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Wyświetlanie 1-15 z 17
Tytuł:
Adaptation of the region-merging method in image segmentation
Autorzy:
Lamża, A.
Wróbel, Z.
Powiązania:
https://bibliotekanauki.pl/articles/333894.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
adaptacyjna metoda segmentacji obrazu
metoda łączenia obszarów
adaptive image segmentation
region-merging method
Opis:
In this paper a new method of automatic image segmentation is presented. In proposed approach a region merging method is applied, where pixels or pixel groups are merged to bigger areas. In the proposed method of the region merging seed settings, segmentation parameter definition, and number of outcome areas determining can be omitted. Homogeneous clusters (consisting of continuous groups of pixels) are the part of the growth process. The clusters are merged when the homogeneousness condition is fulfilled. The threshold value changes during segmentation process, appropriate to the changeable conditions.
Źródło:
Journal of Medical Informatics & Technologies; 2007, 11; 205-212
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The wireless transmission system for medical evidences collections
Autorzy:
Sapota, G.
Wróbel, Z.
Powiązania:
https://bibliotekanauki.pl/articles/333993.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
system transmisji telefonu GPRS
jednoukładowy kontroler
data transmission system GPRS telephone
single-chip controller
Opis:
This work introduces a cheap system of data sending through the internet services using the telephone installed in GPRS system. The system enables sending data with the speed up till 115,2 kbps, where only the quantity of data instead of the time of connection with net is to be paid for. The basis of an introduced system is the Time Port Motorola Telephone as well as the system based on the processor 8051. The described device is universal and may serve for sending such data as: the current position (of persons, vehicles etc), meteorological data, data records of working devices in a given place, biomedical information in monitoring of treated patients or persons undergoing clinical tests in movement.
Źródło:
Journal of Medical Informatics & Technologies; 2003, 6; IT111-116
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulating electrical potential distribution by using "Spice" for electrical impedance tomography
Autorzy:
Biały, S.
Wróbel, Z.
Powiązania:
https://bibliotekanauki.pl/articles/333653.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
elektryczna tomografia impedancyjna
zagadnienie proste
electrical impedance tomography
forward problem
model spice
Opis:
In this paper solution of straight problem was introduced in electrical impedance tomography with help of method of junction's potentials with utilisation of computer program "Spice". Preliminary investigations of model were introduced based on mesh of resistance artificially disturbances of schedule of resistance. Created images of boundary potentials permit onto estimation of errors introduced through model.
Źródło:
Journal of Medical Informatics & Technologies; 2002, 4; MT131-136
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The EKG signal measurement and the influence of alpine conditions on heart actions
Autorzy:
Sapota, G.
Wróbel, Z.
Powiązania:
https://bibliotekanauki.pl/articles/333688.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
EKG
GPRS
Opis:
This work presents the possibility of measuring heart action parameters in the alpine conditions as well as the measuring system, which helps to measure and transmit EKG signal with the aid of GPRS net. The GPRS transmission makes the estimation of heart action on - line possible. Thanks to it, it is possible to monitor the reaction of human organism being on a certain level of height. GPRS net application enables the measuring in the whole world. The charge for using this net is only dependent on the quantity of transmitted data which needs the signal compression. This work also mentions the possibility of compression use, which takes the advantage of temporal and frequency decomposition.
Źródło:
Journal of Medical Informatics & Technologies; 2004, 7; KB99-103
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of selected face areas on thermograms with elimination of typical problems
Autorzy:
Marzec, M.
Koprowski, R.
Wróbel, Z.
Powiązania:
https://bibliotekanauki.pl/articles/333085.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
obrazy termowizyjne twarzy
termogramy
algorytm
analiza obrazu
segmentacja
analiza twarzy
wykrywanie twarzy
wykrywanie charakterystycznych cech twarzy
face thermovision images
thermograms
algorithm
image analysis
segmentation
face analysis
face detection
detection of characteristic face features
Opis:
The paper presents an algorithm enabling a fully automatic detection of characteristic areas on thermograms containing patients' faces in a front projection. A resolution of problems occurring at the segmentation of face images, such as a change of position, orientation and scale, has been proposed. In addition, attempts to eliminate the effect of the background and of disturbances caused by the haircut and the hairline were made. The algorithm may be used to detect selected points and areas of a face or as a preliminary component in the face recognition, as a development of optical analysis methods or in the quantitative analysis of face on thermograms.
