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Radiation Protection Dosimetry Advance Access published online on June 26, 2007
Radiation Protection Dosimetry, doi:10.1093/rpd/ncm244
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

PATIENT DOSE ESTIMATION FOR MULTI-DETECTOR-ROW CT EXAMINATIONS

Kanae Nishizawa1,*, Shin-Ichiro Mori1, Mari Ohno1, Noriyuki Yanagawa2, Takashi Yoshida3, Keiichi Akahane1, Kazuo Iwai4 and Shin-Ichi Wada5

1 Radiological Protection Section, Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
2 Department of Radiology, Chiba University Hospital, 1-8-1 Chuoh-ku Inohana Chiba, Japan
3 Department of Radiology, Kyorin University Hospital, 6-20-2 Shinkawa, Mitaka-shi, Tokyo 181-8611, Japan
4 Department of Radiology, Nihon University School of Dentistry, 1-8-13 Kanda Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan
5 Faculty of Medicine, Niigata University, 746 Asahimachi-dori, 2-bancho, Niigata 951-8518, Japan

* Corresponding author: nisizawa{at}nirs.gp.jp

Received February 22, 2007, amended April 9, 2007, accepted April 18, 2007

The spread of Multi-detector-row computed tomography (MDCT) has been remarkable. Here, various organ and tissue doses were evaluated with six types of MDCT scanners in common use in Japan; using thermoluminescence dosimeters and anthropomorphic phantoms under condition of routine clinical examinations of the chest in adult and child, of the head in child and of the abdomen-pelvis in adult. Estimated lung doses and averaged effective dose in chest examinations were 19.2 ± 2.03 mGy and 9.54 ± 0.90 mSv for the adult and 15.7 ± 1.88 mGy and 7.42 ± 0.82 mSv for the child phantom, respectively. The numerical difference between effective dose and organ or tissue doses was about 2–2.5 times. For the adult abdomen-pelvis examinations, averaged effective dose was 13.0 ± 3.72 mSv. Averaged effective dose for the child head examinations was 2.6 ± 1.32 mSv. In one case, the dose approached 80 mGy for the brain in the head examination, giving a difference from the effective dose of 10 times or more.


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