Analysis of the accuracy of mapping in computed tomography

The aim of the study is to assess the accuracy of mapping the internal structure and shape of phantoms in computed tomography (CT) imaging, using reconstructive metrology and virtual measurements. The tests material is tomographic imaging of diagnostic phantoms: the head phantom used for monthly calibrations of computer tomographs and the specialized phantom for tests performed once a year. The Materialize Mimics computer program was used to measure the geometry of objects inside the phantoms and to measure the radiological density in the cross-sections of the tested patterns. It is a universal tool for assessing the accuracy of mapping in CT imaging. The results of the measurements were used to perform a complete statistical analysis. The values of standard deviations for the performed measurements did not exceed the limit value, which means that the tested tomograph meets the requirements for homogeneity of imaging and noise level specified in the Regulation of the Minister of Health. The proposed procedure is important for the target device, but can also be a tool for comparing the quality of different tomographs.