Concentric circles appear on CT images. Do you have any countermeasures?

X-Ray Inspection System FAQ

Concentric circles of bright or dark patterns that can be recognized on CT images are called ring artifacts. It originates from the detector's uneven sensitivity and the X-rays' variable brightness.
You can reduce by calibrating the detector and using the ring artifact suppression features.

Microfocus X-ray Inspection Systems

X-Ray Inspection System