What is the radiation exposure with CT colonography (CTC)?

Thin slice-low dose 

  • Must use low dose protocol
  • Effective mAs 50
  • kV 120
  • Pitch 6
  • Collimation 1 mm

Effective radiation dose similar to BE

  • 5.0 mSv for males
  • 7.8 mSv for females

(Macari et al. Radiology 2002; 224-383)

Radiation Exposure

  • Annual background 3 mSv
  • Higher altitudes  +1.5 mSv
  • CXR                      . 1 mSv
  • Mammogram         .7 mSv
  • Upper GI                 2 mSv
  • DCBE                 4-8 mSv
  • Chest CT              8 mSv
  • Abdomen CT       10 mSv

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