Abstract:
Artifacts can seriously degrade the quality of computed tomographic (CT) images,
sometimes to the point of making them diagnostically unusable. To optimize image
quality, it is necessary to understand why artifacts occur and how they can be
prevented or suppressed. In this study we evaluate the image quality in three hospital
al-zytoun specialist hospital, Al-Ribat teaching hospital and the Modern Medical
Center and we found, CT artifacts originate from a range of sources. Physics-based
artifacts result from the physical processes involved in the acquisition of CT data.
Patient-based artifacts are caused by such factors as patient movement or the
presence of metallic materials in or on the patient. Scanner-based artifacts result
from imperfections in scanner function. Design features incorporated into modern
CT scanners minimize some types of artifacts, and some can be partially corrected
by the scanner software. However, in many instances, careful patient positioning and
optimum selection of scanning parameters are the most important factors in avoiding
CT artifacts.
