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| Head doses and effects of shielding for head CT scan of children phantom model |
| ZHANG Yuheng1,2, CHEN Yingmin1, CHEN Rui1, ZHAO Jianshe3, LIU Zhaotian3 |
1. Institute of Radiation Medicine Shandong Academy of Medical Sciences, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan 250062 China;
2. School of Medicine and Life Sciences, University of Jinan-Shandong Academy of Medical Sciences;
3. Qilu Children's Hospital of Shandong University |
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Abstract Objective This study showed the effective dose and the absorbed doses of organs and tissues, and discussed the effects of shielding for head CT scan by using children phantom model.Methods This study simulated children head CT scan under clinical condition with Discovery CT 750 HD by setting the thermoluminescent dosimeters in one-year old and ten-year old phantom, gained the absorbed dose of organs and calculated effective dose in children under condition of 0.5 mmPb lead clothes wrapping shielding measure in non-scanning areas, and without taking any protective measures, and studied the shielding effect of lead clothes in children head CT examination.Results For the head CT examinations of the one-year old phantom, compared with no shielding, the doses of main organs such as thyroid, lung, stomach, intestine and breast, reduced at least 40.4%，and the effective dose reduced from 4.9 mSv to 2.2 mSv by 55.7%. For the head CT examinations of the ten-year old phantom, compared with no shielding, the doses reduced at least 39.5%, and the effective dose reduced from 2.4 mSv to 1.7 mSv by 30.5%.Conclusion Shielding protection can significantly decrease the effective dose and the absorbed dose of tissues and organs in children.
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Received: 18 September 2019
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