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Table 5 Estimated annual number of CT examinations for men (a) and for women (b) in Japan for each age range and anatomical locations scanned (*106).

From: Radiation Exposure from CT Examinations in Japan

  Age range (yo)
CT examination 0-19 20-29 30-39 40-49 50-59 60-69 70-79 80- Total
Head 0.10 0.17 0.23 0.29 0.50 0.73 1.14 1.34 4.50
Face 0.11 0.04 0.04 0.05 0.09 0.13 0.16 0.08 0.70
Neck 0.00 0.08 0.27 0.59 0.97 1.14 0.96 0.50 4.51
Chest 0.09 0.06 0.22 0.42 0.90 1.21 1.30 1.30 5.50
Upper abdomen 0.00 0.09 0.22 0.39 0.76 1.03 1.16 0.94 4.59
Lower abdomen 0.00 0.03 0.05 0.09 0.16 0.21 0.24 0.22 1.00
Total 0.30 0.47 1.03 1.83 3.38 4.45 4.96 4.38 20.80