Japanese Journal of Radiological Technology
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
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Estimation of Exposure Dose on MDCT Examination -The Measurement of Organ Dose and Effective Dose by Anthropomorphic Phantom-
Takumi HirataKenji InoueShinji ShigemoriMichitaka Matsuzaki,Kouji Inatomi
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2010 Volume 66 Issue 8 Pages 901-910

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Abstract

In order to evaluate the exposure dose in CT examinations, we measured the tissue and organ doses by test site in 4-row, 16-row, and 64-row multi detector CT by using an anthropomorphic phantom and fluorescent glass dosimeters. Furthermore, we calculated the effective dose by using the tissue weighting factor recommended by the ICRP in 2007. The effective dose in the head and neck examinations was 1.4–3.1 mSv, whereas the maximum skin dose was 278.9 mGy in head perfusion CT. The effective dose in examinations of the body trunk was 10.1–35.2 mSv. In addition, the organ dose and skin dose in the scanning range was similar to the CTDIvol in head and neck examinations, while it was higher than the CTDIvol in examinations of the body trunk. The exposure dose of patients undergoing CT is high in comparison to other radiological examinations. As a result, due to consecutive examinations, an absorbed dose of more than 100 mGy is possible. A future problem therefore remains how to lower the overall exposure dose with the introduction of new radiographic diagnostic modalities, such as phase scan or coronary CT angiography.

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© 2010 Japanese Society of Radiological Technology
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