using Bayesian estimation

OPTICS LETTERS 2010年第11期35卷 1825-1827页

作者： Jung, Jinhyouk Cho, Myungjin Dey, Dipak K. Javidi, Bahram Univ Connecticut Dept Elect & Comp Engn Storrs CT 06269 USA Univ Connecticut Dept Stat Storrs CT 06269 USA

We propose a new estimation method for 3D object reconstruction using photon-counting integral imaging. Earlier studies used maximum likelihood estimation (MLE) as a classical statistical method to reconstruct 3D images from photon-counting elemental images. We use an alternative statistical method known as the Bayesian method, which is more flexible and may perform better than MLE in terms of the mean square error (MSE) metric. The performance of the new reconstruction method is illustrated and compared with MLE by using the MSE. To the best of our knowledge, this is the first report to use the Bayesian method for 3D reconstruction of photon-counting integral imaging. (C) 2010 Optical Society of America

关键词： Photon Imaging photon counting Three-Dimensional Images Bayes methods three-dimensional displays Mean square error maximum likelihood estimation Statistical methods reconstruction algorithm

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Single photon-emission computed tomography

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JOURNAL OF NUCLEAR CARDIOLOGY 2010年第5期17卷 941-973页

作者： Holly, Thomas A. Abbott, Brian G. Al-Mallah, Mouaz Calnon, Dennis A. Cohen, Mylan C. DiFilippo, Frank P. Ficaro, Edward P. Freeman, Michael R. Hendel, Robert C. Jain, Diwakar Leonard, Scott M. Nichols, Kenneth J. Polk, Donna M. Soman, Prem Northwestern Univ Chicago IL 60611 USA Brown Univ Warren Alpert Med Sch Providence RI 02912 USA Henry Ford Hosp Detroit MI 48202 USA MidOhio Cardiol & Vasc Consultants Columbus OH USA Maine Cardiol Associates Portland ME USA Cleveland Clin Cleveland OH 44106 USA Univ Michigan Ann Arbor MI 48109 USA Univ Toronto St Michaels Hosp Toronto ON M5B 1W8 Canada Univ Miami Miller Sch Med Miami FL 33136 USA Drexel Univ Coll Med Newtown Sq PA USA Long Isl Jewish Med Ctr New Hyde Pk NY 11042 USA Hartford Hosp Hartford CT 06115 USA UPMC Cardiovasc Inst Pittsburgh PA USA

The current document is an update of an earlier version of single photon emission tomography (SPECT) guidelines that was developed by the American Society of Nuclear Cardiology. Although that document was only published a few years ago, there have been significant advances in camera technology, imaging protocols, and reconstruction algorithms that prompted the need for a revised document. This publication is designed to provide imaging guidelines for physicians and technologists who are qualified to practice nuclear cardiology. While the information supplied in this document has been carefully reviewed by experts in the field, the document should not be considered medical advice or a professional service. We are cognizant that SPECT technology is evolving rapidly and that these recommendations may need further revision in the near future. Hence, the imaging guidelines described in this publication should not be used in clinical studies until they have been reviewed and approved by qualified physicians and technologists from their own particular institutions.

关键词： current file reconstruction algorithm publications single photon emission computed tomography Cardiology Tomography Otolaryngologists Clinical Study

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Self-Localization and 3-D Model Construction of Pipe by Earthworm Robot Equipped with Omni-Directional Rangefinder

Self-Localization and 3-D Model Construction of Pipe by Eart...

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IEEE International Conference on Robotics and Biomimetics

作者： Atsushi Yamashita Kenki Matsui Ryosuke Kawanishi Toru Kaneko Taro Murakami Hayato Omori Taro Nakamura Hajime Asama Department of Precision Engineering The University of Tokyo Department of Mechanical Engineering Faculty of Engineering Shizuoka University Department of Precision Mechanics Chuo University

ISBN: (纸本)9781457721366

A lot of plumbings such as gas pipes and water pipes exist in public utilities, factories and so on. The use of an omni-directional camera which can take images of 360 deg in surroundings at a time is effective for pipe inspection. However, shape measurement is difficult only with the omni-directional camera. Therefore, in this paper, we propose a reconstruction method of a piping shape by using a rangefinder constructed with an omni-directional camera and an omni-directional laser. The rangefinder is mounted on an earthworm robot. Our method calculates 3-D coordinates by the light section method. By integrating the 3-D coordinates with the information of camera motion estimated by the structure from motion technique, the shape of the pipe is reconstructed. The validity of the proposed method is shown through experiments.

