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Biomedical subjects

S V Selishchev

Publications and source records attributed to S V Selishchev.

18 recordsLinked to original sources
PubMed2002

Design of acquisition devices management subsystem for IEEE 1073 compliant software agents.

The paper addresses the issue of device management system design for software agents compliant with IEEE 1073 device communication standard. Based on middleware architecture the device control layer represents a universal versatile object-oriented application-programming interface. The approach presented in the paper allows to implement plug-and-play integration and interoperability of medical acquisition devices within the medical device system be means of common middleware services. Adherence to Medical Data Information Base nomenclature, component part of IEEE 1073 communication standard, adds necessary consistency to presented component-based infrastructure.

Electrocardiography↗
PubMedDate not supplied

[Construction of pulse oximeters based on sigma-delta transducers].

The method of continuously measuring arterial blood saturation (pulse oximetry) has been recently intensively developed. The paper proposes a new schematic design of pulse oximeters based on the current multiple-digit sigma-delta transducers which reduces expenses connected with device operation, simplifies the regimen and algorithms of control, increases the quality of data reading.

Algorithms↗
PubMedDate not supplied

[Standard SCP-ECG in programmed systems of electrocardiography].

The paper describes the main features of the standard SCP-ECG that establishes a unified protocol for ECG data transmission both between the digital electrocardiograph and the computer control system and between the computer systems made by different manufactures. The paper also shows how to use via componential COM-technology a package of programme modules that support the input and output of electrocardiographic data in conformity with SCP-ECG.

Electrocardiography↗
PubMedDate not supplied

[Models of radiation dispersion in medical laser tomographic system].

The prospects for developing a new noninvasive medical diagnostic technique, such as optical (laser) tomography of biological tissues largely depend on the feasibility of designing an adequate mathematical model for the reconstruction of images of the spatial structure of objects that are in the highly scattering medium (HSM). The basic difficulty is that it is necessary to effectively describe the physical properties and the propagation pattern of photons of different types in such a medium. This review considers methods for describing the distribution of laser ultrashort pulses in HSM with particular emphasis on a new nonstationary two-flux model of radiation transfer.

Diffusion↗
PubMedDate not supplied

[Use of multimedia serial USB interface in computer medical complexes].

At present, personal computers (PC) are most available multimedia devices and used in the design of medical complexes. A problem occurs while choosing a device PC interface. The paper considers a USB interface and the use of its based computer medical complexes. A lot of advantages provided by the new interface, low cost and high efficiency make it possible to design up-to-date devices having high consumer qualities.

Computer Systems↗
PubMedDate not supplied

[A program package of collection and mathematical processing of ECG data on the basis of COM architecture].

The paper deals with general questions of the Component Object Model (COM) architecture for ECG software applications. Here their common structure is presented, the benefits and constraints of component-based applications are considered. Being a component model, COM allows one to build any application the functionally complete modules. Each module is developed by the particular protocol that gives developers a possibility to provide effective interoperability between such components. The separate part of the article is devoted to reliability and performance issues of the component-based ECG applications. The approach described in this article permits one to solve a number of problems facing medical software developers by using the effective and flexible component architecture. As implementation of the discussed architecture, a software ECG system being developed by a team of authors is presented.

Computer Systems↗
PubMedDate not supplied

[Specific features of QRS-complex identification algorithms for real-time ECG systems].

The paper reviews the existing methods for identifying QRS complexes. An attempt is made to make a well-defined classification of available algorithms in an approach to QRS detection. Emphasis is laid on the consideration of specific requirements for such algorithms by computer-aided real-time ECG systems. A task of choice of the most suitable method is formulated. An algorithm based on the well-known principles of frequency-time detection is proposed as an alternative solution of this task. The algorithm makes it possible to single out QRS complexes from real-time ECG and to effectively make a digital signal processing by available optimized libraries. The method initially used in the Matlab package has been integrated within the laboratory computerized ECG system.

Algorithms↗
PubMedDate not supplied

[Integration of fundamental and applied medical and technical research made at the department of the biomedical systems, Moscow State Institute of Electronic Engineering].

The integration results of fundamental and applied medical-and-technical research made at the chair of biomedical systems, Moscow state institute of electronic engineering (technical university--MSIEE), are described in the paper. The chair is guided in its research activity by the traditions of higher education in Russia in the field of biomedical electronics and biomedical engineering. Its activities are based on the extrapolation of methods of electronic tools, computer technologies, physics, biology and medicine with due respect being paid to the requirements of practical medicine and to topical issues of research and design.

