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[Investigation of Metal Artifacts Occurring in Axial Planes without Intracranial Metal Coils: A Phantom Study Using
Kazuhiro Tsunekawa1,2, Naoki Nagasawa3,4, Jyunya Tone2
1Division of Health Science, Graduate School of Health Science, Suzuka University of Medical Science.
Purpose:
The objective of this study was to evaluate metal artifacts on axial planes without visible metal by simulating postoperative computed tomography (CT) examinations following coil embolization of dural arteriovenous fistulas. Specifically, we assessed the behavior of metal artifacts in the pericoil region and aimed to propose an imaging protocol that minimizes metal artifact occurrence.
Methods:
An intracranial metallic coil phantom was constructed and scanned using two different area detector CT systems. The behavior of metal artifacts around the coil was evaluated according to the axial position of the metal coil, collimation width, reconstruction algorithm, scan mode, and the presence or absence of metal artifact reduction (MAR).
Results:
We confirmed that CT value elevation occurred on axial planes without visible metal due to artifacts originating from the metallic coil. This phenomenon was observed regardless of coil position, scan mode, or the use of MAR. It also occurred with all reconstruction algorithms except model-based iterative reconstruction. Furthermore, narrowing the collimation width reduced the magnitude of CT value elevation.
Conclusion:
Because artifacts occurring on axial planes without visible metal may be reduced by using a narrower collimation width, scanning with narrow collimation is recommended for postoperative CT examinations following cerebral aneurysm embolization.
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