关键词： Rangefinders Pipe profiled pipe gas pipeline Cameras light sections Water pipe reconstruction algorithm earthworms Three Dimensions Robot

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Simulation of Image Fusion of Dual Modality (Electrical Capacitance and Optical Tomography) in Solid/Gas Flow

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SENSING AND IMAGING 2010年第2期11卷 33-50页

作者： Zain, Rasif Mohd Rahim, Ruzairi Abdul Rahiman, Mohd Hafiz Fazalul Abdullah, Jaafar Agensi Nuklear Malaysia Bangi Malaysia Univ Teknol Malaysia Fac Elect Engn Skudai Malaysia Univ Malaysia Perlis Sch Mech Engn Arau Malaysia

This paper presents a novel method of combining dual modality electrical capacitance and optical tomography for applications in monitoring and investigating solid/gas flow. The objective of this method is to obtain a good quality image of the full-scale concentration distribution of solid/gas flow. A new image reconstruction algorithm fused the dual modality images is developed and evaluated.

关键词： Electrical capacitance tomography Optical tomography Dual mode tomography Image fusion reconstruction algorithm Solid/gas flow

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Parallel phase-shifting interferometry based on Michelson-like architecture

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APPLIED OPTICS 2010年第34期49卷 6612-6616页

作者： Min, Junwei Yao, Baoli Gao, Peng Guo, Rongli Zheng, Juanjuan Ye, Tong Chinese Acad Sci State Key Lab Transient Opt & Photon Xian Inst Opt & Precis Mech Xian 710119 Peoples R China Chinese Acad Sci Grad Sch Beijing 100039 Peoples R China

In this paper, we present a new scheme for parallel phase-shifting interferometry that employs a Michelson-like architecture and a simple polarization unit to generate two phase-shifting interferograms with phase shift of pi/2 at a single camera exposure. The parallel phase-shifting unit is built with simple optical components, and the distance between the parallel interferograms can be adjusted conveniently. Phase reconstruction is performed by using an algorithm developed for two-step phase-shifting interferometry. The practicability of the proposed configuration and the reconstruction method is demonstrated by experiments. (C) 2010 Optical Society of America

关键词： reconstruction algorithm Parallel Lines ARCHITECTURE Building construction Phase shift interferometry interference pattern Optical Component

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Numerical method for the inverse heat transfer problem in composite materials with Stefan-Boltzmann conditions

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ADVANCES IN COMPUTATIONAL MATHEMATICS 2010年第4期33卷 471-489页

作者： Hu, Xiaoyi Xu, Xiang Chen, Wenbin Fudan Univ Sch Math Sci Shanghai 200433 Peoples R China

In this paper, one specific kind of heat transfer problem with nonlinear Stefan-Boltzmann conditions are considered in a three dimensional multi-layer domain. Theoretical results for forward and inverse problems are presented. Numerical simulations of specific models from applications are provided to demonstrate the heat transfer process in the composite materials of forward problem. One reconstruction method is proposed to find the corrosion part, and the numerical examples show that the reconstruction algorithm is effective.

关键词： Inverse heat transfer Stefan-Boltzmann interface conditions reconstruction algorithm

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OPTIMIZATION algorithm FOR RECONSTRUCTING INTERFACE CHANGES OF A CONDUCTIVITY INCLUSION FROM MODAL MEASUREMENTS

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MATHEMATICS OF COMPUTATION 2010年第271期79卷 1757-1777页

作者： Ammari, Habib Beretta, Elena Francini, Elisa Kang, Hyeonbae Lim, Mikyoung Ecole Polytech CNRS Ctr Math Appl UMR 7641 F-91128 Palaiseau France Univ Roma La Sapienza Dipartimento Matemat G Castelnuovo I-00185 Rome Italy Univ Firenze Ulisse Dini Dipartimento Matemat I-50134 Florence Italy Inha Univ Dept Math Inchon 402751 South Korea Korea Adv Inst Sci & Technol Dept Math Sci Taejon 305701 South Korea

In this paper, we propose an original and promising optimization approach for reconstructing interface changes of a conductivity inclusion from measurements of eigenvalues and eigenfunctions associated with the transmission problem for the Laplacian. Based on a rigorous asymptotic analysis, we derive an asymptotic formula for the perturbations in the modal measurements that are due to small changes in the interface of the inclusion. Using fine gradient estimates, we carefully estimate the error term in this asymptotic formula. We then provide a key dual identity which naturally yields to the formulation of the proposed optimization problem. The viability of our reconstruction approach is documented by a variety of numerical results. The resolution limit of our algorithm is also highlighted.

