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共 2143 条记录，以下是2001-2010 订阅

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An enhanced method and behavioral model for noise cancellation in audio devices

An enhanced method and behavioral model for noise cancellati...

引用

2004 IEEE International Workshop on Biomedical Circuits and Systems

作者： Rana, Ram Singh Liang, Zhang Bin, Tang Krishna, Garg Hari Institute of Microelectronics 11 Science Park Road Singapore 117685 Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore 119260 Singapore Division of BioEngineering National University of Singapore Singapore 119260 Singapore

ISBN: (纸本)0780386655

In this paper, a beamforming based enhanced method for noise/echo cancellation in audio devices such as hearing aids is presented. A modified two-element beamformer scheme is proposed as a possible solution for better cancellation of noise. An equivalent behavioral model compatible with ADS (advance design system) CAD environment is provided. Simulations are carried out using MATLAB and ADS. Simulation results are observed in compliance with the modified two-element beamformer for noise cancellation and the equivalent behavioral model. The electrical equivalent of the proposed model is found compatible for the whole system simulation of biomedical devices, where noise cancellation is one of the critical concerns. © 2004 IEEE.

关键词： Noise abatement

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Contrast-detail analysis of a CMOS-based digital x-ray imaging system 19

Contrast-detail analysis of a CMOS-based digital x-ray imagi...

引用

19th International Conference on computers and Their Applications, CATA 2004

作者： Zhang, Qirong Li, Yuhua Steele, Ben Chen, Wei R. Wu, Xizeng Cheung, John Liu, Hong Center for Bioengineering School of Electrical and Computer Engineering University of Oklahoma NormanOK73019 United States Department of Physics and Engineering University of Central Oklahoma EdmondOK73034 United States Department of Radiology University of Alabama at Birmingham BirminghamAL35233 United States

ISBN: (纸本)9781618395511

A complementary metal-oxide semiconductor (CMOS)-based digital x-ray imaging system for small animal studies was developed. The core of this system is a unique detector module consisting of eight joint CMOS chips, each of which has a size of 512 x 1024 pixels with readout unit on the side. This system also employs an ultra-small x-ray source with a specially designed magnification configuration for high spatial resolution and high image contrast. The contrast details of the CMOS-based imaging system were studied using different phantoms. The results were compared with that of a CCD-based imaging system of similar design. Our studies indicated that the performances of the two systems are highly comparable in the range of x-ray exposure in our experiments. The images of fine structures of a mouse, acquired by the CMOS system, demonstrated the capability of the system in the studies of small animals. With integration potential, manufacturability, and low costs, the CMOS-based imaging systems could become widely used in animal studies and potentially become useful clinical tools for diagnosis. Copyright © (2004) by the International Society for computers and Their Applications. All rights reserved.

关键词： Imaging systems

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Functional optical coherence tomography of neurophysiology

Functional optical coherence tomography of neurophysiology

引用

Biomedical Topical Meeting, BIOMED 2004

作者： Boppart, Stephen A. Lazebnik, Mariya Vinegoni, Claudio Bowonder, Anupama Marks, Daniel L. Gillette, Rhanor Department of Electrical and Computer Engineering Beckman Institute for Advanced Science and Technology Bioengineering Program College of Medicine University of Illinois at Urbana-Champaign 405 N. Mathews Ave. UrbanaIL61801 United States Department of Electrical and Computer Engineering Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign United States Department of Molecular and Integrative Physiology University of Illinois at Urbana-Champaign United States

Functional optical coherence tomography (fOCT) is used to record optical changes that correspond to spontaneous and stimulated electrical activity in neural tissue. FOCT provides a high-resolution, real-time, non-inva... 详细信息

ISBN: (纸本)1557527695

关键词： Optical tomography

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MEG source estimation in the presence of low-rank interference using cross-spectral metrics

MEG source estimation in the presence of low-rank interferen...

