Evaluation of scan protocols appropriate for patient-size in adult and pediatric CT examinations

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K19202
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Medical Physics and Radiological Technology
• Research Institution: Nagoya University
• Principal Investigator: Fujii Keisuke 名古屋大学, 医学系研究科(保健), 助教 (40469937)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 医療被ばく / CT / 線量評価 / 画質評価

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.

Free Research Field

放射線防護学