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"Radiographic examination of premature infants using a mobile x-ray unit"
DUPAČOVÁ, Markéta
My thesis deals with the issues of X-raying of premature infants by means of a mobile X-ray device. I have concentrated on chest skiagraphy of prematurely born children, on mobile diagnostic technology, on X-raying techniques, on the correct imaging procedure, X-ray image quality, but also on radiation protection and radiation load the infant organism is exposed to during skiagraphy. My aim is to apply the experience in X-raying of premature infants by means of a mobile skiagraph and to compare the X-ray image quality and radiation load obtained in two different devices and techniques. I performed the comparison of radiation load and X-ray image quality on a sample of prematurely born children examined at the Radio-diagnostic Department of Písek Hospital in 2007 through 2010. The experience in application of the mobile diagnostic technology in a special group of patients obtained from this research may also be applied at further workplaces involved in the same field.
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Radiation load of patients in the x-ray examination of the lungs
POKORNÁ, Adéla
The goal of this paper was to compare the radiation load of patients on the RTG examination of lungs by different screening methods used at the Radio-diagnostic Clinic of the Faculty Hospital Královské Vinohrady in Prague. The measurement was made using thermo-luminescence dosimeters (TLD) located in the anthromorphous phantom. From the values measured, the effective doses were calculated and the values obtained were compared both to each other, and to the data available in the literature. The results confirmed that the use of the soft method leads to a significant increase of both the surface dose (the dose on the skin), and the effective dose.
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Confrontation of radiation dose of professional in nuclear medicine department in Hradec Králové before and after installation PET/CT, possibilities of monitoring
JANSOVÁ, Martina
This Bachelor Thesis deals with the radiation load of Nuclear Medicine employees of University Hospital Hradec Králové before and after the introduction of PET/CT examinations. Compared with usual examinations with gamma emitters and therapy with open beta emitters, the PET/CT examination method uses positron emitters and is carried out at the Department of Nuclear Medicine of University Hospital Hradec Králové (DNM UHHK). The use of positron emitters leads to increased demand in respect of radiation protection and work organisation. I made an evaluation of doses from personal dosimetry from 2004 until 2008 prior to the introduction of the PET/CT examination methodology; and year 2009 is subsequently assessed in respect of the situation after the introduction of PET/CT examinations. The results of doses are provided in tables. Film dosimeters and thermoluminescence (TL) ring dosimeters had been used for personal dosimetry until 2008. Digital dosimeters have been also used for personal dosimetry since 2009, and they are further included in the comparison of the received radiation doses of employees. The results were used for an evaluation of optimisation of radiation protection at the DNM UHHK.
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Monitoring the personnel radiation load in percutaneous interventions
SKÁCELOVÁ, Lada
The discovery of ionising radiation at the turn of the nineteenth and twentieth centuries was a landmark for medicine: the methods based on the principle and effects of ionising radiation are used even in the present medicine to a considerable extent. As early as in the very beginnings, adverse affects of ionising radiation were observed, and from this early period the first references to the need of radiation protection date. The fields of medicine dealing with the application of ionising radiation, whether in the diagnosis or in the therapy of diseases, went through an extensive development in their over hundred-year history. It was in the technical sphere in particular where the most important progress was accomplished, thanks to the ever more advanced instrumentation put on the market, meeting the strict criteria of radiation protection. On the one hand, a large group of diagnostic and therapeutic procedures was replaced by new methods (based on ultrasound and magnetic resonance) that are not based on ionising radiation, and thus the patient or the attending personnel are not exposed to the harmful effects of the radiation. On the other hand, the interventional radiology has attained an unprecedented expansion. With the development of new interventional methods and procedures, the number and duration of interventions has been growing. The radiation load to which the intervening personnel are exposed has thus been rising despite the state-of-the-art instrumentation. The theoretical part of the dissertation describes the origin and types of the ionising radiation, its properties and interactions with the environment; a proportional part has been devoted to the biological effects of the radiation. The prime attention has been concentrated on radiation protection, its objectives, principles and methods of radiation protection. An overview of the current legislation and list of requirements on the radiation monitoring has been elaborated. In the chapter on personal dosimetry, the fundamental relations and quantities used in the radiation dosimetry have been described, as well as the types of personal dosimeters and protective equipment. In the practical part, the radiation load of the personnel attending percutaneous interventions in the department of interventional radiology of the Clinic of Radiology of the Teaching Hospital Olomouc was measured. Personal electronic radiation dosimeters Rados, type RAD 60S, were used. All the data obtained were processed using statistical methods, and, on the basis of the results thus obtained, the effectiveness of protection was determined, and the importance of the observation of the principles of radiation hygiene was evaluated. The presumed use of the results of this work in practice is in the optimisation of procedures and measures leading to the maximum possible reduction of the radiation load in percutaneous interventions, and to the education and guidance of personnel towards consequential compliance with all principles of the radiation hygiene.
