Table of contentsCT Technology Update, part 1 of 2
Overview
Who we are
About ImPACT
ImPACT
CT scanner development 1972 2004
Slide 7
Technological advances, 1985 - 2004
Four slice scanners
Multi-slice detectors
Slide 11
Slide 12
Four slice detector groups
Slide 14
Scan flexibility
Four slice detector matrices
Multi-slice helical scanning
Multi-slice helical interpolation
Interpolation at different pitches
Pitch in multi-slice
Slide 21
Slide 22
Slide 23
Sixteen slice scanners
Sixteen slice detectors
Advantages of multi-slice
Faster
Thinner
Slide 29
Isotropic resolution
Longer
Issues in Multi-slice
Cone beam artefacts: 16 slice
Cone beam effects - axial
Cone beam artefacts - helical
ASSR reconstruction techniques for 16 slice scanners
Effect of ASSR
AMPR algorithm (Siemens)
AMPR Algorithm
Testing of AMPR algorithm
Slide 41
Cone beam imaging: Feldkamp reconstruction
Helical Feldkamp with weighting functions (Toshiba)
Cone beam reconstruction techniques
Workflow implications
More Detectors - More Data
Dosimetry in multi-slice CT
Extra beam width in z-axis
Slide 49
Extra beam width in z-axis: z-axis geometric efficiency
Slide 51
Multi-slice dose issues: scan protocols
Multi-slice dose issues : helical scanning
Automatic exposure control (AEC)
Automatic mA adjustment
Automatic exposure control
Slide 57
What’s available now
Results from automatic mA systems
Multi-slice dose issues: paediatric protocols
Artefacts in Multi-slice
Slide 62
Appearance of helical artefacts in multi-slice
“Windmill” artefact
Windmill artefact in consecutive slices
Slide 66
CT technology update
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