Academies and Institutes↗
PubMedDate not supplied

[Passive propagation of the transmembrane potential induced by the capacities of the myocardium bioelectrolytes in its electric defibrillation].

The mechanism of passive propagation of transmembrane potential (TMP), caused by the availability of their own electric capacities in bioelectrolytes, is elucidated within the framework of the bi-domain description of the myocardium electrophysiological properties. The above mechanism is related with the possibility of the external and internal bioelectrolytes and has, in respect to each other, electric charges unbalanced by their absolute capacity; it is explained by the ability of such charges to diffuse rapidly enough through bioelectrolytes and, owing to their electric induction, to intensify the TMP.

Computer Simulation↗
PubMedDate not supplied

[Comparison of the efficiency and noise-immunity of the algorithms detecting the shock cardiac rhythms].

Comparative assessments of the efficiency and noise immunity of the algorithms detecting the shock cardiac rhythms (SCR) are described in the paper. It is suggested to use the rejection filter of ventricular fibrillation as the principle algorithm for the SCR detection in an automated external defibrillator. The use of the method combining the after-threshold interval and the method of spectral analysis is demonstrated to be preferable for a portable external defibrillator.

Algorithms↗
PubMedDate not supplied

[A telemedicine electrocardiography system based on the component-architecture soft].

The paper deals with a universal component-oriented architecture for creating the telemedicine applications. The worked-out system ensures the ECG reading, pressure measurements and pulsometry. The system design comprises a central database server and a client telemedicine module. Data can be transmitted via different interfaces--from an ordinary local network to digital satellite phones. The data protection is guaranteed by microchip charts that were used to realize the authentication 3DES algorithm.

Blood Pressure Determination↗
PubMedDate not supplied

[An integral chip for the multiphase pulse-duration modulation used for voltage changer in biomedical microprocessor systems].

An integral chip (IC) was designed for controlling the step-down pulse voltage converter, which is based on the multiphase pulse-duration modulation, for use in biomedical microprocessor systems. The CMOS technology was an optimal basis for the IC designing. An additional feedback circuit diminishes the output voltage dispersion at dynamically changing loads.

Biomedical Engineering↗
PubMedDate not supplied

[A monitor of the biomechanical cardiac activity].

A monitor of the biomechanical cardiac activity is described, which was elaborated on the basis of the accelerometer sensor and sigma-delta ADC for the purpose of registering the ballistocardiograms and seismocardiograms. The device ensures a non-stop signal recording for as long as 8 hours with the data being preserved in an inbuilt memory. Data are fed to the computer through the USB port. An algorithm is suggested for recordings processing by using the neuron-net technologies.

Algorithms↗
PubMedDate not supplied

[Experimental determination of radiation scattering and absorption coefficients in a homogeneous layer of highly-dispersive biological medium].

A method for experimental determination of optical characteristics of a highly-dispersive medium (radiation scattering and absorption coefficients) is described. The method is based on two mathematical models of ultrashort laser pulse propagation through a highly-dispersive medium (HDM), an axial model and a diffusion model. Milk dissolved in water was used as HDM. Dependences of optical characteristics of HDM on the concentration of milk in water are obtained. The limits of applicability of the axial and diffusion models to media with different scattering and absorption characteristics are determined.

Animals↗
PubMedDate not supplied

[The DICOM standard in computer-assisted medical technologies].

The paper outlines one of the promising standards to transmit images in medicine, in radiology in particular. The essence of the standard DICOM is disclosed and promises of its introduction into computer-aided medical technologies.

Computer Communication Networks↗
PubMedDate not supplied

[The use of sigma-delta analog-digital conversion in multichannel electrocardiographs].

With advances in the manufacture of super great integrated circuits, a commercially available element base that realizes the sigma-delta (sigma-delta) analog-to-digital conversion principle in one microcircuit has appeared. The sigma-delta analog-to-digital converters (ADC) have a high resolving power (above 12 bits), they are largely based on the signal digital filtration principles, which may moderate requirements for the analog filtration of signals and use direct-current amplifiers as alternatives to instrument ones. For electrocardiograph operation, the sigma-delta ADC of an AD 7716 (Analog Devices) with 22 bits were used in this study. The use of sigma-delta ADC in the electrocardiographs has been shown to be a rather useful alternative of traditional ADC. Moreover, sigma-delta ADC may be also useful for other systems for collecting and processing biomedical signals which are close in their requirements for a frequency range and a dynamic range, i.e. encephalographic, myographic, rheographic and other input signals.

Analog-Digital Conversion↗