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Analysis of the human center of pressure (COP) trajectory allows quantification of the state of the postural controI system. In our consideration, as a model of COP sway, Langevin equation has been accepted. Using an analysis based on this equation, the friction coefficient and diffusion matrix have been obtained. The diffusion matrix is analysed using its trace, the angle, of rotation of the coordinate...
Co-registration of different types of studies into one multimodal image is a very powerful tool which provides more (complementary) information than both studies analyzed separately. The aim of this paper is to demonstrate the importance and to provide a measure of quality control in SPECT-CT studies. The resuIt of image fusion has a diagnostic value only when precision of co-registration is known...
This paper presents a practical approach to handwritten signature recognition. The biometric system was designed by means of the single-output multilayer perceptrons (MLP). The signatures were acquired using a digitizing tablet which captures information about the signing process, like the pen tip position (x,y), pen tip pressure and pen azimuth, and altitude angles. Both the identification and signature...
In our study, the influence of culture conditions (monolayer and 3D Matrigel) of hepatocyte cell line (buman hepatoma cell line, HepG2) on their metabolic activity was assessed. Albumin synthesis by HepG2 cells was significantly higher in Matrigel culture as compared to monolayer culture of the cells. 3D culture improved urea production by HepG2 cells. The detoxification experiments revealed that...
The aim of this project was to create a tool for improvement of microemulsions formulation process. Microemulsions are promising drug forms allowing for improvement of solubility and enabling controlled release of drugs. As a modeling tool, artificial neural networks (ANNs) were chosen. ME _expert system was created basing on the neural expert committee constructed of 11 neural models. ANN were designed...
A new approach to texture characterization from dynamic CT scans of the liver is presented. Images with the same slice position and corresponding to three typical acquisition phases are analyzed simultaneously. Thereby texture evolution during the propagation of contrast product is taken into account. The method is applied to recognizing hepatie primary tumors. Experiments with various sets of texture...
The therapy of stuttering people is a time-consuming and long-Iasting process which requires a great effort both from the logopaedist and patient. The process can be divided into three parts: recording of patient's utterances (reading, telling, conversation), 20-minute corrective exercises with the echo (reading, tell ing) and individual work of the stuttering person with difficult words. All of these...
The main purpose of this paper is to present some advantages of nonlinear filtering of biomedical signals. The nonlinear M-filters are considered in this paper to suppress specific kind of noise - an impulsive noise in high resolution ECG signal. The impulsive noise can be modeled by symmetric \alfa-stable distribution (S\alfaS). The following type of M-filters are used in this work: median filter,...
This paper presents a concept of the multi-Ievel control system for the Minimally Invasive Surgery (MIS). The robot assistant has been proposed to help the surgeon in the laparoscopic cholecystectomy. The ASYSTENT system is the result of the cooperation between Chair of ControI and Systems Engineering, Poznań University of Technology, and The Department of General and Laparoscopic Surgery, Hospital...
Precise and cheap methods for fast detection of drugs for the purposes of administration of appropriate medication are of paramount importance in clinical practice. Nowadays, many pharmaceutics with a high toxicity and narrow margin of safety are applied, so they should be delivered very precisely. Electrochemical methods have been used to determine the concentration of benzodiazepines, phenothiazines...
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