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RADIATION PATIENT LOAD IN DIGITAL AND CONVENTIONAL RADIOGRAPHY
KRAINA, Aleš
To implement a digital service essentially means transition from the established SFR technique (i.e. screen-film radiography) to predominantly CR (Computed Radiography) or DR (Direct Radiography). The stated methods of digitalization differ in their use of a range of types of diagnostic equipment and image digitalization devices. The utilization of individual methods can, however, lead to different results in the amount of skin entry radiation dose and organs absorbed dose in patients undergoing ionizing radiation examination. The objective of this thesis is to compare individual methods (i.e. SFR, CR, DR) generally used for image digitalization in respect of radiation stress for patients. Radiation stress was compared both by measuring entry radiation dose on phantoms and by clinical results acquired from a KAP meter. To validate clinical results, the three most often examinations have been chosen: skull, chest, and stomach examinations. This selection was affected by its frequency and amount of radiation stress. The measured results were then compared with available foreign literature. On the basis of the measurements acquired, it is apparent that Direct Radiography leads to radical reduction in radiation dose in patients. As regards Computed Radiography, it cannot be generally said whether it entails a lower dose in patients. The measured and consequently published figures imply that there are significant differences amongst individual manufactures of CR systems (for example Fuji, Kodak, Konica, etc.) which do or do not lead, in comparison with SFR, to a lower radiation stress. According to the measurements published in this thesis, it can be stated that the use of state-of-the art CR technology could lead to reduction as high as 50 percent of the radiation stress if compared to SFR.
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