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Table 3 Estimated annual number of CT examinations and collective dose in Japan.

From: Radiation Exposure from CT Examinations in Japan

CT examination   Annual number of CT examination (*106) Annual collective dose
(*103 Sv person)
Head Total 9.1 23.6
     Men    4.6    12.1
     Women    4.5    11.5
Face Total 1.4 2.8
     Men    0.7    1.5
     Women    0.7    1.3
Neck Total 10.1 26.5
     Men    5.6    14.8
     Women    4.5    11.7
Chest Total 12.5 120.0
     Men    7.0    67.8
     Women    5.5    52.2
Upper abdomen Total 10.3 83.1
     Men    5.7    47.1
     Women    4.6    36.0
Lower abdomen Total 2.1 21.3
     Men    1.1    12.0
     Women    1.0    9.3
Total Total 45.4 277.4
     Men    24.7    155.3
     Women    20.8    122.1