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Received dose analysis of the Hospital Třebíč, p.o. staff during the radiodiagnostic examinations
ŠOTKOVSKÝ, Aleš
The discovery of X-rays, made by Wilhelm Conrad Röntgen in 1895, was a major turning point not only in medical diagnostics but also in medical science as a whole. The discovery gave rise to a new field of medicine - radiodiagnostics. The field of radiodiagnostics has seen a rapid development, mainly since 1970s. Today, radiodiagnostic imaging methods have an indispensable place in medicine and no medical facility can possibly work without them. With the current fast development in the field of radiodiagnostics, both the extent of X-ray examinations available to patients and the number of patients examined by X-rays have multiplied. Unfortunately, this brings along a higher risk of exposing medical staff to ionizing radiation effects and associated undesirable consequences. To keep the risk at the minimum level and at the same time maintain the number and quality of examinations performed, it is necessary to strictly obey the principles of radiation protection at facilities with sources of ionizing radiation. I addition, regular inspections must be done to check if these principles are obeyed in reality. That is why the doses of ionizing radiation received by staff working at such facilities are monitored and regularly assessed. The objective of this thesis is to analyse the doses received by staff working with sources of ionizing radiation at Třebíč Hospital during the past ten years, when the hospital saw a significant increase in patients examined by radiodiagnostic imaging methods. The thesis is divided into two parts - a theoretical section and a practical section. The theoretical section is based on both domestic and foreign literature. It describes the X-ray radiation itself, its origin, properties, effects and possible use. The theoretical section also explores ways to detect the radiation and the effects it has on living cells. There is a special focus on the protection from ionizing radiation, including the relevant legislation related to this subject and the individual principles of protection. The final chapter deals with dosimetry and thus relates to the research conducted in the practical section. The practical section is based on research. The objective of the research was to analyse the values of effective doses and equivalent doses measured in staff working at the Department of Radiodiagnostics and the central operation theatres in Třebíč Hospital from 2011 to 2021. The research sample included 51 staff members working at those departments for the whole ten-year-long period. The participants were divided into categories according to their departments and their job titles. During the period all staff members were monitored by personal film dosimeters produced by VF, a.s. company. The research was based on the data measured during the period in question.
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Blended learning for teaching radiology subjects
PELIKÁN, Jiří
The objective of my bachelor's thesis on Blended learning for teaching Radiology subjects, was to create a clear list of basic skiagraphic projections in radiodiagnostics, written instructions added to them, photographic documentation for easier understanding of the projection and teaching program in the Moodle ZSF JU environment. In the theoretical part of the work I dealt with the origin of X-rays, its properties and possibilities of use. I also mentioned the risks of its use, the need for proper radiation protection, and I analyzed the parts of the X-ray machine and the systems used in skiagraphy. In the practical part I created a list of standardly used skiagraphic projections. Using professional scripts, instructions, standards and experience of radiological staff of the Kyjov Hospital, I subsequently created a text manual for them, supplemented by photographic documentation of individual projections on a model. Subsequently, I created a tutorial in the Moodle ZSF JU environment, supplemented by a database of exam questions.
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Specifics of the radiodiagnostic examinations in the Hospital of Pelhřimov, p.o.
CHADIMOVÁ, Tereza
Nowadays, sciascopy examinations are increasingly being replaced by other examination methods, which include especially CT examinations, and therefore their number is gradually decreasing. The first goal of the bachelor thesis entitled "Specifics of radio diagnostic examinations in Pelhřimov Hospital, allowance organization", is to describe the history of the radio diagnostic department in Pelhřimov Hospital, allowance organization. The second goal is to analyze trends in imaging methods with a focus on Pelhřimov Hospital, allowance organization, between the years 2009-2018. In the theoretical part I mentioned the history of the radio diagnostic department in Pelhřimov Hospital, allowance organization, and I described contrast agents, their use and distribution. The largest part was devoted to the description of radio diagnostic devices used in Pelhřimov Hospital, allowance organization. These include ultrasound, X-ray machine, computed tomography or skiascopic-skiagraphic wall. Another part of my bachelor thesis contains a description of examinations performed on CT apparatus and skiascopic-skiagraphic wall in Pelhřimov Hospital, allowance organization. For the processing of the practical part I used data obtained from Pelhřimov Hospital, allowance organization, in the form of printed operation logs, with which I created tables. I divided the tables according to the types of examinations and the individual years and compared whether the spectrum of the individual types of examinations on the CT apparatus and the skiascopic-sciagraphic wall have changed in the past ten years. The contribution of this bachelor thesis serves as a background material for the staff of the radio diagnostic department in Pelhřimov Hospital. Furthermore, it is intended to inform the public and other health facilities.
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Sample preparation and their measurement by EDS methods
Kostelník, Tomáš ; Jaššo, Kamil (referee) ; Čudek, Pavel (advisor)
This bachelor´s thesis is focused on preparation and analysis of samples by energy dispersive spectroscopy using scanning electron microscopy. In the theoretical the main differences between environmental scanning electron microscopy and scanning electron microscopy are described. There is also a description of basic knowledge regarding energy dispersive spectroscopy. The generation and detection of signals arising from the interaction of a beam of primary electrons with a sample is also explained, with emphasis on the description, generation and distribution of these signals. The experimental part is focused on sample preparation and analysis.
