However, some rare artifacts are more difficult to recognize and may lead to erroneous interpretation, additional imaging, or sometimes treatment. partial volume artifact occurs resulting from tissues of different absorption being encompassed in the same CT voxel producing a beam attenuation proportional to the average value of these tissues or certain motion artifacts causing blurs, streaks or shading, similar as in plain radiographs (Table 1). Other artifacts are so well known that they are routinely included in differential diagnosis on interpreting CT e.g. This is often encountered specially in cerebral CT. streak artifact due to differences in attenuation between high and lower density materials, or ring artifact, resulting from defect detector element). Most artifacts are detected as they are easily recognizable, e.g. They can arise from a variety of factors: patient related, physics related, due to hardware or Helical and multichannel artifacts. And especially in smaller children, there is hardly ever a necessity for sedation as opposed to MRI.Īs CT makes use of complex computer-processed combinations of X-ray images taken from different angles to produce cross-sectional (tomographic) images (virtual slices), it is vulnerable for artifacts. Although MRI can provide more detailed information, CT remains valuable due to its easy accessibility and prompt results. CT scan (or X-ray computed tomography (X-ray CT) or computerized axial tomography scan (CAT scan)), has revolutionized neurologic imaging and diagnostic possibilities since its introduction.
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