CT brain artefact due to air bubbles in the oil cooling system: characteristic band-like configuration on sagittal reformatted image.

Autor: Wong SSM; Department of Imaging and Interventional Radiology, Prince of Wales Hospital, Hong Kong Special Administrative Region, People's Republic of China. simonwong@cuhk.edu.hk., Cheung JSW; Department of Imaging and Interventional Radiology, Prince of Wales Hospital, Hong Kong Special Administrative Region, People's Republic of China., Lee TWK; Department of Imaging and Interventional Radiology, Prince of Wales Hospital, Hong Kong Special Administrative Region, People's Republic of China., Tsai CSC; Department of Imaging and Interventional Radiology, Prince of Wales Hospital, Hong Kong Special Administrative Region, People's Republic of China., Ng AWH; Department of Imaging and Interventional Radiology, Prince of Wales Hospital, Hong Kong Special Administrative Region, People's Republic of China.
Jazyk: angličtina
Zdroj: Japanese journal of radiology [Jpn J Radiol] 2018 Feb; Vol. 36 (2), pp. 90-95. Date of Electronic Publication: 2017 Nov 08.
DOI: 10.1007/s11604-017-0702-3
Abstrakt: 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.
Databáze: MEDLINE
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