Radiation Protection Dosimetry Advance Access originally published online on July 18, 2009
Radiation Protection Dosimetry 2009 136(1):38-44; doi:10.1093/rpd/ncp138
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Evaluation of radiation doses from MDCT-imaging in otolaryngology
1 School of Health Sciences, Nagoya University, 1-1-20, Daikominami, Higashi-ku, Nagoya 461-8673, Japan
2 Section of Radiological Protection, National Institute of Radiological Sciences, 4-9-1, Anagawa, Inage-ku, Chiba 263-8555, Japan
3 Department of Radiology, Aichi Medical University Hospital, Nagakute, Aichi 480-1195, Japan
* Corresponding author: kawaura{at}met.nagoya-u.ac.jp
Received April 1, 2009, amended June 29, 2009, accepted June 29, 2009
The purpose of this study was to clarify patient doses in the current otolaryngological multi-detector row computed tomography (MDCT) examinations. Patient doses were measured with an in-phantom dosimetry system which was composed of 48 photodiode dosemeters embedded within an anthropomorphic phantom. Organ and effective doses were evaluated according to the International Commission on Radiological Protection Publication 103. In neck CT, doses for salivary glands and for thyroid were high, 7.6–29.9 and 13.4–60.3 mGy, respectively. In sinus CT, brain and lens doses were high, 7.6–24.6 and 10.6–32.0 mGy, respectively, and in inner ear CT, lens dose was 8.0–35.3 mGy. Effective doses were 1.8–6.6 mSv in neck CT, 0.5–0.9 mSv in sinus CT and 0.3–0.6 mSv in inner ear CT. The present dose data would be used to estimate radiation risks for patients undergoing otolaryngological MDCT examinations.