CT dose descriptors
Computed Tomography Dose Index (CTDI)
- CTDI100 , CTDIw , CTDIvol
- CTDIw =1/3CTDIc +2/3CTDIp
- CTDIvol = CTDIw / pitch
c = centre positon, p= periphery position
Dose Length Product
- DLP = CTDIvol x length irradiated
- DLP = average dose x length irradiated