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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： A. Yazdan-Shahmorad H. Soltanian-Zadeh R.A. Zoroofi Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department Faculty of Engineering University of Tehran Tehran Iran Radiology Department Henry Ford Health System Image Analysis and Communications Laboratory Detroit MI USA

Magnetic resonance spectroscopic imaging (MRSI) is a non-invasive technique for assessing biochemical fingerprint of tissue composition. The need to differentiate between normal and abnormal tissues and determine type of abnormality before biopsy or surgery motivated development and application of MRSI. There are several technical reasons that make the brain easier than other organs to be examined with MRSI. This work presents our proposed methods and results for the analysis of the brain spectra of patients with three tumor types (malignant glioma, astrocytoma, and oligodendroglioma). After extracting features from MRSI data using wavelet and wavelet packets, we use artificial neural networks to determine the abnormal spectra and the type of abnormality. We evaluated the proposed methods using clinical and simulated MRSI data and biopsy results. The MRSI analysis results were correct 97% of the time when classifying the spectra of the clinical MRSI data into normal tissue, tumor, and radiation necrosis. They were correct 72% and 83% of the time when determining tumor types using the clinical and simulated MRSI data, respectively.

关键词： Wavelet packets Neoplasms Artificial neural networks Biopsy Magnetic resonance Spectroscopy Magnetic resonance imaging Fingerprint recognition Surgery Cancer

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Blind audio watermark decoding using independent component analysis

Blind audio watermark decoding using independent component a...

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International Conference on Pattern Recognition

作者： S. Sener B. Gunsel Institute of Informatics Satellite Communication and Remote Sensing Istanbul Technical University Maslak Istanbul Turkey Multimedia Signal Processing and Pattern Recognition Laboratory Electrical-Electronics Faculty. Department of Electronics and Communications Engineering Istanbul Technical University Maslak Istanbul Turkey

This paper proposes an audio watermark extraction technique which adopts independent component analysis (ICA) for blind watermark decoding. Unlike the existing work, our method allows to combine data synchronization and watermark decoding into one optimization procedure, thus robust to transmission over different channels. Watermark encoder is designed as a nonlinear data embedding machine which is compatible to MPEG Layer 1 Model 1. It is shown that the proposed ICA based watermark decoding scheme allows decoding watermark info accurately even though the watermark to signal ratio is less than -20 dB. The method is robust to stereo-to-mono conversions and performs very well when the channel noise level is high.

关键词： Watermarking Independent component analysis Noise robustness Iterative decoding Frequency synchronization signal processing Pattern recognition Protection Frequency domain analysis signal to noise ratio

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A novel statistical model for simulation of arterial and intracranial pressure

A novel statistical model for simulation of arterial and int...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： M. Aboy J. McNames R. Hornero T. Thong D. Cuesta D. Novak B. Goldstein Signal Theory and Communicatións Department ETSI-Telecomunicacion University of Vigo Spain Biomedical Signal Processing Laboratory Electrical and Computer Engineering Portland State University Portland USA Biomedical Engineering Department/Pediatrics Department Oregon Health and Sciences University Portland USA ETS-Alcoi Polytechnic University of Valencia Spain Department of Cybernetics Czech Technical University Czech Republic

We describe a novel statistical model of pressure signals that incorporates the effects of respiration on arterial (ABP) and intracranial pressure (ICP). This model can be used to synthesize pulsatile ABP and ICP signals with similar time, frequency, and variability characteristics of real pressure signals. These synthetic signals can be used during the development, simulation, or quantitative assessment of biomedical algorithms in a variety of applications.