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Determination of the chemical composition of a brass sample by X-ray fluorescence method
Tomanová, Michaela ; Čudek, Pavel (referee) ; Vaněk, Jiří (advisor)
The fluorescence spectroscopy method is used to distinguish components in gas, liquid, or solid samples. The study is based on the parameters of secondary radiation, which is emitted by each element and allows them to be identified. The distinction between each radiation is analogous to a fingerprint. Apart from quantitative and qualitative analyses, the method can be used to determine the thickness of metal layers and alloys. Laboratory analysis has a broader range of application than portable devices, which are also available. In the laboratory, two methods of measurement are available: wavelength dispersive fluorescence spectroscopy – WDXRF and energo dispersive fluorescence spectroscopy – EDXRF. A brass sample with lead additive was analyzed using EDXRF in the practical part of this diploma thesis. An X-ray apparatus from the Leybold company was employed for the analysis, which will be used for education of lower grades at the university. A measurement station and a laboratory assignment were developed as part of the thesis, the aim of which will be to determine the chemical composition of a brass sample using the X-ray fluorescence method.
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Construction of motorized filter changer for tomographic system Rigaku Nano3DX
Maleček, Lukáš ; Nožičková,, Dominika (referee) ; Zikmund, Tomáš (advisor)
X-ray computed tomography is a technique that finds widespread application nowadays. The initial use of this technique was mainly in medical diagnostics. The achievable accuracy of this technique has been progressively improved so much that today the computed tomography finds applications even in the field of industry. It is a non-destructive method of three-dimensional imaging of the internal structures of the examined objects. The quality of the resulting CT data is influenced by several factors. One of these factors is the property of X-rays, which we use for measurements. We are able to partially alter the properties of X-rays and thus obtain higher quality CT data, without the occurrence of some tomographic artifacts. The main way how we can change the properties of the generated X-rays is called additional filtration. This work deals with the study of X-ray spectra, based on which X-ray filters are optimized, to achieve the most efficient filtration. The main aim of this bachelor thesis is also the construction and production of a motorized changer of these filters, which should cause the speeding up the process of setting the whole CT measurement and allow the development of new computed tomography techniques.
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Laser-driven hard X-ray source for imaging applications
Lamač, Marcel ; Nejdl, Jaroslav (advisor) ; Kozák, Martin (referee)
With the advent of high-power lasers in recent decades, a unique source of hard X-ray radiation has become availible. This source of collimated, broadband, femtosecond, incoherent and hard X-ray radiation is produced when a focused laser with intensity above 10^18 W/cm^2 collides with a gas target. The strong electric field of the laser pulse ionizes the gas and interacts with the plasma generating a strong plasma wake wave. This space charge separation inside the target generates longitudal electric fields of the order of 100 GV/m. This resulting electrostatic wakefield accelerates the electrons to relativistic velocities and causes them to travel in oscillatory motion behind the laser pulse, producing hard and collimated X-ray radiation. This thesis is focused on a theoretical evaluation and an experimental design of this laser-plasma X-ray source. Furthermore, we consider the source's unique properties for novel imaging applications.
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Spectral computed tomography: comparison of real and virtual nativ images
Širůčková, Kateřina ; Bartušek, Karel (referee) ; Marcoň, Petr (advisor)
Advanced X-ray medical diagnostic methods massively increase the radiation exposure of patients. Therefore, it is necessary to focus on the reduction of radiation and its stochastic and deterministic effects. This project compares real native images TNC with virtual native images VNC. Virtual native images are acquired by spectral computed tomography method and it is suggested that VNC could potentially substitute real native images, thereby, the total radiation dose from multiphase spectral CT would decrease. A comparison was performed by defining certain parameters that represented the differentiation of the measured and calculated values in the images. The parameters were SNR, CNR, absolute difference, relative error and they were analysed by statistical tests using p-value and correlation analysis. Another output is a database of patients with compared parameters from real and virtual native images.
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The spectroscopy study of focused short-wavelength laser-matter interactions
Burian, Tomáš ; Juha, Libor (advisor) ; Čuba, Václav (referee) ; Klír, Daniel (referee)
Title: The spectroscopy study of focused short-wavelength laser-matter interactions Author: Tomas Burian Department: Department of Surface and Plasma Science Supervisor: Ing. Libor Juha, CSc., Department of Radiation and Chemical Physics, Institute of Physics of the Czech Academy of Sciences, Prague Abstract: This thesis is focused on processes occurring during and immediately after an interaction of intense short-wavelength laser pulses with matter. Extreme states of matter (warm dense matter - WDM and hot dense matter - HDM), induced by EUV/SXR/X-ray lasers of two kinds, i.e., free-electron lasers (FEL) and plasma-based lasers, were investigated by emission spectroscopy over various spectral ranges and mass spectroscopic techniques. Absorption/transmission experiments revealed an effect of saturable absorption of soft X-ray laser radiation in aluminium WDM. Then, an ionisation potential depression (IPD) in dense plasmas was investigated by means of X-ray emission spectroscopy. Results obtained with the X-ray FEL-produced plasma exhibit very good agreement with computer simulations considering the Ecker-Kröll model. Analysis of optical emission spectra (OES) supports the key role played by fast recombination processes in the ablation plume created by focused short-wavelength laser beams on the solid target...
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Radiation protection of pediatric radiodiagnostic
VÁLKOVÁ, Alena
In my thesis I deal with ionizing radiation, its origin, its effects and principles. I also deal with radiation protection and its principles, medical exposure and pediatric radiodiagnostics in terms of imaging methods and specifics of radiation protection in paediatrics. And whether all the methods used to reduce radiation exposure in children undergoing ionizing radiation are used. Part of the work is also devoted to the way of communication in this area and awareness, whether it is paid enough attention or this area is neglected in the Czech Republic.
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