KT tyrime dažniausiai pasitaikantys artefaktai

Lysenko, Egidijus

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KT tyrime dažniausiai pasitaikantys artefaktai

Lysenko, Egidijus

URI: http://dspace.kaunokolegija.lt//handle/123456789/200

Data: 2018-05

Santrauka:

KT tyrimuose pasitaikantys artefaktai, priežastys bei jų dažnumas

Description:

The aim of the study: To assess most common artifacts in CT procedures. Study objectives: 1. To disclose CT most common artifacts and their origin causes. 2. To assess Kaunas medical university clinics amergency department„s artifacts appearance frequency. 3. To determine the causes due to which artifacts appear in Kaunas medical university clinics amergency department. The method of the study: During this study all the data of 2018. March was collected in Kaunas medical university clinics amergency department regarding CT procedures and image evaluation. This study was carried out using a qualitative descriptive study and all of the data were collected using a specially designed studies instrument. All of the studies population was carefully sorted out in to different CT procedure groups which allows to determine the artifacts type frequency and its cause. The results of the study: The investigation analysis of the data revealed two main conclusions. Firstly, the status of Lithuania„s CT equipement issn„t great, because the majority of detected artifact types is physics based artifacts who„s cause is - equipement. Secondly, artifacts frequency is not straightly proportional to the number of completed CT procedures and it depends strictly on the anatomical procedures type. Conclūsions: 1. Using Lithuanian and foreign litherature it was possible to detect all of the artifact types by presenting their real pictures. This shows that Lithuania„s CT procedures situation suffers from the same causes and results in the same CT image quality images, thus artifacts still remain a big concern today. All of the same errors are detectable, thats why we can conclude that, CT machines require more attention. The fact that it was possible to detect all of the artifact types shows that the problems exist in all of CT areas; equipement, practical pacients preparation and in standart procedures protocols. 2. In the presented artifacts frequency chart it„s visible that artifacts frequency is not straightly proportional to the number of completed CT procedures. This is clearly visible in the heads CT chart artifact frequency. All of this allows to make a conclusion that the artifacts frequency really depends on the scanned section, topographical projection and pacients heterogenical properties. An unusually high artifacts frequency is detected in areas in which exists very high bone density and fast change of the body tissue. The used litherature concludes that, different artifacts result in different areas. 3. Using the collected data we can conclude that the biggest cause for the existing artifacts are physics based reasons. Almost in all of the mentioned procedures one type of artifact frequency stands out – physics based artifacts. This lets us to believe that Kaunas medical university clinics amergency department„s CT machines health is not in the best condition and could be improved. Reasons such as, detector wearing and faulty x-ray tubes cause physics based artifacts, which could be avoided by performing prophylactic evaluations more frequently.

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