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检索条件"任意字段=International Congress on Image and Signal Processing, BioMedical Engineering and Informatics"

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Virtual lumen insufflation and its application in virtual endoscopy

Virtual lumen insufflation and its application in virtual en...

引用

4th international congress on image and signal processing, CISP 2011

作者： Li, Lei Zhao, Jun Zhang, Danfeng Lu, Lin Wang, Zhizhong Department of Biomedical Engineering Shanghai Jiao Tong University Shanghai 200240 China

ISBN: (纸本)9781424493067

In this paper, we present a virtual lumen insufflation algorithm and its applications in virtual endoscopy of both pipe-like and non-pipe-like organs. The surface of the lumen outer wall was modeled as isotropic elastic shell elements. The insufflation procedure was simulated by nonlinear finite element method with a constant air pressure exerted on the interior of the shell. The deformation of the inner surface of the lumen was implemented by thin plate spline based kernel transformation. Experiments with both phantom and ten CT data sets were designed to validate the effectiveness of the proposed algorithm. The results show the insufflated lumen is helpful in extending visual field, and extracting exact centerline. Therefore, it will improve visualization quality of virtual straightening, unfolding, and eversion. Compared to the real insufflation, the virtual insufflation can be performed on any kind of surfaces without the closed requirement, and does not change the status of the inner surface. The virtual insufflation will be an effective complement of the real insufflation, especially in some organs, such as blood vessel and bladder, that are unsuitable or hard to insufflate, and some patients who have perforations with increasing risk if performing insufflation. © 2011 IEEE.

关键词： Blood vessels

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A study on the correlation between ultrasonic cavitation yields and the acoustic attenuation of interference waves

A study on the correlation between ultrasonic cavitation yie...

引用

4th international congress on image and signal processing, CISP 2011

作者： Noh, Si Cheol Kim, Ju Young Kim, Jin Su Kang, Jung Hoon Choi, Heung Ho Department of Radiological Science International University of Korea Jinju Korea Republic of Department of Biomedical Engineering Inje University Gimhae Korea Republic of

ISBN: (纸本)9781424493067

The evaluation of ultrasonic cavitation yield is difficult because the cavitation effect has non-linear characteristics. In this study, as a fundamental research for the evaluation of cavitation yield, the acoustic characteristics of the bubble cloud were analyzed by measuring the attenuation in the bubble cloud. First, we cause cavitation using a concave-type single ultrasonic transducer. Subsequently, we transmit the 2.25 MHz ultrasound beam across the center of the bubble cloud. Under all sonication conditions, the attenuation was increased with an excellent correlation coefficient (0.7197, 0.8544, 0.8469, and 0.7795) in proportion to the rise in sonication intensity. Based on these results, we believe that this relationship is useful for evaluating cavitation yields. © 2011 IEEE.

关键词： Cavitation

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The efficient realization of B mode ultrasonic digital scan conversion based on radix-4 CORDIC algorithm

The efficient realization of B mode ultrasonic digital scan ...

引用

4th international congress on image and signal processing, CISP 2011

作者： Zeng, Peng Lu, Fanshui Zhao, Xingqun Department of Biomedical Engineering Southeast University Nanjing Jiangsu 210096 China

ISBN: (纸本)9781424493067

Coordinate transform is the core technology in Digital Scan Conversion (DSC) of B-mode ultrasonic, and its speed mostly determines the frame rate of B-mode imaging. In the traditional coordinate transform process, ultrasonic echo data is converted from polar coordinate to rectangular directly;the process is time-consuming and the data is unsuitable for post-treatment. In this paper, we employed the CORDIC Algorithm in coordinate transform. We compared the conventional radix-2 CORDIC algorithm with the improved radix-4 CORDIC algorithm and found the later saved half iterations at the same frequency. What's more, radix-4 CORDIC algorithm had smaller hardware consumption when using the pipelined structure. These results revealed that radix-4 CORDIC is an excellent method for high-speed DSC of B-mode ultrasonic. © 2011 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Comparison of PUMA and CUNWRAP to 2-D phase unwrapping

Comparison of PUMA and CUNWRAP to 2-D phase unwrapping

引用

2011 international Conference on Electrical engineering and informatics, ICEEI 2011

作者： Syakrani, Nurjannah Mengko, Tati L.R. Suksmono, A.B. Baskoro, Eddy T. Biomedical Engineering Research Group ITB Indonesia Telecommunication Engineering Research Group ITB Indonesia Combinatorial Mathematics Research Group ITB Indonesia School of Electrical Engineering and Informatics Bandung Institute of Technology Indonesia

