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Korean Journal of Medical Physics 2013; 24(1): 48-53

Published online March 25, 2013

Copyright © Korean Society of Medical Physics.

Comparative Studies on Absorbed Dose by Geant4-based Simulation Using DICOM File and Gafchromic EBT2 Film

DICOM 파일을 사용한 Geant4 시뮬레이션과 Gafchromic EBT2 필름에 의한 인체 내 흡수선량 비교 연구

Eun Hui Mo*, Sang Ho Lee, Sung Hwan Ahn, Chong Yeal Kim

모은희*ㆍ이상호ㆍ안성환ㆍ김종일

*Department of Radiology, Wonkwang University Hospital, Iksan, Department of Radiological Science, Seonam University, Asan, Department of Radiation Science & Technology, Chonbuk National University, Jeonju, Korea

*원광대학교병원 영상의학과, 서남대학교 방사선학과, 전북대학교 방사선과학기술학과

Abstract

Monte Carlo method has been known as the most accurate method for calculating absorbed dose in the human body, and an anthropomorphic phantom has been mainly used as a method of simulating internal organs for using such a calculation method. However, various efforts are made to extract data on several internal organs in the human body directly from CT DICOM files in recent Monte Carlo calculation using Geant4 code and to use by converting them into the geometry necessary for simulation. Such a function makes it possible to calculate the internal absorbed dose accurately while duplicating the actual human anatomical structure. Thus, this study calculated the absorbed dose in the human body by using Geant4 associating with DICOM files, and aimed to confirm the usefulness by compare the result with the measured dose using a Gafchromic EBT2 film. This study compared the dose calculated using simulation and the measured dose in beam central axis using the EBT2 film. The results showed that the range of difference was an average of 3.75% except for a build-up region, in which the dose rapidly changed from skin surface to the depth of maximum dose. In addition, this study made it easy to confirm the target absorbed dose by internal organ and organ through the output of the calculated value of dose by CT slice and the dose value of each voxel in each slice. Thus, the method that outputs dose value by slice and voxel through the use of CT DICOM, which is actual image data of human body, instead of the anthropomorphic phantom enables accurate dose calculations of various regions. Therefore, it is considered that it will be useful for dose calculation of radiotherapy planning system in the future. Moreover, it is applicable for currently-used several energy ranges in current use, so it is considered that it will be effectively used in order to check the radiation absorbed dose in the human body.

KeywordsMonte Carlo method, Geant4, Gafchromic EBT2 film, DICOM

Korean Society of Medical Physics

Vol.35 No.2
June 2024

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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