O4-1 Model of tissue layers in the bioimpedance spectroscopy, Airat GALIAMOV

This paper addresses the problem with spatial distribution of tissue properties and its influence on results of bioimpedance spectroscopy analysis. We use a horizontally stratified half-space model of the object with subcutaneous fat and underlying muscle layers, to show that neglecting the difference in properties between tissues leads to erroneous predictions of the object composition. These results may be useful for improving methods in future localised bioimpedance studies in choosing an appropriate electrode system.

O4-2 Occupational health damages caused by electromagnetic radiation of extremely low frequencies, Jovica JOVANOVIĆ, Dejan KRSTIĆ, Dušan SOKOLOVIĆ and Milica JOVANOVIĆ

A large number of people who work on servicing of these plants and devices are exposed to electromagnetic fields. As a result, a warning has been issued about the frequent occurrence of malignant diseases, psychological disorders, genetic material damage, cardiovascular, nervous, hematopoetic system, metabolism and the occurrence of miscarriages in the exposed population.

O4-3 Assessment of age-related skin temperature changes in the parotid and submandibular region in the healthy people using thermal imaging camera, Andrija ĆOSIĆ, Igor JOVANOVIĆ, Miona ANDREJEVIĆ STOŠOVIĆ, Dragan KRASIĆ and Dragan MANČIĆ

Infrared thermography is an affordable, non-contact, non-invasive diagnostic technique. It may be easily accessible to a significant population, which satisfies the prerequisites for a screening method for tumour detection. However, it is still not utilised for regular clinical diagnosis, mainly due to the difficulty of extracting the needed data. This study aims to evaluate the influence of age on the temperature differences of healthy people in the parotid and submandibular regions.

O4-4 Additional experimental investigation of interval overlapping method for biomedical signal measurement, Jelena ĐORĐEVIĆ KOZAROV, Platon SOVILJ, Milan SIMIĆ, Marjan UREKAR, Milica STOJANOVIĆ and Dragan ŽIVANOVIĆ

In order to design and realize the computer based instrument for stochastic measurement of non-stationary biomedical signals, an experimental hardware solution has been deveoped. The overlapping interval method, that is used in this research, is based on stochastic analog-to-digital conversion, with a low-resolution A/D converters and accumulation. As an example of nonstationary signal, the electrooculography signal was used. Due to the limited speed of data transfer between PC and the PSB, the possibility of measuring a minor number of Fourier coefficients was investigated. The results were compared with the results obtained by measuring a larger number of Fourier coefficients and by classical digital measurement. The obtained results are presented, analyzed and discussed.

O4-5 Customized differential microvolt preamplifier for measurements of biomedical signals, Marjan UREKAR, Jelena ĐORĐEVIĆ KOZAROV and Zdravko GOTOVAC

Commercially available Differential Preamplifiers are based on high-quality Instrumentation Amplifiers, but due to their universal nature, they are not adjusted to fit all needs that exist for Biomedical Measurements. This paper covers customization techniques of a standard Differential Preamplifier in order to improve its characteristics and to fine tune it to specific of measurements of biopotentials in microvolt range.