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16. Appendices
Materials and methods: Radiation doses were measured with small-sized
siliconphotodiode dosimeters that were implanted at various tissue and organ
positions within a standard 6-year-old anthropomorphic phantom. Organ and
effective doses of brain CT were evaluated for 19 protocols in nine hospitals on
various (2–320 detector rows) MDCT scanners.
Results: The maximum value of mean organ dose in brain CT was 34.3 mGy for
brain. Maximum values of mean doses for the radiosensitive lens and thyroid
were 32.7 mGy for lens in brain CT and 17.2 mGy for thyroid in neck CT. seventy-
fifth percentile of effective dose distribution in brain CT was approximately the
same as the diagnostic reference level (DRL) in the 2003 UK survey.
2) Websites
For additional information on pediatric X-ray imaging, please refer to the websites
below.
http://www.fda.gov/radiation-

emittingproducts/radiationemittingproductsandprocedures/medicalimaging/ucm29
8899.htm
http://www.imagegently.org/
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