ISBN: (纸本)9781457707520

Phase unwrapping (PU) is the process of recovering the absolute phase from the wrapped phase . PU is the one of the most important step of the interferometry SAR processing for calculation of DEM, and can be applied to other field, such as MRI medical image. This paper presents comparison two algorithms for two dimensional phase unwrapping based on network programming, namely PUMA and CUNWRAP. The PUMA (Phase Unwrapping Maximum Flow), PUMA has first order Markov Random Fields used for the energy minimization framework. PUMA algorithm solves integer optimization problems, by computing a sequence of binary optimizations, solved by graph cuts techniques for PU max-flow/min-cut. PUMA is the minimum Lp norm or Global class of PU problem. CUNWRAP (Constantini unwrapping) is a phase unwrapping method that exploits globally the integer qualities of the problem. CUNWRAP method leads to formulating the PU model as the problem of minimizing the weighted deviations between the estimated and the unknown neighboring pixel differences of the unwrapped phase with the constraint that the deviation must be integer multiple of 2π. CUNWRAP used as network structure and makes it possible to employ very efficient strategies (linear programming method) for its solution. The formulation of phase unwrapping problem by CUNWRAP is a global minimization problem with integer variable. The two algorithms applied to test performed on simulated and real image (interferometric SAR data and magnetic resonance imaging). Ratio of elapsed time between CUNWRAP and PUMA, range for simulation image test is 1.6 to 9.09 times, while range for real image test is 4 to 37 times. Based on Peak signal to Noise Ratio (PSNR), effect of noise for simulated data, view of unwrapping result, elapsed time, show that PUMA is better than CUNWRAP globally. © 2011 IEEE.

关键词： Magnetic resonance imaging

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4th international Joint Conference on biomedical engineering Systems and Technologies, BIOSTEC 2011

4th International Joint Conference on Biomedical Engineering...

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4th international Joint Conference on biomedical engineering Systems and Technologies, BIOSTEC 2011

The proceedings contain 28 papers. The special focus in this conference is on biomedical engineering Systems and Technologies. The topics include: informatics-driven infectious disease research;a simple and low cost device for automatically supervising urine output of critical patients;photoplethysmogram processing using an adaptive single frequency phase vocoder algorithm;a configurable integrated circuit for biomedical signal acquisition;movement disorder assessment and attenuation techniques for removal of tremor;a new approach for diagnostic investigation of total hip replacement loosening;wearable monitoring unit for swimming performance analysis;3D protein surface segmentation through mathematical morphology;simple tool for semi-automated evaluation of yeast colony images;reconstructing gapless ancestral metabolic networks;discretized kinetic models for abductive reasoning in systems biology;quasi-steady state approximations and multistability in the double phosphorylation-dephosphorylation cycle;towards a patient-specific model of lung volume using absolute electrical impedance tomography (aEIT);auditory processing inspired robust feature enhancement for speech recognition;a robust and efficient spatio-temporal feature selection for interpretation of EEG single trials;time series clustering algorithm for two-modes cyclic biosignals;non-contact pulse wave velocity assessment using optical methods;fractal-based brain state recognition from EEG in human computer interaction;semantic-based conformance checking of computer interpretable medical guidelines;REST-style architecture and the development of mobile health care solutions;biomedical literature retrieval based on patient information;evaluating information security effectiveness with health professionals;using social network analysis to study the knowledge sharing patterns of health professionals using web 2.0 tools;a semantic-based platform for medical image storage and sharing using the grid;securing the a

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Adaptive Backtracking Scheme for Iterative Shrinkage Thresholding Algorithms

Adaptive Backtracking Scheme for Iterative Shrinkage Thresho...

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2011 4th international congress on image and signal processing(第四届图像与信号处理国际学术会议 CISP 2011)

作者： Geming Wu Wenhui Yang Tao Song Department of Biomedical Engineering Institute of Electrical Engineering Chinese Academy of Sciences Beijing China

Iterative shrinkage/thresholding algorithms (ISTAs) have recently been proposed to solve linear inverse problems arising in signal and image processing. The convergence rate of ISTAs relies on a scalar known as step size, which is unknown and expensive to compute in practice especially for large-scale problems. Usually a backtracking rule is employed to choose an appropriate step size which guarantees the convergence condition and speed up ISTAs at the same time. In this paper, we propose a new method to compute the step size exactly. Experimental results show the effectiveness of the proposed algorithm.

关键词： Linear inverse problem iterative shrinkage- thresholding algorithm Q regularization backtracking

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Feature extraction and choice in PCG based on Hilbert Transfer

Feature extraction and choice in PCG based on Hilbert Transf...

