Dosimetry
Basic dosimetry characteristics of a scanner related to:
- X-ray tube and beam filtration
- CT scanner geometry
Multi-slice scanners are similar in these respects to previous single slice scanners, however differences exist
- Z-axis geometric efficiency
- Scan protocols
Dosimetry of multi-slice scanners can be confusing due to:
- Varying definitions of pitch (pitchx, pitchd)
Manufacturers are making steps to control multi-slice doses
- mA modulation
- Paediatric protocols