INDRODUCTI ON OF CT DISCOVERY OF CT MOTION IN ARTIFACTS TYPES OF ARTIFACTS IN CT SCAN ADVANTAGES OF CT ARTIFACTS IN CT SCAN METAL ARTIFACTS BEAM HARDENING ARTIFACTS Beam-Hardening Image PARTIAL VOLUME ARTIFACTS Partial Volume Image RING ARTIFACTS Blurring Artifacts (Volume Averaging) Blurring Artifacts Image Stair-Step Artifacts Image Created By EXIT
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INDRODUCTION OF CT
INDRODUCTION OF CT
DISCOVERY OF CTDISCOVERY OF CT
MOTION IN ARTIFACTSMOTION IN ARTIFACTS
TYPES OF ARTIFACTS IN CT SCANTYPES OF ARTIFACTS IN CT SCAN
Associated with inclined surfaces inreformatted slices
Causes• Large reconstruction interval• Asymmetric helical interpolation
Correction• Collimation and feed less than feature sizes,
and small reconstruction interval• Adaptive interpolation
Stair-step Artifacts
Stair-step artifact. (A) Axial CT shows central low attenuation in the right lower lobe pulmonary artery raising suspicion for pulmonary embolus (arrow). (B) Coronal reformatted image shows linear low attenuation across the vessel from data misregistration along z-axis.