Understanding Imaging Performance (3): Artefacts
Artefacts in CT
Artefacts: definition
Types of artefact
Artefact origins
Beam hardening
Beam hardening effect on scan profile
Beam hardening: cupping artefact
Avoiding beam hardening artefacts
Beam hardening: calibration correction
Beam hardening correction software
Reduction of streaks and bands
Partial volume effect
Partial volume artefact
Partial volume artefacts
Minimizing partial volume artefacts
Photon starvation
Avoidance using mA modulation
Adaptive filtration
Multi-dimensional adaptive filtering
Effects of 3D filtration
Undersampling
Avoidance of undersampling artefacts
Metal artefacts
Avoidance of metal artefacts
Software corrections for metal artefacts
Metal Artefact Reduction
Patient motion artefacts
Minimizing motion artefacts
Motion artefact correction
Inadequate scan field
Detector sensitivity - Ring artefacts
Ring artefacts
Artefacts in helical scanning
Artefacts in the transverse plane
Helical artefacts (Pitch 2)
Helical artefacts - Abdomen
Minimization of helical artefacts
Artefacts in multiplanar and 3D reconstructions
Stair step artefacts
Zebra artefact
Multislice scanner artefacts
Appearance of helical artefacts in multi-slice
“Windmill” artefact
Windmill artefact in consecutive slices
Effect of interpolator on artefacts
Effect of pitch on artefacts
Cone beam effect
Cone beam effect (2)
Cone beam effect (3)
Cone beam effect (4)
Cone beam artefact
Cone beam reconstruction
Effectiveness of cone beam algorithm
Conclusions
Author: ImPACT
E-mail: impact@impactscan.org
Homepage: http://www.impactscan.org/
ImPACT course presentation index: http://www.impactscan.org/impactcourseslides.htm