关键词： Cranial pressure signal processing algorithms signal processing Pulse modulation Amplitude modulation Biomedical engineering Testing Availability Detection algorithms Parameter estimation

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Heart rate variability analysis of effect of nicotine using periodograms

Heart rate variability analysis of effect of nicotine using ...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： T. Thong I.O. Yung D.P. Zajdel R.M. Ellingson J. McNames M. Aboy B.S. Oken Department of Biomedical Engineering Oregon Health and Sciences University Beaverton OR USA School of Medicine Oregon Health and Sciences University Portland OR USA Department of Neurology Oregon Health and Sciences University Portland OR USA Biomedical Signal Processing Laboratory Electrical and Computer Engineering Portland State University Portland OR USA

Heart rate variability (HRV) is frequently used to measure autonomic nervous system (ANS) activity. However, little is known about the mechanism underlying pharmacologically induced changes in HRV. Previous research has shown that nicotine exposure stimulates the ANS, mediating a wide spectrum of physiological and behavioral effects, including altered respiratory sinus arrhythmia and enhanced arousal and attention. Using Lomb-Welch periodograms, the effect of nicotine on the ANS in 14 nicotine-naive human subjects are studied. Results showed an increase in the low frequency (LF) to high frequency (HF) ratio with little change in mean heart rate. Results suggest that nicotine affects both sympathetic and parasympathetic reactivities and that the LF/HF best characterizes early ANS activated nicotine changes in HRV. The Lomb-Welch periodogram of the HRV is also compared to the conventional interpolated Welch periodogram. The attenuation of the high frequency components due to interpolation of the non-uniform R-R intervals is found to be a function of the power of the high frequency components, increasing with increasing power. Thus analyses using Welch periodograms that make use of the high frequency components may yield erroneous results.

关键词： Heart rate Heart rate variability Sampling methods Interpolation Biomedical engineering Autonomic nervous system Neurotransmitters Spectral analysis Mesh generation Fourier transforms

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Using handheld devices for real-time wireless teleconsultation

Using handheld devices for real-time wireless teleconsultati...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： K.A. Banitsas P. Georgiadis S. Tachakra D. Cavouras Department of Electrical and Computer Engineering Brunei University West London UK Medical Image and Signal Processing Laboratory Technological Educational Institute of Athens Athens Greece A&E Department North West London Hospitals NHS Trust Central Middlesex Hospital Central Middlesex Hospital London UK London UK

Recent advances in the hardware of handheld devices, opened up the way for newer applications in the healthcare sector, and more specifically, in the teleconsultation field. Out of these devices, this paper focuses on the services that personal digital assistants and smartphones can provide to improve the speed, quality and ease of delivering a medical opinion from a distance and laying the ground for an all-wireless hospital. In that manner, PDAs were used to wirelessly support the viewing of digital imaging and communication in medicine (DICOM) images and to allow for mobile videoconferencing while within the hospital. Smartphones were also used to carry still images, multiframes and live video outside the hospital. Both of these applications aimed at increasing the mobility of the consultant while improving the healthcare service.

关键词： Handheld computers Hospitals Personal digital assistants Medical services Wireless LAN Biomedical imaging Personnel Mobile handsets Smart phones Application software

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Corrections to “Design of Two-Dimensional Recursive Filters Using Genetic Algorithms”

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IEEE Transactions on Circuits and Systems I: Regular Papers 2004年第12期51卷 2516-2516页

作者： N.E. Mastorakis I.F. Gonos M.N.S. Swamy Department of Computer Science Hellenic Naval Academy Military Institutions of University Education Piraeus Greece High Voltage Laboratory of Athens National and Technical University of Athens Athens Greece Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

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A guard interval based frequency offset compensation scheme for MC-CDMA up-link 3

A guard interval based frequency offset compensation scheme ...

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3rd IEEE International Symposium on signal processing and Information Technology, ISSPIT 2003

作者： Mashury Ali, H. Communications and Signal Processing Group Department of Electrical and Computer Engineering Curtin University of Technology GPO Box U1987 PerthWA6845 Australia

ISBN: (纸本)0780382927

In this paper, a new frequency offset compensation scheme for up link of multicarrier code-division multiple access (MC-CDMA) systems is proposed. The proposed scheme exploits guard interval (GI) information embedded in MC-CDMA symbol blocks and is an extension of the work in F. Daffara and A. Chouly (May 1993). Simulation results show that the new scheme results in improved performance in MC-CDMA uplink. © 2003 IEEE.

