| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
The aim of this study is to investigate scan protocols appropriate for CT examinations based on the evaluation of radiation doses and image quality. We built Monte Carlo (MC) simulation models for adult and pediatric abdomen-pelvis CT scans with tube current modulation (TCM) and evaluated organ doses in the CT examinations using the simulation models. The doses were compared with those measured using adult and pediatric anthropomorphic phantoms and radio-photoluminescence glass dosimeters. We also developed an image quality phantom representing an adult abdominal shape. The image quality phantom was scanned with fixed tube current and TCM protocols which deliver almost the same CT dose index, and the radiation doses and image quality were evaluated. The results showed that dose distribution in CT scans with TCM was more uniform, and image noise on CT images obtained with TCM decreased in some regions.
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