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Safety of magnetic resonance imaging for the examinated patient
Staněk, Jakub ; Kašpar, Miroslav (advisor) ; Daníčková, Kateřina (referee)
Magnetic resonance imaging is a modern radiological imaging method. It allows to diagnose pathological changes in the human body without any need to disrupt of its structure. The main advantage of NMR is that it does not use any harmful ionizing radiation. Because NMR is a relatively young technology, any harmful effects have not found yet on the human organism. But from the physical point of view the potential risks arise consequence of biological structures interaction and tissues with the static magnetic field, gradient magnetic field and high frequency electromagnetic field. Due to the development methods it leads to intensification of these fields inside the device. Master's thesis involved research of biophysical effects and potential risks of static magnetic field, gradient magnetic field and high frequency electromagnetic field used in magnetic resonance. Result interactions of these fields with investigated patients' bodies biological structures leads to heat induction inside their bodies. Temperature of the investigated parts of patient body is monitored. Ascertained data are evaluated by the Wilcoxon non-parametric test with simulation Monte Carlo.
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Safety of magnetic resonance imaging for the examinated patient
Staněk, Jakub ; Kašpar, Miroslav (advisor) ; Daníčková, Kateřina (referee)
Magnetic resonance imaging is a modern radiological imaging method. It allows to diagnose pathological changes in the human body without any need to disrupt of its structure. The main advantage of NMR is that it does not use any harmful ionizing radiation. Because NMR is a relatively young technology, any harmful effects have not found yet on the human organism. But from the physical point of view the potential risks arise consequence of biological structures interaction and tissues with the static magnetic field, gradient magnetic field and high frequency electromagnetic field. Due to the development methods it leads to intensification of these fields inside the device. Master's thesis involved research of biophysical effects and potential risks of static magnetic field, gradient magnetic field and high frequency electromagnetic field used in magnetic resonance. Result interactions of these fields with investigated patients' bodies biological structures leads to heat induction inside their bodies. Temperature of the investigated parts of patient body is monitored. Ascertained data are evaluated by the Wilcoxon non-parametric test with simulation Monte Carlo.
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The history and development of skiagraphy
Dvořáková, Kristýna ; Hořák, Jaromír (referee) ; Daníčková, Kateřina (advisor)
This bachelor thesis "The Evolution of Radiography" deals with sequential development of this imaging method. It covers time period from discovery of X-rays by Wilhelm Conrad Röntgen in 1895, over the conventional Radiography to the current methods and trends of the digital Radiography. For this important discovery, Wilhelm Conrad Röntgen, german physicist, got the Nobel Prize in 1901. This work provides complex information about X-ray technology and describes the image creation procedure. The "Analog Radiography" chapter describes Radiography equipment and the projection type transition: from the conventional film screen radiography to the computed and direct radiography. In case of the Computed radiography (CR) the cassette containing the X-ray film is replaced by a cassette with the photostimulable phosphor. The manipulation with the cassette is almost the same. But we don't need the dark room to get the final image, it is replaced by the reading device - the scanner. The simplest and optimal imaging system for future is the direct radiography (DR). The direct radiography uses two types of semi-conductor detectors described in detail in this work: with direct and indirect conversion of X- rays to electrical impulses. These semi-conductors are placed under the Bucky grid on examination table or on the...
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