Vliv přírodního radiačního pozadí na paměťové fólie pro nepřímou digitalizaci obrazu

Abstract

Ionizing radiation can be divided into two basic groups, namely artificially created and naturally created. The thesis deals with the second form, namely natural radiation, which occurs on Earth quite commonly. However, how natural radiation can affect skiagraphic cassettes for indirect digitization has not yet been fully elucidated. Indirect digitization is still a widely used method in radiology and it is advisable to know how ionizing radiation can affect cassette degradation. Along with the image measurement, data on the dose value at the measured site is also obtained. The dynamic effect of noise during exposure based on radiation background is evaluated using regionally oriented segmentation, classifying the image into regions that reflect the dynamics of noise action during measurement. Thanks to the appropriately chosen thresholding method, a number of statistical analyses are carried out, including descriptive statistics, two-sample and multi-sample tests. A prediction model for cassette degradation is subsequently created.