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Response detection in narrow-band EEG using signal-driven non-periodic stimulation

Response detection in narrow-band EEG using signal-driven no...

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13th Mediterranean Conference on Medical and Biological engineering and Computing 2013, MEDICON 2013

作者： Cagy, M. Infantosi, Antonio Fernando Catelli Biomedical Engineering Program/Coppe Federal University of Rio de Janeiro Rio de Janeiro Brazil

ISBN: (纸本)9783319008455

Statistical Objective Response Detection (ORD) Techniques applied to Evoked Potentials usually depend on the effective Number of Degrees of Freedom (NDOF) of spontaneous EEG. Previous works proposed a method for estimating the NDOF of the Evoked Potential Detector (EPD) probability distribution under the null hypothesis of no response, based on the EEG autocorrelation function (ACF) when EEG is modeled as a wide-or narrow-band colored noise. Considering narrow-band EEG, the use of Beta distribution based on NDOF estimates via ACF is able to reflect EPD distribution provided that the stimulation rate is non-uniform. The present work assesses a simple real-time criterion based on FFT for randomizing the inter-trial interval using Monte Carlo simulation for several combinations of EEG bandwidths, central frequencies, numbers of epochs and number of samples per epoch. The results suggest such approach as a valid algorithm to be implemented in the development of specific devices to produce random inter-stimuli intervals. © Springer International Publishing Switzerland 2014.

关键词： Intelligent systems

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Evaluation of heating patterns generated by therapeutic ultrasound insonation in muscle phantoms

Evaluation of heating patterns generated by therapeutic ultr...

引用

Pan American Health Care Exchanges, PAHCE 2011 - Conference, Workshops, and Exhibits. Cooperation / Linkages: An Independent Forum for Patient Care and Technology Support

作者： Basto, R.L.Q. Amorim, N.S. Monteiro, E.R. Quaresma, J.N.N. Cotta, R.M. Von Kruger, M.A. Pereira, W.C.A. POLI and COPPE/UFRJ LTTC - Laboratory of Transmission and Technology of Heat Mechanical Engineering Program Rio de Janeiro Brazil COPPE/UFRJ Laboratory of Ultrasound Biomedical Engineering Program Rio de Janeiro Brazil

ISBN: (纸本)9781612849164

The present work aims at studying the effect of heating patterns generated by therapeutic ultrasound (US) insonation on tissue mimicking device called Phantom. With this purpose, it was constructed a cylindrical calorimeter (80 mm height and 42 mm diameter) which was filled with muscle mimic phantom, for acquisition of temperature an array of thermocouples was placed at 2 and 6 cm depth. Ultrasound physiotherapy equipment was used at two therapeutic frequency (1 and 3 MHz), three intensities, and continuous irradiation mode and applied for 300s static mode. The experimental temperatures elevation profiles in Phantom were compared to a 2D bio-heat equation model, permitting a critical evaluation of such experimental data. The acoustic heating model was based on the US absorption equation, assuming linear propagation and neglecting stationary wave and multiplie reverberation effects. The comparison between experimental and mathematical simulation for the central thermocouple showed that, for far field the correlation between the experimental and simulated values are higher than for the near field. © 2011 IEEE.

关键词： Phantoms

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Arrhythmia analysis using artificial neural network and decimated electrocardiographic data

Arrhythmia analysis using artificial neural network and deci...

引用

Computers in Cardiology 2000

作者： Melo, S.L. Calôba, L.P. Nadal, J. Electrical Engineering Program COPPE Federal University of Rio de Janeiro Rio de Janeiro Brazil Biomedical Engineering Program COPPE Federal University of Rio de Janeiro Rio de Janeiro Brazil Biomedical Engineering Program COPPE Federal University of Rio de Janeiro P.O. Box 68510 21945-970 - Rio de Janeiro - RJ Brazil

This work shows an Artificial Neural Network using the Kohonen Layer architecture in a modified approach to support supervised learning, and the evaluation of its performance in the classification of QRS complexes of the Electrocardiogram (ECG) from patients with cardiac arrhythmias. A second aim of this study was to investigate the ability of ANN to classify QRS complexes when the original data samples are used as input variables. The classifier was developed and tested with the MIT-BIH Arrhythmia Database. The obtained results become equivalent to the most sophisticated methods in the literature when input data are properly pre-processed and the final classifier is allowed to adapt to the normal pattern of each analyzed patient.

