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Non-invasive vascular imaging of cardiopulmonary thoracic vessels
Weichet, Jiří ; Kreuzberg, Boris (advisor) ; Lisý, Jiří (referee) ; Žižka, Jan (referee)
Methods of non-invasive vascular imaging of thoracic vessels are briefly introducted in the first part of the thesis. Benefits and limitations of CT angiography and MR angiography of the thoracic aorta, pulmonary vessels, great thoracic veins and cardiac vessels are discussed. The main part of the thesis is concerning to pulmonary veins imaging in cohort of patients with atrial fibrilation, who underwent radiofrequency ablation of the pulmonary veins. Aim of the study was to confirm the CT angiography as suitable method of pulmonary veins imaging, to find out frequency of atypical pulmonary veins anatomic arrangement and to measure pulmonary veins diameter in our cohort, including comparison between both sexes. The main purpose of the study was to compare the diameter of pumonary veins before and after the radiofrequency ablation and discover frequency and severity of iatrogenic pulmonary vein stenoses after the procedure. The group of patients planned for biventricular stimulation implantation is presented finally. CT angiography of coronary sinus and his branches was performed before the procedure. Aim of this work was to evaluate whether the CT angiography is proper method for cardiac venous system visualisation and wheather is it possible to choose patients suitable for implantation of left ventricle...
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Cardiovascular involvement in patients with Fabry disease
Jirák, Daniel ; Hájek, Milan (advisor) ; Vymazal, Josef (referee) ; Žižka, Jan (referee)
The evaluation of clinical magnetic resonance (MR) images is influenced by errors (subjective evaluation, noise, etc.). It is possible to eliminate these errors by using certain mathematical and statistical methods. One of these methods is texture analysis (TA), which can describe images quantitatively by computed texture parameters. The aim of this thesis was to analyze MR images of various subjects (phantoms, apples, calf muscles, livers) by TA and to evaluate its possible use in clinical practice. The main tasks of the thesis were: 1) to develop a new phantom suitable for TA and MR imaging that is biochemically and mechanically stable 2) to optimize an algorithm for TA parameter selection and classification 3) to apply TA in evaluating MR images. The first methodical part of the thesis deals with the optimization of texture parameter selection and texture classification. For this purpose a new type of phantom was developed. This PSAG phantom, with a nodular structure from polystyrene spheres (PS) placed into agar (AG), is suitable for MR imaging and for TA because it produces a strong MR signal and because its T1 and T2 relaxation times are in the range of biological tissue and can be easily modified by employing various densities of PS spheres or by the addition of a contrast agent. Measurements of PSAG...
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Mapping of the Basic Characteristics of Anthropogenic Soil on Dumps in Sokolov Coal Basin
Žižka, Jan ; Sixta, Jan (advisor) ; Konstantin, Konstantin (referee)
This thesis deals with the processing and comparing information on the thickness of A0 horizon (humus mulch) forming anthropogenic soils in forestry reclamation Sokolov brown coal basin. Comparison of data found in Bažantnice Bohemie reclaimed forestry in 1923 with newer areas of forestry reclamation dumps Velký Riesl, Dvory, Gustav and data from previous studies on the Velká podkrušnohorská výsypka.
This thesis deals with finding major differences, especially power, humus horizons A0, depending on the time of the establishment of forest reclamation and the reclamation age of trees. To unify and minimize variables are all shallow pits removed under alder sticky.
Based on field research was collected from each of five shallow soil probes on each of the dumps. Probes were taken evenly over the surface of the dump and always under identical reclamation trees. Were identified basic characteristics of humus horizon A0 and the individual probes was a proper photographs. Based on removing shallow soil pits were identified basic characteristics of humus horizon A0. The test was conducted in the laboratory granularity to better implement the results of the work in the coming years.
Identified the basic characteristics of humus layers A0 are mutually compared and evaluated basic statistical methods. From the data obtained were created layers in ArcGIS, which were interpreted in this thesis and stored on a data carrier, mainly because of their possible use for further research needs in the coming years.
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The importance and influence of family and social environment on locomotor activity of children
ŽIŽKA, Jan
This thesis deals with the importance of physical activity of children at school age and the effect on the formation of social surroundings. The aim was to find out who most affect children's physical activity and whether people have the physical activity of children correct opinion, or conversely whether fictional ideas that often lead to the cause of decline in physical activity. The literature search describes the theoretical basics. As a research method of this paper questionnaire was used. Survey data were statistically processed and evaluated. Overall, people rated as the most important influence of family on children's physical activity. Misconception had in determining the daily dose of children's movement.
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Insurance responsibility for damage caused in relation with a major accident
Žižka, Jan ; Šauer, Petr (advisor) ; Hadrabová, Alena (referee)
My dissertation deals with the insurance responsibility for damage caused in relation with a major accident. The main goal of this task is to evaluate the state intervention in the form of a compulsory liability insurance for firms, which can cause a major accident. In my work I will support the thrust of the state intervention and will try to find a premise for that. I will show that the target of compulsory liability insurance is not to complicate life of new firms or of existing ones. I want to demonstrate that compulsory insurance leads to a better precaution for a major accident and it can also lead to precaution and safety investments. Further, I want to point out that compulsory insurance does not protect only firms, but also their creditors and employees. The protection company is to avoid a pointless risk in case that the firm itself takes too low an aversion towards risk. If the firm employes the compulsory liability insurance, the insurance company becomes another control body that is responsible for safety. This is consequently a benefit for taxpayers, whose money is not used for some damages caused by insolvent companies. The benefit for creditors and injured employees is also a big security in case of an accident, where an insurance company ensures a company's solvency. There are many other good reasons for compulsory insurance, and we can definitely find bad reasons too. Overall however, I see compulsory insurance as beneficial.
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