Źródło:
Journal of Medical Informatics & Technologies; 2010, 16; 151-159
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of the reaction of X-ray radiation with an object while densitometry tests
Autorzy:
Binkowski, M.
Dyszkiewicz, A.
Wróbel, Z.
Powiązania:
https://bibliotekanauki.pl/articles/333342.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
badanie densytometryczne
tkanka kostna
gęstość mineralna kości
densitometry test
bone tissue
bone mineral density
simulation of absorption law
Opis:
The computer modelling of absorption effect of X-ray radiation in the bone tissue was analysed. An image, which is produced as a result of X-ray absorption was computed based on the absorption law. The simulation enables to define dimensions and resolution of space where the experiment will be realised. A model of a sample contains information about its geometry and distribution of density. It can be made as simple solids or loaded from external source, like files. This method may be useful to load information about bone microstructure into the simulation space. A source of X-ray radiation was defined as a plate, which has initial radiation intensity. Rules of radiation propagation were simplified to straight model where radiation propagates in the direction perpendicular to the surface of detector which records an image. The image is generated by computation of partial absorption for each space elements. The results of simulation of model of micro-structure of bone tissue are presented. They can be useful to show when densitometry test does not contain accurate and full information about bone tissue. It may by helpful in the future while searching for reasons of incomplete correlation between mineral density and mechanical strength.
Źródło:
Journal of Medical Informatics & Technologies; 2004, 8; MM95-104
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of Kalman filtration to estimate changes of trunk inclination angle during weightlifting
Autorzy:
Sapota, G.
Sapota, A.
Wróbel, Z.
Powiązania:
https://bibliotekanauki.pl/articles/333604.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
filtracja Kalmana
algorytm filtru
czujnik przyspieszenia
Kalman filtration
filter algorithm
accelerometric sensor
Opis:
The paper presents a concept of a sensor of weightlifter's trunk inclination angle with the use of Kalman filter algorithms to estimate the trunk inclination angle. The paper presents changes of trunk inclination angle obtained using the algorithm presented. The application of an accelerometric and gyroscopic sensor in the measuring system combined with the algorithms presented in the paper enables precise representation of angle changes during the exercise.
Źródło:
Journal of Medical Informatics & Technologies; 2010, 15; 155-162
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of bone tissue microstructure parameters on bone mineral density parameter computed within the computer simulation process
Autorzy:
Binkowski, M.
Dyszkiewicz, A.
Wróbel, Z.
Powiązania:
https://bibliotekanauki.pl/articles/333857.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
badanie densytometryczne
tkanka kostna
gęstość mineralna kości
mikrostruktury kości
densitometry test
bone tissue
bone mineral density
bone microstructure
simulation of attenuation law
Opis:
The given article was created with reference to lack of correlation between results from densitometry test of bone tissue and its mechanical strength. The changes of bone mechanical strength cannot be solely connected with changes of bone mineral density with micro structural construction of bone tissue. The article describes the research using a computer simulation where changes of physical density and parameters of bone microstructure were modelled. The influences of those parameters for changing the bone mineral density have been computed. It has been calculated during simulation process similar to the way it has been provided from densitometry test. The computation process has been carried out on the basis of computer method of simulation of x-ray radiation propagating through the object and had been was created and tested in the previous research. The model of tested object was defined by spatial high resolution distribution of density. The simulation was executed on a sample of bone tissue. The input data to the model of sample were series of cross-sections obtained previously from micro CT of an animal sample. The changes of parameters were simulated in the model based on a method of 2D image processing. The procedure was used to reduce the trabecular surface for all cross-sections. The results of the algorithm were measured during algorithm process. Images were also analyzed by software to measure parameters of microstructure. It gave a chance to estimate the correlation between measured parameter and parameters of microstructure. The applied method of simulation of attenuation of x-ray radiation allowed to produce densitometry image and to compute parameter similar to bone mineral density. The analysis of obtained results shows how the bone mineral density computed from simulation depends on changes of parameters of microstructure.
Źródło:
Journal of Medical Informatics & Technologies; 2005, 9; 49-55
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A system for remote diagnosis of human gait dynamic parameters
Autorzy:
Sapota, G.
Wróbel, Z.
Kołodziejczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/333987.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
zamierzchłe rozpoznanie
GPRS
remote diagnosis
accelerometers a human gait analysis
Opis:
In this paper an architecture of a system for remote diagnosis of human gait dynamic parameters is presented. The system consists of some sensor groups located on lower limbs. The main system task is collecting and transmitting information describing human gait parameters such as: coefficients of energy, momentary and average power of muscles groups, movement pathologies.
