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KMID : 1038720150260040267
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Progress in Medical Physics
2015 Volume.26 No. 4 p.267 ~ p.272
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The Dose and Risk Reduction from Adoption of Automatic mA Control in 4D CT Scans
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Ko Young-Eun
Je Hyoung-Uk
Hwang Yeon
Park Sung-Ho
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Abstract
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In this study, the reduction of dose and risk was evaluated from using automatic mA control in 4D CT scan of patients whose organ movement was considered for gated radiotherapy. The organ doses, CTDI, effective doses from 4D CT with and without using automatic mA control were evaluated using CT-Expo program for each 10 patients of liver and lung cancer, and the risk of exposure induced death and loss of life expectancy were evaluated using PCXMC program. It was founded that there were 26.8%, and 15.5% dose reduction in organ doses and CTDI for liver and lung cancer patients and 16.5% and 19.8% risk reduction in liver and lung cancer patients. The organ doses and effective doses were evaluated for the parameter of each patient used in CT scans, and risks considering age and gender could be evaluated. It was founded that there were 21.2% dose reduction and 18.2% risk reduction in 4D CT scan using AEC for liver and lung cancer patients.
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KEYWORD
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4D-CT, Auto mA Control, CTDI, Effective dose, Risk of exposure induced death, Loss of life expectancy
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