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