Computed Tomography Artifact Created by Air in the X-ray Tube Oil.

@article{Hedrick2016ComputedTA,
  title={Computed Tomography Artifact Created by Air in the X-ray Tube Oil.},
  author={Wayne R. Hedrick and Michael A Markovic and James Short and Elizabeth D{\'i}az Vera},
  journal={Journal of computer assisted tomography},
  year={2016},
  volume={40 1},
  pages={
          67-70
        }
}
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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