Vatech PAX-I, User Manual

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PaX-i (PCH-2500) User Manual
133
Appendices
Objective
: The purpose of this study was to clarify radiation dose levels
for children of 6 years of age undergoing head and neck multi-detector CT
(MDCT) examinations.
Materials and methods
: Radiation doses were measured with small-sized
silicon-photodiode 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 the brain. Maximum values of mean doses for the radiosensitive
a 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.
Pi_u272_en_20180514.indd 133 2018-05-14 오전 11:03:33