Halo artifacts of indwelling urinary catheter by inaccurate scatter correction in F-FDG PET/CT imaging: incidence, mechanism, and solutions.

Background: Halo artifacts from urinary catheters can occur due to inaccurate scatter correction, and the artifacts affect the tumor visibility in F-FDG PET/CT images. We investigated the incidence rate and the mechanisms of halo-artifact generation and explored several scatter correction techniques to prevent artifacts.

Methods: We conducted patient and phantom studies.