Helical and Multi-Slice Principles
The advent of helical CT
Helical scanning
Helical pitch
Helical Pitch
Image reconstruction in helical CT
360º linear interpolation
PPT Slide
180º linear interpolation
Types of interpolation algorithm
Advantages of helical scanners
Multi-slice scanners
Multi-slice scanning
Advantages over single slice
Shorter time ? fewer motion artefacts
Thinner slices ? better z-axis resolution
Thinner slices ? better MPRs
Thinner slices ? better 3D images
Longer volumes?? more useful scans
Advantages of more slices/rotation
Reconstructing different slice widths
Multi-slice detector technology
Detector arrays and slice width
Matrix & adaptive detector arrays
Effects of array design
Slice widths and total imaged length/rotation
Geometric efficiency
Versatility
8-slice and 16-slice systems
Multi-slice helical scanning
Helical pitch in single slice CT
Helical pitch in multi-slice CT
Pitchx and Pitchd
Interpolation algorithms in MSCT
Methods of image reconstruction
2-point interpolation at different pitches
Filter interpolation at different pitches
Weighting functions
Are there optimum pitches in multi-slice?
Optimum pitch for GE multi-slice
Pitch and multi-slice image quality
Effect of pitch on artefacts
Optimising pitch to reduce artefacts
In conclusion
Email: julia@impactscan.org
Home Page: www.impactscan.org