引用

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

作者： D. Gutierrez A. Nehorai A. Dogandzic Department of Bioengineering University of Illinois Chicago IL USA Department of Electrical and Computer Engineering University of Illinois Chicago IL USA Department of Electrical and Computer Engineering Iowa State University IA USA

We estimate a source current dipole at a known location in the presence of low-rank interference using magnetoencephalography (MEG). We present a space-time processor for MEG data based on the generalized sidelobe canceler (GSC). We extend the classical vector beamformer to a matrix structure without making any assumptions on the rank of the covariance matrix of noise and interference, or constraint matrices. Furthermore, we define the cross-spectral metrics (CSM) in their most general form. The CSM method is known to approximate the performance of the matched filter for the case of unknown covariance matrix. In our case, the CSM also allows to reduce the complexity of the filtering problem without significant loss of performance in the signal-to-interference-plus-noise ratio (SINR). Our results show that good estimates of the dipole sources can be achieved by only using a few eigenvalues, namely, those corresponding to the largest CSM.

关键词： Covariance matrix Eigenvalues and eigenfunctions Sensor arrays Array signal processing Magnetoencephalography Signal to noise ratio Interference cancellation Matrix decomposition Performance loss Magnetic sensors

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Continuum model for acoustic phonons in nanotubes: Phonon bottleneck

Continuum model for acoustic phonons in nanotubes: Phonon bo...

引用

作者： Raichura, Amit Dutta, Mitra Stroscio, Michael A. Electrical and Computer Engineering University of Illinois at Chicago Chicago 60607 United States Department of Physics University of Illinois at Chicago Chicago 60607 United States Department of Bioengineering University of Illinois at Chicago Chicago 60607 United States

Elastic continuum model is used to model acoustic phonons in single wall nanotubes (SWNTs). Based on elastic continuum theory, acoustic vibrational modes are modeled for both zigzag and armchair nanotubes of finite length using a variational solution of Donnell's equation. The acoustic phonon modes in these calculations are determined for both even and odd modes of the acoustic displacement. The dispersion relations vary with the length of the tube, and the results indicate that phonon bottleneck effects occur in short SWNTs. The displacement field of the nanotube is used to calculate the deformation potential interaction Hamiltonian. © 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Carbon nanotubes

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Use of near-infrared fluorescent dyes in depth resolved spectroscopic optical coherence tomography

Use of near-infrared fluorescent dyes in depth resolved spec...

引用

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

作者： C. Xu J. Ye D.L. Marks S.A. Boppart Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana-Champaign IL USA Department of Electrical and Computer Engineering Department of Bioengineering University of Illinois Urbana-Champaign Urbana-Champaign IL USA

Optical coherence tomography (OCT) images of biological tissues often have low contrast. Spectroscopic OCT (SOCT) methods have been developed to enhance contrast. Due to the time-frequency "uncertainty principle" in SOCT signal analysis, minute spectral changes can not be detected for high spatial resolution applications. In order to enhance SOCT contrast in tissues with low inherent spectral absorption, we developed a contrast enhancing technique using near-infrared (NIR) dyes. We developed an optimized algorithm for SOCT and an optimum dye concentration for imaging. The effect of contrast enhancement was studied both in tissue phantoms and in situ experiments. Contrast-enhanced images are compared with fluorescence microscopy, demonstrating a link between SOCT and fluorescence imaging.