关键词： Wireless sensor networks

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Novel registration technique for InISAR & InSAR

Novel registration technique for InISAR & InSAR

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2003 IEEE IGARSS: Learning From Earth's Shapes and Colours

作者： Zhang, Q. Yeo, T.S. Radar and Signal Processing Laboratory Department of Electrical and Computer Engineering National University of Singapore 10 Kent Ridge Crescent 119260 Singapore

In InISAR system, the pixels between two ISAR images derived from corresponding antennas usually do not register properly without prior compensation. A three-dimension motion compensation method, or 3D focusing, is put forward in this paper. With the multi-Antenna-pair configuration in radar system, the angular motion p arameters b oth in the a zimuth and p itching a re estimated accurately and the phase unwrapping processing can be avoided in the procedure of obtaining phase unambiguous. Simulation data is used to illustrate the accuracy of the proposed method. The method has also been extended to stripmap SAR for the interferometric 3D imaging of moving and/or man-made objects. © 2003 IEEE.

关键词： Motion compensation

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Recent Enhancements in CU VOCAL for Chinese TTS-enabled applications 8

Recent Enhancements in CU VOCAL for Chinese TTS-enabled appl...

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8th European Conference on Speech Communication and Technology, EUROSPEECH 2003

作者： Meng, Helen Li, Yuk-Chi Fung, Tien-Ying Ho, Man-Cheuk Keung, Chi-Kin Lo, Tin-Hang Lo, Wai-Kit Ching, P.C. Human-Computer Communications Laboratory Department of Systems Engineering Engineering Management Chinese University of Hong Kong Hong Kong Hong Kong Digital Signal Processing Laboratory Department of Electronic Engineering Chinese University of Hong Kong Hong Kong Hong Kong

CU VOCAL is a Cantonese text-to-speech (TTS) engine. We use a syllable-based concatenative synthesis approach to generate intelligible natural synthesized speech [1]. This paper describes several recent enhancements in CU VOCAL. First, we have augmented the syllable unit selection strategy with a positional feature. This feature specifies the relative location of a syllable in a sentence serves to improve the quality of Cantonese tone realization. Second, we have developed the CU VOCAL SAPI engine, a version of the synthesizer that eases integration with applications using SAPI (Speech Application Programming Interface). We demonstrate the use of CU VOCAL SAPI in an electronic book (e-book) reader. Third, we have made an initial attempt to use the CU VOCAL SAPI engine in Web content authored with Speech Application Language Tags (SALT). The use of SALT tags can ease the task of invoking Cantonese TTS service on webpages.

关键词： Application programming interfaces (API)

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Blind equalization of communication sequences based on optimization of cumulant criteria

Blind equalization of communication sequences based on optim...

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2003 IEEE Wireless communications and Networking Conference: The Dawn of Pervasive Communication, WCNC 2003

作者： Wu, Hsiao-Chun Xu, Dongxin Communications and Signal Processing Laboratory Dept. of Electrical and Computer Engineering Louisiana State University Baton RougeLA70803 United States BBN Technologies A Verizon Company 10 Moulton Street Cambridge02138 United States

ISBN: (纸本)0780377001

Blind equalization draws a lot of attention. Several statistical objective functions such as kurtosis and constant modulus were based on the noise-free model and hence their ISI cancellers were sensitive to noise. In this paper, a unifying adaptive blind equalization method is proposed, which can be robust to noise than the current cumulant-based adaptive methods. Our new objective functions can be applied for wired or wireless i.i.d. communication symbols with noise. The simulation shows that our new method outperforms the kurtosis-based method when the background noise exists. © 2003 IEEE.

关键词： Blind equalization

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