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Other artifacts
•
Ghosting – Detector after-glow from previous exposure
•
Aliasing – Undersamplig of voxels far from the source due to the cone shape of the
beam
–
Cause the commonly seen lines from the center to the peripheral part of the
image
•
Patient motion
•
Non-ideal gantry rotation
–
Variation in gantry rotation speed
–
Sag of detector and/or X-ray source
Not corrected
Corrected
Rit et al. 2008
Schulze et al. 2011