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Computed Tomography Artifact Created by Air in the X-ray Tube Oil
Wayne R Hedrick1, Michael A Markovic, James H Short
1From the Radiology Department, Aultman Hospital, and Northeast Ohio Medical University, Rootstown, OH.
Abstract:
A subtle artifact of patchy hypodensities in computed tomography images of the head mimicked acute or subacute cerebral infarct. The cause of the artifact was air in the oil of the x-ray tube. The artifact manifested only when the acquisition parameters included a rotation time of 0.5 second and a gantry tilt angle of 11 to 20 degrees. Routine quality control testing did not detect nonuniformities in the water phantom.
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