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congress on image and signal processing, CISP

作者： Xiao-Juan Hu Jia-Wei Zhang Gui-Tao Cao Hong-Hai Zhu Hao Li Software Engineering Institute East China Normal University Shanghai China Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou China

In this paper, the key features of Phonocardiogram (PCG) are extracted based on the slopes of envelop of Hilbert Transfer after relocating boundaries with energy envelope segmentation. In this attempt the overall accuracy of features extraction is found to be 91.95%. 25 significant clinical features are introduced, and chosen to make two-kind classification by SVM. In the results of two-kind classification, the overall accuracy is 91.3%, which is better than 85.23% accuracy in 100 features of Shannon Energy Envelope. The result shows that features including clinical signification is of signification for enhancing the accurate rate of Phonocardiogram classification.

关键词： Heart Feature extraction Diseases Accuracy Pathology biomedical imaging Valves

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Multiscale Multifractal Analysis of 12-lead ECG signals of Mice based on Wavelet Transform and Coarse-grained Approach

Multiscale Multifractal Analysis of 12-lead ECG Signals of M...

引用

2011 4th international congress on image and signal processing(第四届图像与信号处理国际学术会议 CISP 2011)

作者： Chengyu Huo Xinbao Ning Jun Wang Xiaolin Huang Xiaojun Qiu Xiaofei Ma Key Laboratory of Modern Acoustics Institute for Biomedical Electronic Engineering School of Elect Key Laboratory of Modern Acoustics Institute for Biomedical Electronic Engineering School of Elect

In recent years, the nonlinear analysis of electrocardiogram (ECG) signals using multifractal theory has been proved to be effective. In order to further study the features in normal and pathological ECG signals with multifractal analysis, drugs experiments were conducted on mice. Mice received various drugs to imitate different physiological and pathological conditions, and the distributions of the singularity strength range with different scale factors from the 12-lead ECG signals of healthy and drug injected mice were calculated, using coarsegrained approach and wavelet transform respectively. The results showed that there is a certain range of characteristic frequency in the curve of singularity strength range versus scale factors from the multiscale multifractal analysis results on mice ECG signals. In this range, the singularity strength range Aa gets the maximum value, which can best represent the complex fractal structures and dynamic characteristics of the heart, and be most sensitive to distinguish various physiological and pathological states.

关键词： nonlinear ECG multifractal multiscale characteristic frequency

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A Study on the Correlation between Ultrasonic Cavitation Yields and the Acoustic Attenuation of Interference Waves

A Study on the Correlation between Ultrasonic Cavitation Yie...

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2011 4th international congress on image and signal processing(第四届图像与信号处理国际学术会议 CISP 2011)

作者： Si Cheol Noh Heung Ho Choi Jin Su Kim Jung Hoon Kang Ju Young Kim Department of Radiological Science International University of Korea Jinju Korea Department of Biomedical Engineering Inje University Gimhae Korea

The evaluation of ultrasonic cavitation yield is difficult because the cavitation effect has nonlinear characteristics. In this study, as a fundamental research for the evaluation of cavitation yield, the acoustic characteristics of the bubble cloud were analyzed by measuring the attenuation in the bubble cloud. First, we cause cavitation using a concave-type single ultrasonic transducer. Subsequently, we transmit the 2.25 MHz ultrasound beam across the center of the bubble cloud. Under all sonication conditions, the attenuation was increased with an excellent correlation coefficient (0.7197, 0.8544, 0.8469, and 0.7795) in proportion to the rise in sonication intensity. Based on these results, we believe that this relationship is useful for evaluating cavitation yields.

关键词： Cavitation yield monitoring attenuation interference wave acoustic chacteristic

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Novel form of photonic crystals for bioimaging contrast enhancement

Novel form of photonic crystals for bioimaging contrast enha...

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congress on image and signal processing, CISP

作者： Haiyan Li Jun Jiao Jeremy Campbell Gregory L. Rorrer Bin Jiang Yuming Liu Ruikang Wang Physics Department Portland State University Portland OR USA Mathematics Department Portland State University Portland OR USA Department of Chemical Engineering Oregon State University Corvallis OR USA Department of Bioengineering University of Washington Seattle WA USA

We report here a diatom frustule-based photonic structure acting as an efficient near infrared contrast agent. The frustule of diatom Pinnularia sp. consists of two valves with same exquisite fine 2D periodicity at the submicron scale, similar to a 2D photonic crystal. Decoration of diatom frustules with higher refractive index materials leads to a refractive indices contrast increase between the array of pores and the frame. Our calculation and measurements show that magnetite nanoparticle-decorated diatom frustules have a wide pseudo photonic band gap in near infrared range, resulting in a strong near infrared reflection. It allows the magnetite nanoparticle-decorated diatom frustules to be imaged with a high optical coherence tomography contrast.

关键词： Magnetic resonance imaging Optical imaging Magnetic separation Magnetic domains biomedical optical imaging Optimized production technology Coherence

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