CT brain artefact due to air bubbles in the oil cooling system: characteristic band-like configuration on sagittal reformatted image
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Published on: May 31, 2024
Simon Sin Man Wong1, James Siu Wai Cheung2, Tom Wai Kin Lee2
1Department of Imaging and Interventional Radiology, Prince of Wales Hospital, Hong Kong Special Administrative Region, People's Republic of China. simonwong@cuhk.edu.hk.
Purpose:
To retrospectively review the imaging characteristics of CT artefacts due to air bubbles within the oil cooling system of the X-ray tube housing.
Materials And Methods:
Air bubbles were introduced into the oil cooling system of the X-ray tube housing during tube replacement in one of the CT scanners in the authors' institution. All 126 CT brain studies performed in this period were retrospectively reviewed. One hundred and four studies were negative for artefacts. Artefacts were confirmed in 5 and considered probable in 17 studies, respectively. The imaging characteristics of artefacts in these 22 cases were analysed.
Results:
All artefacts manifested as ill-defined hypoattenuations in the periventricular/subcortical white matter of bilateral cerebral hemispheres with/without involvement of the internal capsule and basal ganglia. The posterior fossa was also involved in two (40%) confirmed and four (24%) probable studies. A band-like configuration of hypoattenuations on sagittal images was observed in five (100%) confirmed and eight (47%) probable studies.
Conclusion:
Air bubble artefacts manifested as hypoattenuations in the periventricular/subcortical white matter of the supratentorial brain. A characteristic band-like configuration was observed in the sagittal reformatted image, which is useful for differentiating it from periventricular small vessel disease.