关键词： Cardiology

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ECG data compression using wavelets

ECG data compression using wavelets

引用

Computers in Cardiology 2000

作者： Chagas, A.V. Da Silva, E.A.B. Nadal, J. Biomedical Engineering Program COPPE Federal University of Rio de Janeiro Rio de Janeiro Brazil Electrical Engineering Program COPPE Federal University of Rio de Janeiro Rio de Janeiro Brazil Biomedical Engineering Program COPPE Federal University of Rio de Janeiro P.O. Box 68510 21945-970 - Rio de Janeiro - RJ Brazil

This work aims to apply the discrete biorthogonal wavelet transform and adaptive arithmetic encoding (AAE) for ECG data compression. Using the 9-7 linear phase biorthogonal wavelet and symmetric extension at the signal boundaries, the number of subband samples required for synthesis becomes the same as the ones of the original data. The encoding EZW algorithm was used to explore the similarities between subbands, and AAE to represent the generated symbols with a rate close to its entropy. Such method was applied to MIT-BIH Arryhythmia Database (24 Hs, 2 channels of data sampled with a 360 Hz with 11 bits), for different compression ratios (CR). Fixing CR to 12:1, the data shape is preserved. The obtained PRD, 3.58±1.56% (mean±standard deviation), indicates the suitability of the method.

关键词： Electrocardiography

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A microcomputer-based system for mapping EEG signals after source derivation

A microcomputer-based system for mapping EEG signals after s...

引用

1990 IEEE Colloquium in South America, COLLOQ 1990

作者： Infantosi, A.F.C. Almeida, A.C.G. Biomedical Engineering Program COPPE/UFRJ P.O. Box 68510 Rio de Janeiro21945 Brazil

ISBN: (纸本)0879426101

A microcomputer-based system for mapping the brain electrical activity after source derivation has been developed. The EEG data are obtained as a set of up to 16 unipolar derivations, sampled and displayed in real time, before storing on disk. The data is also available for processing and may be displayed as a Compressed Spectral Array or in topographic maps. The Source Derivation Technique counteracts the smearing of the electrical fields as measured on the scalp and thus improves the spatial selectivity of mapping. It is calculated using the finite difference method, assuming a uniform grid of electrodes or alternatively a non-uniform grid. Source derivation is applied to the data before estimating the power spectral density function (using FFT) from selected epochs of the signals. Spectral parameters can then be extracted and mapped on a surface corresponding to the lateral projection of a brain hemisphere. Spatial interpolation is employed to estimate the parameter values at points where no electrodes are located. The brain topograms are then exhibited on the computer monitor. The software was written in PASCAL with time-critical routines in Assembly. The system may be readily upgraded as improved hardware becomes available and further software can be added to fit developing requirements. This system is an invaluable tool for research and teaching, but may also be applied during routine clinical investigation. © 1990 IEEE.

关键词： Brain

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Computational simulations of time of flight and attenuation of first arriving signal from healing process of diaphyseal femur fractures.

Computational simulations of time of flight and attenuation ...

引用

21st International Congress on Acoustics, ICA 2013 - 165th Meeting of the Acoustical Society of America

作者： Rosa, Paulo Tadeu C. Fontes-Pereira, Aldo J. Pereira, Wagner C. COPPE - Biomedical Engineering Program Federal University of Rio de Janeiro Rio de Janeiro 21941-914 Brazil

Quantitative Ultrasound (QUS) has been proposed to evaluate structural conditions from bone tissue in a non-invasive way. These techniques are based on the fact that the ultrasound propagation depends directly of tissues structures, so, they carry information about them. Based on these arguments, the aim of this work was to estimate the time-of-flight (TOF) and attenuation of The first arriving signal (FAS) using computational simulations (Wave2000® CyberLogic, inc., NY, EUA) in an axial transmission model in different kinds of fracture, during the healing process. In this work we used QUS techniques to analyze the fracture healing process. The FAS has been chosen because it does not suffer interference of other waves since it is the first signal to arrive at the receiver. TOF increases immediately after bone fracture. When bone tissue starts to consolidate, TOF decreases and stabilizes with the same value of the intact bone. Attenuation is bigger in oblique and spiculate fracture than transversal ones for the same stage which suggests that attenuation is sensitive to the kind of fracture. Other studies are being conducted to clarify this point. © 2013 Acoustical Society of America.

