- It was estimated that there was a 600% increase in all CT examinations
for the decade spanning the mid 1980s to mid 1990s.5
- It is estimated that 4% of diagnostic radiology procedures are CT
exams, but their contribution to the collective dose is 40%.1
- Larger attributable lifetime risk of cancer after childhood exposure;
therefore, a given radiation dose to a child is of greater public health
significance than the same dose in an adult.1
- Children are inherently more sensitive to radiation simply because
they have more dividing cells and radiation basically acts on dividing
cells and children have more time to express a cancer than do adults.4
- Much data ultimately derived from Japanese atomic bomb survivors.
At exposure doses relevant to doses used in CT exams, there does not
appear to be a threshold in dose below which no excess risk exists.7
D, et al. Estimated risks of radiation-induced fatal cancer from pediatric
CT. Am J Roentgenol 2001; 176: 289-96
P, et al. Intracranial tumors after exposure to ionizing radiation during
infancy: a pooled analysis of two Swedish cohorts of 28,008 infants
with skin hemangioma.
S. CT scans in children linked to cancer later. USA Today. January 22,
WE. Editorial commentary on Roebuck DJ: Risk and benefit in paediatric
radiology. Pediatr Radiol 1999;29:721.
DJ. Estimating cancer risks from pediatric CT: going from the qualitative
to the quantitative. Pediatr Radiol. 2002; 32:228-231.
DL, et al. Studies of mortality of atomic bomb survivors. Report 13:
Solid cancer and noncancer disease mortality: 1950-1997. Radiat Res.