How to reduce dose in CT scans

  • Use automatic exposure control
  • Weight-based modulation
  • Size-based modulation
  • Gated modulation like ECG
  • Reduce tube current
  • Reduce tube potential
  • Beam-shaping filters
  • Restrict length of coverage to area of interest
  • Higher pitch (increase table speed)
  • Use wider collimation
  • Faster gantry rotation time 
  • Detectors with higher radiation sensitivity
  • Patient shielding
  • Iterative reconstruction techniques