关键词： Bone

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Evaluating pharmaceutical assistance activities in Brazilian hospitals

Evaluating pharmaceutical assistance activities in Brazilian...

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Pan American Health Care Exchanges, PAHCE 2011 - Conference, Workshops, and Exhibits. Cooperation / Linkages: An Independent Forum for Patient Care and Technology Support

作者： Nascimento, A. Castilho, S.R. Almeida, R.M.V.R. Infantosi, A.F.C. Biomedical Engineering Program /COPPE UFRJ Rio de Janeiro Brazil Pharmacy Faculty UFF Niterói Brazil

ISBN: (纸本)9781612849164

This work aims at identifying and evaluating the associations between the pharmaceutical assistance activities in hospital pharmacies services (HPS). The Multiple Correspondence Analysis (MCA) was applied to a sample of 238 hospitals and 30 variables from the survey Diagnosis of Hospital Pharmacy in Brazil. The first dimension of the MCA explained 90.6% of the data variability and allowed discriminate the HPS according to the presence or not of activities. It is noticeable an association between the presence of activities and better categories with large hospitals. © 2011 IEEE.

关键词： Hospitals

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PHASE AND AMPLITUDE SPECTRA IN THE ANALYSIS OF SIGNAL PEAK LATENCY 14

PHASE AND AMPLITUDE SPECTRA IN THE ANALYSIS OF SIGNAL PEAK L...

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14TH ANNUAL INTERNATIONAL CONF OF THE IEEE engineering IN MEDICINE AND BIOLOGY SOCIETY

作者： DACOSTA, CCA SIMPSON, DM INFANTOSI, AFC Biomedical Engineering Program COPPE Federal University of Rio de Janeiro C.P. 68510 Rio de Janeiro 21944 Brazil

ISBN: (纸本)0780307852

In the search for parameters to quantify clinically significant characteristics of signal shape (for example in evoked potentials), the Fourier Transform has been employed, with the amplitude spectrum having received main attention. However, the phase spectrum appears to be more closely linked to signal shape and principally peak latency. In this paper the still poorly explored relative roles of the two parts of the spectrum in determining transient signal morphology is investigated.

关键词： Electrophysiology

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A brief profile of biomedical engineering education in Latin America

A brief profile of biomedical engineering education in Latin...

引用

World Congress on Medical Physics and biomedical engineering

作者： Mestas, C.A. Infantosi, A.F.C. Nascimento, L.N. Calil, S.J. Department of Biomedical Engineering School of Electrical and Computer Engineering University of Campinas Campinas Brazil Biomedical Engineering Program COPPE Federal University of Rio de Janeiro Rio de Janeiro Brazil

ISBN: (纸本)9783642293047

biomedical engineering has been an important ally to Medicine in providing new technologies for healthcare. Nevertheless, biomedical engineering Education is not provided homogeneously around the world and it may present relevant differences even among neighboring countries. A survey was conduct in Latin America to identify the major characteristics of biomedical engineering Education in that region. In the educational programs on the three academic levels (under-graduation, MSc and PhD) of the responding institutions, there are similarities in several topics present in each academic curriculum and in some research areas. To obtain a more accurate profile of biomedical engineering Education in Latin America, it will be required an even more detailed questionnaire and higher response rates. © 2013 Springer-Verlag.

关键词： biomedical engineering

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Computerized simulation of breast ultrasound images

Computerized simulation of breast ultrasound images

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Pan American Health Care Exchanges, PAHCE 2011 - Conference, Workshops, and Exhibits. Cooperation / Linkages: An Independent Forum for Patient Care and Technology Support

作者： Gomez, W. Pereira, W.C.A. Infantosi, A.F.C. Diaz-Perez, A. Information Technology Laboratory CINVESTAV-IPN Ciudad Victoria Mexico Biomedical Engineering Program COPPE-UFRJ Rio de Janeiro Brazil

ISBN: (纸本)9781612849164

The present article proposes a methodology for simulating breast ultrasound (BUS) images for assessing segmentation algorithms. The main characteristics of the simulated BUS images are: (i) building an echogenicity map containing common tissues found in real breasts as well as their geometries and (ii) simulating the physical process of image acquisition. The validation procedure is based on measuring the correlation between the theoretical Rayleigh probability density function (PDF) with the one obtained from simulated speckle textures. The results pointed out that the PDF derived from simulated images are strongly correlated with the theoretical PDF with a coefficient of correlation of 0.999. © 2011 IEEE.

关键词： Speckle

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