Źródło:
Journal of Medical Informatics & Technologies; 2003, 6; IT107-110
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The parameters of density and mechanical strength of bone tissue in diagnosis of osteoporosis
Autorzy:
Binkowski, M.
Wróbel, Z.
Dyszkiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/333991.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
właściwości mechaniczne tkanki kostnej
rozpoznanie osteoporozy
mikrotwardość
mechanical properties of bone tissue
diagnosis of osteoporosis
microhardness
Opis:
The paper presents results of a study, in which an incomplete correlation between the mineral bone tissue density and patient susceptibility to bone fractures was confirmed. A simple model describing distribution of internal forces present in the microstructure of trabecular bone is proposed. The purpose of this model is to demonstrate that parameters of mechanical strength depend not only on the quantity of mineral material in the bone, but also on the quality of the trabecular structure. In addition, we present the results of cortical and trabecular bone micro hardness test, which are then used to calculate of the modulus of elasticity. Micro-hardness test was performed using Micro-Combi-Tester equipment. Micro-hardness was measured with Vickers diamond; analysis of displacement prosperities was carried out by Olivier and Pharr method. Young's modulus was calculated directly from the resulting unloading curve. Generally, the results for both cortical and trabecular bone tests correspond to the results known from literature. However, depending on localization of the test, slight deviations in modulus of elasticity occur. In conclusion of this research, it is proposed that the dependence between bone mineral density and Young's modulus can be calculated using samples of a normal bone and a bone with changed biomechanical properties. The aim of this research would be to estimate a quantitative coefficient, which would describe differences between mineral bone density and the bone's real density, which is responsible for the immunity to fractures.
Źródło:
Journal of Medical Informatics & Technologies; 2003, 6; IT117-125
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of entity-attribute-value model applications in freely available database management systems for dna microarray data processing
Autorzy:
Waller, T.
Zapart, D.
Tkacz, M.
Wróbel, Z.
Powiązania:
https://bibliotekanauki.pl/articles/332994.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
system zarządzania relacyjną bazą danych
mikromacierz DNA
entity-attribute-value model
relational database management system
DNA microarray
Opis:
Large volumes of data are generated during DNA microarrays experiments. Database management systems (DBMS) are increasingly applied to these data, providing optimum processing and management from multiple microarray experiments. In this study, freely accessible DBMS software versions were compared (Microsoft SQL Server 2008 Express Edition, Oracle Database 10g Express Edition, DB2 Express-C 9.7.2, MySQL 5.1, and PostgreSQL 9.0). We examined them in the context of possible Entity-Attribute-Value (EAV) application as an optimal organization method for microarray data. It was confirmed in the comparative analysis of component data processing methods, consistent with the EAV model, that efficient methods for microarray data analysis are available in Microsoft SQL Server 2008 Express Edition and PostgreSQL 9.0 systems. Also, DNA microarray data processing was confirmed to be more efficient with Microsoft SQL Server 2008 Express Edition as compared with PostgreSQL 9.0. The EAV method was also shown to be suitable for use with open-source versions of DBMS software as an optimum storage model for DNA microarray data. In terms of data processing methods and performance, the Microsoft SQL Server 2008 Express Edition proved to be the best among compared database systems.
Źródło:
Journal of Medical Informatics & Technologies; 2012, 20; 59-63
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer assessment of correctness of mandiblar bones fracture slit integration based on pantomographic radiograms
Autorzy:
Lamża, A.
Wróbel, Z.
Jędrusik-Pawłowska, M.
Drugacz, J.
Powiązania:
https://bibliotekanauki.pl/articles/333660.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
zdjęcia pantomograficzne
minipłytki
osteosynteza
względny współczynnik przemieszczenia odłamów
pantomographic radiograms
miniplate
osteosynthesis
relative faction dislocation coefficient
Opis:
The method of objective assessment of the correctness mandible bones fracture slit was proposed in the research. At present, treatment results are evaluated by comparing pantomographic pictures made before and after integration. It is not an objective method; the estimation of the integration correctness coefficient is not possible, either. The use of computer processing enables introducing the relative mandible faction dislocation coefficient. Thanks to this, measurable determination of bone faction reposition correctness on pantomograms made after osteosynthesis is possible.
