Vatech A9, User Manual, Page: 187 / 196

15. Appendices
vatech A9 (Model name: PHT-30CSS) User Manual 187
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compared to conventional dental X-ray imaging. Several studies have
investigated the radiation doses involved in dental CBCT for adults, but none
have investigated pediatric doses. This study estimates the organ and effective
doses to two pediatric tissue-equivalent phantoms using thermoluminescent
dosimeters for three dental CBCT units and six imaging protocols. The doses to
the thyroid, salivary glands and brain ranged from 0.068mSv to 1.131mSv,
0.708mSv to 2.009mSv and 0.031mSv to 1.584mSv respectively. The skin and
red bone marrow have received much lower doses than the other three organs.
The effective doses ranged from 0.022 mSv to 0.081 mSv. The effective doses
calculated in this study were much higher than these of panoramic X-ray imaging
but lower than conventional CT
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CHIYO YAMAUCHI-KAWAURA & KEISUKE FUJII & TAKAHIKO AOYAMA &
SHUJI KOYAMA & MASATO YAMAUCHI:
Radiation dose evaluation in the head and neck MDCT examinations with a 6-
year-old child anthropomorphic phantom, Pediatr Radiol (2010) 40:1206–1214
DOI 10.1007/s00247-009-1495-z
Background: CT examinations of the head and neck are the most commonly
performed CT studies in children, raising concerns about radiation dose and their
risks to children.
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 the mean organ dose in brain CT was 34.3 mGy
for the brain. Maximum values of mean doses for the radiosensitive lens and
thyroid were 32.7 mGy for a lens in brain CT and 17.2 mGy for thyroid in neck CT.
The 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.
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