关键词： Shape reconstruction vibration analysis asymptotic expansion reconstruction algorithm optimization problem

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The Computational Structure of Spike Trains

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NEURAL COMPUTATION 2010年第1期22卷 121-157页

作者： Haslinger, Robert Klinkner, Kristina Lisa Shalizi, Cosma Rohilla Massachusetts Gen Hosp Martinos Ctr Biomed Imaging Charlestown MA 02129 USA MIT Dept Brain & Cognit Sci Cambridge MA 02139 USA Carnegie Mellon Univ Dept Stat Pittsburgh PA 15213 USA Santa Fe Inst Santa Fe NM 87051 USA

Neurons perform computations, and convey the results of those computations through the statistical structure of their output spike trains. Here we present a practical method, grounded in the information-theoretic analysis of prediction, for inferring a minimal representation of that structure and for characterizing its complexity. Starting from spike trains, our approach finds their causal state models (CSMs), the minimal hidden Markov models or stochastic automata capable of generating statistically identical time series. We then use these CSMs to objectively quantify both the generalizable structure and the idiosyncratic randomness of the spike train. Specifically, we show that the expected algorithmic information content ( the information needed to describe the spike train exactly) can be split into three parts describing ( 1) the time-invariant structure ( complexity) of the minimal spike-generating process, which describes the spike train statistically;( 2) the randomness ( internal entropy rate) of the minimal spike-generating process;and ( 3) a residual pure noise term not described by the minimal spike-generating process. We use CSMs to approximate each of these quantities. The CSMs are inferred nonparametrically from the data, making only mild regularity assumptions, via the causal state splitting reconstruction algorithm. The methods presented here complement more traditional spike train analyses by describing not only spiking probability and spike train entropy, but also the complexity of a spike train's structure. We demonstrate our approach using both simulated spike trains and experimental data recorded in rat barrel cortex during vibrissa stimulation.

关键词： computations representation automata reconstruction algorithm Minimal TRAIN Automata

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reconstruction algorithm in photoacoustic tomography

Reconstruction algorithm in photoacoustic tomography

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4th International Conference on Photonics and Imaging in Biology and Medicine

作者： Song, Zhiyuan Jiang, Jingying Wang, Ruikang K. Zhang, Fan Yao, Jianquan Tianjin Univ Inst Laser & Optoelect Coll Precis Instrument & Optoelect Engn Tianjin 300072 Peoples R China Oregon Hlth & Sci Univ Dept Biomed Engn Beaverton OR 97006 USA Tianjin Univ Coll Precis Instruments & Opto Elect Engn Dept Biomed Engn Tianjin 300072 Peoples R China

ISBN: (纸本)081946080X

The photoacoustic (PA) effect refers to the generation of acoustic waves by the modulated optical radiation. A novel tissue imaging technique, photoacoustic imaging is using the acoustic waves made in the PA effect to reconstruct the sample. It whose characteristic is combining the advantages of pure optical imaging and pure ultrasound imaging can map the high contrast and high spatial resolution tissue image. The PA imaging reconstruction algorithm performing the signal filtering operation first and then to reduce the signal data to the image, has the important influence on the quality of the image made by the experiment of PA. With the laser appearance in 1960s, the PA imaging technique made great advance and the reconstruction algorithm gains quick development. The prevalent PA reconstruction algorithms include Kruger's 3D inverse Radon transform, Frenz's Fourier transform, Lihong Wang's method based on the analytic solution. Nowadays, PA imaging technique develops to the real-time PA image. So to choose a suitable fast algorithm is significant to the PA imaging system's application. We will review the current PA imaging reconstruction algorithm and compare them in the aspect of the tissue imaging spatial resolution and so on.

关键词： pA imaging reconstruction algorithm spatial resolution tissue

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A theoretical model for EM-ML reconstruction algorithms applied to rotating PET scanners

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PHYSICS IN MEDICINE AND BIOLOGY 2009年第7期54卷 1909-1934页

作者： Iriarte, A. Sorzano, C. O. S. Carazo, J. M. Rubio, J. L. Marabini, R. Univ Autonoma Madrid Escuela Politecn Super E-28049 Madrid Spain Univ Autonoma Madrid Ctr Nacl Biotecnol E-28049 Madrid Spain Univ San Pablo CEU Bioengn Lab Boadilla Del Monte Madri 28668 Spain Univ Politecn Madrid ETSI Telecomunicac Dpto Ingn Elect Biomed Image Technol Grp E-28040 Madrid Spain Networking Res Ctr Bioengn Biomat & Nanomed CIBER Madrid Spain

In this paper we show how to compute the normalizing and the system matrix terms of the EM-ML reconstruction algorithm for rotating planar detector PET scanners. The method introduced is valid for either pixelated or continuous scintillators. We base our computations in geometrical considerations, but other effects of the PET process can be easily included. In this regard, the intrinsic resolution of the detection system, the depth of interaction (DOI) of the incident gamma rays and the efficiency of the scintillators have been modeled in our development. The computation of the normalizing term and the system matrix is valid for any basis function used for the discrete approximation of the radionuclide concentration. We show that our computations are comparable to those of a Monte Carlo method at a small fraction of the computational cost.

关键词： electronic monitoring of offenders Positron emission tomography unit algorithms Valid Scintillators Monte Carlo technique discrete approximation radionuclide concentration reconstruction algorithm Theoretical Models algorithms Gamma Rays Detection systems Positron Emission Tomography Systems basis functions normalising

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