Źródło:
Journal of Medical Informatics & Technologies; 2002, 4; MT119-124
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of X-ray propagation in bone microstructure
Autorzy:
Binkowski, M.
Król, Z.
Wróbel, Z.
Zeilhofer, H.-F.
Powiązania:
https://bibliotekanauki.pl/articles/333863.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
mikrotomografia
mikrostruktury kości
tłumienie promieniowania rentgenowskiego
wizualizacja
tomografia komputerowa
erozja
microtomography
X-ray propagation
bone microstructure
attenuation of X-ray radiation
visualization
computed tomography
erosion
Opis:
This paper presents some results concerning the analysis of X-ray propagation through biological structures. We introduce a physical model of the phenomenon and a numerical method based on this model for simulation of X-ray radiation propagation. The proposed method enables generation of radiological projections like those in the computed tomography or microtomography. We have focused our attention on the attenuation of X-ray radiation in bone tissue. Our computational model enables simulation of radiation propagation in the virtual specimen. The virtual bone microstructures used in our experiments are derived from the microtomography datasets of real bone specimens. The main advantage of our approach is that we can change the microstructure of the virtual sample in many ways by using the image processing methods. Results presented in this paper contain simulations of X-ray propagation for modified and unmodified trabecular microstructures as well as the visualization of the radiation intensity distribution for the simulated cases. With this new simulation technique, it is possible for example to analyze the propagation of X-ray radiation for different pathologic types of bone microstructure (e.g. virtually generated osteoporosis).
Źródło:
Journal of Medical Informatics & Technologies; 2005, 9; 75-82
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the results of mandibular fractures sugrical titanium miniplates treatment on the basis of computer-aided analysis of pantomographical radiograms
Autorzy:
Jędrusik-Pawłowska, M.
Drugacz, J.
Lamża, A.
Wróbel, Z.
Powiązania:
https://bibliotekanauki.pl/articles/333670.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
zdjęcia pantomograficzne
osteosynteza
pomiary wspomagane komputerowo
zwichnięcia kości
pantomographical radiograms
osteosynthesis
computer-aided measurement
bones dislocation
Opis:
At present, in mandibular fractures surgical treatment reposition and titanium miniplates osteosynthesis is the most common method used. The treatment results are assessed on the basis of comparative analysis of two radiograms taken before and after fixations of fractures. In this article the objective method of radiological assessment of osteosynthesis is presented. The crucial part of the method is the computer program which was created at The Institute of Computer Biomedical Systems, Silesian University in Katowice. Comparison of placement of bone fragments on a pair of pantomograms taken before and after a particular surgical operation was done. To make the process of the results evaluation an objective one a new parameter - the relative dislocation coefficient - was implemented. Achieved results enable to assess correctness of bone fracture reposition on the pantomographical pictures taken twice, once before and the next time after osteosynthesis.
Źródło:
Journal of Medical Informatics & Technologies; 2002, 4; MT83-89
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using of statistical shape models for pelvis reconstruction in the oncologic surgery
Autorzy:
Skadłubowicz, P.
Król, Z.
Wróbel, Z.
Hefti, F.
Krieg, A.
Powiązania:
https://bibliotekanauki.pl/articles/333118.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
planowanie chirurgii wspomagane komputerowo
segmentacja
rekonstrukcja miednicy
statystyczne modele kształtu
nowotwory miednicy
osteotomia miednicy
computer-aided surgery planning
segmentation
pelvic reconstruction
statistical shape model
pelvic tumours
pelvic osteotomy
Opis:
The reconstruction of the osseous structures in the pelvic region after bone tumour resection is highly complex and challenging. Up to now the reconstruction of the pelvis defects by autologous or allogenous grafts (for instance the fibula transplants) are highly unsatisfied because of large shape differences. Therefore there is a huge demand for patient-specific and anatomically shaped implants. Our pelvis reconstruction planning approach is based on the statistical shape model. For generation of the statistical pelvis shape model a large data pool of CT datasets has been collected. The following CT data segmentation and surface processing methods delivered the required pelvis geometries. Via Procrustes analysis of the collected pelvis surfaces the parameterized pelvis shape mean model has been calculated and the principal component analysis (PCA) [3] applied for estimating the anatomically optimal graft or implant geometry. We will demonstrate on the clinical pelvis reconstruction case that the using of statistical shape models in the oncologic surgery planning is robust and very promising method.
Źródło:
Journal of Medical Informatics & Technologies; 2009, 13; 151-156
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
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