CT Artifacts

Figure A. Ring artifacts resulting from defective detector element in 3rd generation single-slice scanner.
Figure B. Ring-like artifacts in clinical brain and abdominal images, resulting from x-ray tube arc during air calibration on 3rd generation 16-slice scanner
Figure C. Streak artifact from biopsy needle during CT-guided abdominal biopsy.
Figure D. Shading from missing data in shadow of biopsy needle.