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Patient radiation load and possibility of reduction by percutaneous coronary interventions
KVASNICOVÁ, Miroslava
Abstract More than 100 years have passed since physicist W.C.Röntgen discovered X rays and their use in medicine. Knowledge about their harmful effects led to gradual im-plementing of protection rules. Attention of experts gradually focused on persons exa-mined or treated by ionizing radiation, as so-called medical exposition represents the most important part of person´s irradiation from artificial sources of radiation at all. De-finition of medical irradiation was accepted by Act No.18/1997 Coll. (Atomic Act) and extended in novel of the Act (No.13/2002 Coll.). Medical irradiation is not limited but two principles of radiation protection govern {--} principle of reasoning and principle of optimalization. I focused my attention on radiation load of patients during selective coronaro-graphy which still remains gold diagnostic standard for coronary arteries examination. I measured and evaluated the radiation dose of patients at two angiography machines in Teaching Hospital in Motol. They are angiography machines PHILIPS Integris Allura (made in 2002) at Institution of Imaging Methods and PHILIPS Integris HM 3000 (ma-de in 1993) at Cardiovascular Centre for Adults. Some technical parameters of these machines differ, e.g. the size of image amplifier. Since 2003 to 2007 10,087 patients at Cardiovascular Centre for Adults and 7,760 patients at Institution of Imaging Methods were examined by selective coronarography. I analyse all equipment of angiography work place, including technical of X-ray angiomachine, radiological standards, protection against radiation, requirements for imaging system, parameters impacting the quality of X-ray image, possibilities of lowering radiation load in patients. Hypothesis is based on idea that radiation load can be lowered by setting suita-ble exposition parameters and collimators. Methodology consists of measurements of exposition dose in 100 patients at Institution of Imaging Methods and at Cardivascular Centre. I compare the dose at both work places on the base of different size of image amplifier, different frequency of scanning and advert to different dose in different projection. Other part consists of mea-surements on phantoms, in which I compare the dose acquired in patients. I watch fur-ther parameters impacting the level of radiation load. Acquired results are mutually compared and statistically elaborated and valuated by {$\omega$}2-test. Evaluated data can serve for creating of radiologic standards which will contribute to staff education how to ma-nipulate sources of X-ray radiation to make the dose for a patient and for staff as low as possible.
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Algorithm of imaging methods in suspicion on pulmonary tuberculosis
MIKULÁŠOVÁ, Jana
Tuberculosis is an infectious disease which more than 8 million people are taken ill with throughout the world every year. During the last decade more than 30 million people succumbed to it. The Czech Republic succeeds in decreasing the number of TB cases, despite of it the physicians warn how dangerous is still this infectious disease. Basic diagnostic examination in pulmonary TB is an X-ray examination. Radiophotography, so called {\clqq}štítovka`` enacted remarkable part in combating TB. This apparatus was used in past for collective X-ray examination. The disadvantage of this technique is substantionally higher radiation load. In my work I dealt mostly with contemporary possibilities of radiodiagnostics in pulmonary TB examination (with regard to radiophotography). I carried out measurement of entering surface kerma with the help of water phantom in different work places, with different types of machines. In my thesis I compared examination techniques, both from the point of diagnostic yield , and from the point of patients´ radiation load. X-ray diagnostics participates in big rate in medical irradiation, which is the most important part in human irradiation from artificial radiation sources. Implementation of new diagnostic methods (especially computer tomography) resulted in important expansion of diagnostic possibilities . On the other hand, historical equipment still functions, e.g. cabin machines for imaging from the photographic plate. The most important factors affecting radiation load of patients is modern machine equipment, regular running of tests of long-term stableness and working steadiness , as well as protective aids use. In every work place with sources of ionizing radiation a permanent supervision on respecting of radiation protection rules must be ensured.
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Monitoring patient´s radiation load during mamograph screening
HÁJKOVÁ, Michala
The development of mammography equipment made it possible to reduce the amount of radiation necessary for mammography exams. On the other hand the demands on image resolution have been growing, which means that the average amount of radiation has actually increased. It is necessary to decrease the irradiation amount during screening as much as possible without jeopardising image quality. When using a modern mammography system, the medium dose of irradiation absorbed by the gland is approximately 1 {--} 1.5 mGy for each picture. Patients can undergo as many as 25 mammography exams in their lifetime and therefore it is necessary to reduce the irradiation to an acceptable minimum. In 1631 patients underoing mammography screening, the following relations for the cranio-caudal projection of the left Braest were evaluated: the dependence of a mean mammary gland dose on the compressed Brest thickness and on mAs. The largest group in the monitored set was between 50 {--} 54 years of age and the age of the mammography screening clients examined for the first time was between 45 {--} 49 years. In my work I recommended a program for the calculation of glandular irradiation, which is available on the Internet for free and I did not detect elevated ``diagnostic reference levels.{\crqq}
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