“…The described method is then applied to classification of the CT scan heart slices quality. In general, there are numerous problems with automatic CT scan heart slices processing, caused by the CT scan examination nature, among others high noise level, low contrast between the examined tissue and its background and high variability in the level of gray due to differences in tissues thickness and absorption level of radiation [8,23]. The considered images can be characterized fast with the histogram that shows whether the brightness ranges of objects are selective [52].…”