Introduction: Computed tomography (CT) is a technology that scans the structure with an x-ray device and detector lying on the opposite side. It rotates around the scanned structure and produces a series of images. The development provides us with different techniques of scanning. Spectral CT imaging is one of them. The technique is based on two different beam energy of the same scanning area. The product of the technique are two different attenuations of the same structure. The program tools enable a fusion of both spectrums. With that, we can better view anatomy and more artifacts reduction. DSCT provides different options for reconstructions. With the technology, we can make: average weighted images, virtual monoenergetic images, material decomposition images, electron density maps and effective atomic number maps. There are many ways of acquisition. We can image with: two different x-ray tubes, double layer detectors, a fast voltage switch, filtering technique and photon counting. Purpose: The purpose of my diploma work is a presentation of spectral CT imaging. This contains the system's functioning, ways of scanning, and how much we use it in the clinical environment. Besides that, the purpose is also a presentation of clinical use in the Clinical center of Ljubljana. Methods: The descriptive method was used. I have searched for the information in Slovene and English. For all measurements, I have used the program called Syngio.via VB60 Siemens Healthineers in the Clinical center of Ljubljana. Results: In the results, I have presented the products of spectral CT imaging. The results are the display of kidney stones, lung perfusion, bone removal, metal artifacts reduction, virtual monoenergetic image, and virtual non-contrast image. Discussion and conclusion: After the research, I have found that the Clinical center of Ljubljana does not use all possible options of spectral CT imaging. They usually use a display of kidney stones, lung perfusion, virtual monoenergetic image, virtual non-contrast images and reduction of metal artifacts. Other functions, like bone removal, segregation of active bleeding and old lesions, are not in daily clinical use.
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