关键词： Fluorescence Spectroscopy Tomography Spatial resolution Biomedical optical imaging Optical imaging Signal resolution Biological tissues Time frequency analysis Uncertainty

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Reconstruction of 3D tooth images

Reconstruction of 3D tooth images

引用

2004 International Conference on Image Processing, ICIP 2004

作者： Buchaillard, S. Ong, S.H. Payan, Y. Foong, K.W.C. Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore Division of Bioengineering National University of Singapore Singapore Singapore TIMC/IMAG Laboratory UMR CNRS 5525 Université Joseph Fourier France Department of Preventive Dentistry National University of Singapore Singapore Singapore

We describe a novel approach to obtain a good estimate of the complete 3D representation of a tooth given only the crown. The technique is based on the use of a statistical model derived from 3D images of teeth constructed by microtomography. The root is constructed by matching the respective crowns of the two models, defining the optimal registration, and optimizing the statistical model parameters. This method allows us to generate the root efficiently due to the small number of parameters to adjust, and requires little or no interaction from the user. The resultant 3D model is smooth and provides a good approximation of the root shape. © 2004 IEEE.

关键词： Image reconstruction

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A generalized optical theorem for electromagnetic fields in a half space

A generalized optical theorem for electromagnetic fields in ...

引用

Frontiers in Optics, FiO-2004

作者： Lytle, D.R. Carney, P. Scott Schotland, John C. Wolf, Emil Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign UrbanaIL61801 United States Department of Electrical and Computer Engineering The Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign UrbanaIL United States Department of Bioengineering University of Pennsylvania PhiladelphiaPA19104 United States Department of Physics and Astronomy The Institute of Optics University of Rochester RochesterNY14627 United States The School of Optics CREOL University of Central Florida OrlandoFL32816 United States

Expressions for the electromagnetic power extinguished by a scatterer in a half-space are derived via the generalized optical theorem. The power is seen to be related to the structure of the scattering object. Applica... 详细信息

ISBN: (纸本)1557527792

关键词： Electromagnetic fields

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A multimedia system for remote neurosurgical monitoring

A multimedia system for remote neurosurgical monitoring

引用

IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)

作者： Mingui Sun Qiang Liu Jian Xu Bing Liu Chengquan Hu A. Kassam R.J. Sclabassi Department of Neurosurgery Electrical and Computer Engineering and Bioengineering University of Pittsburgh Pittsburgh PA USA Department of Neurosurgery Electrical and Computer Engineering University of Pittsburgh Pittsburgh PA USA Department of Neurosurgery University of Pittsburgh Pittsburgh PA USA

Neurophysiological intraoperative monitoring (IOM) is an important tool aimed at reducing iatrogenic injury to the central nervous system during complex surgical procedures. We utilize multimedia techniques involving digital video to perform remote IOM. A video camera mounted on a microscope records the same surgical scene as the one observed by the neurosurgeon. The recorded video along with a variety of physiological data are processed, compressed, and transmitted through networks to be monitored by neurophysiologists at remote sites. In order to reduce bandwidth without degenerating video quality in critical areas of the surgical field, we utilized a novel method based on the wavelet transform to decompose each video frame into subframes and encode them in different resolutions. Our experimental results have demonstrated the effectiveness of this method.

关键词： Multimedia systems Neurosurgery Remote monitoring Video compression Surgery Injuries Central nervous system Cameras Microscopy Layout

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Programmable arbitrary waveform generator for internal defibrillation research

Programmable arbitrary waveform generator for internal defib...

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

作者： D.J. Dosdall D.E. Rothe J.D. Sweeney Harrington Department of Bioengineering Arizona State University Tempe AZ USA Department of Electrical Engineering and Computer Science Milwaukee School of Engineering Milwaukee WI USA

A programmable arbitrary waveform generator for creation of experimental defibrillation shocks is described. The system is capable of delivering shocks for internal defibrillation via 10 channels at 1000 Volts and 30 Amps. A microcontroller driven system that can receive waveform commands from a laptop was designed to be able to deliver shocks to any combination of electrodes. Waveforms are controllable down to 100 microsecond intervals and each channel is capable of serving as anode or cathode. This system can be used to verify predictions for defibrillation waveform efficacy as predicted by modeling efforts or to test new experimental waveforms tuned to parameters from an individual subject.

关键词： Signal generators Defibrillation Electric shock Microcontrollers Portable computers Electrodes Anodes Cathodes Predictive models System testing

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