Patient organ doses from CT based on absorbed dose-to-water dosimetry using cylindrical water phantoms.

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K09897
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Radiation science
• Research Institution: Kumamoto University
• Principal Investigator: Araki Fujio 熊本大学, 大学院生命科学研究部(保), 教授 (00295148)
• Co-Investigator(Kenkyū-buntansha): 大野 剛 熊本大学, 大学院生命科学研究部(保), 助教 (20646971)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: Multi-detector CT / Monte Carlo simulation / CT dosimetry / organ dose / 被ばく線量

Outline of Final Research Achievements

In this study, we evaluated patient organ dose based on absorbed water-to-dose measurements using cylindrical water phantoms. (1) The sources for four commercial MDCT scanners were modeled with the Monte Carlo method based on Al-attenuation curves and lateral dose profiles in free air. (2) The absorbed dose to water in cylindrical water phantoms was measured with a Farmer-type ionization chamber and was calculated by Monte Carlo method (3) The patient organ dose was calculated from dose volume histograms obtained by the Monte Carlo method using CT images. (4) The reduction of the exposure dose investigated by simulating a tube-current modulation technique using the Monte Carlo method.

Free Research Field

放射線線量計測学