@article{oai:repo.qst.go.jp:00045698,
 author = {Fujii, Keisuke and Aoyama, Takahiko and Kawaura, Chiyo and Koyama, Shuji and Yamauchi, Masato and Ko, Susumu and Akahane, Keiichi and Nishizawa, Kanae and 藤井 啓輔 and 赤羽 恵一 and 西澤 かな枝},
 issue = {984},
 journal = {British Journal of Radiology},
 month = {Dec},
 note = {The objective of this study was to evaluate organ dose and the effective dose to patients undergoing routine adult and paediatric CT examinations with 64-slice CT scanners and to compare the doses with those from 4, 8 and 16 multi-slice CT scanners.  Patient doses were measured with small sized - less than 7mm wide - silicon-photodiode dosimeters, 34 in number, which were implanted at various tissue and organ positions within adult and 6-year-child anthropomorphic phantoms.  Output signals from photodiode dosimeters were read out on a personal computer, from which organ and effective doses were computed.  For the adult phantom, organ doses for organs within scan range and effective doses were 8-35 mGy and 7-18 mSv in chest CT, and 12-33 mGy and 10-21 mSv in abdominopelvic CT.  For the paediatric phantom, these were 4-17 mGy and 3-7 mSv in chest CT, and 5-14 mGy and 3-9 mSv in abdominopelvic CT.  Doses for organs at the boundaries of scan length were higher for 64-slice CT scanners using large beam widths and/or large pitch because of larger extent of overranging.  CTDIvol, DLP and the effective dose in 64-slice CT for the adult and paediatric phantoms were the same levels as those obtained in 4, 8 and 16-slice CT.  Conversion factors of DLP to the effective dose by ICRP Pub.103 were 0.024 and 0.019 mSv mGy-1 cm-1 for respectively adult chest and adult abdominopelvic CT scans.},
 pages = {1010--1018},
 title = {Radiation dose evaluation in 64-slice CT examinations with adult and paediatric anthropomorphic phantoms},
 volume = {82},
 year = {2009}
}