1989 – NRPB survey
- CT: 2% of examinations, 20% of collective dose
1999 – NRPB estimates
- CT: 4% of examinations, 40% of collective dose
It is likely that overall doses from CT have risen due to introduction of MSCT
- Wider range of examinations being performed
- Longer scans, more phases and higher mAs for narrow slices are possible
Important to recognise the benefits, also!