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Original Article

Korean Journal of Medical Physics 2013; 24(4): 253-258

Published online December 30, 2013

Copyright © Korean Society of Medical Physics.

The Comparative Analysis of External Dose Reconstruction in EPID and Internal Dose Measurement Using Monte Carlo Simulation

몬테 카를로 전산모사를 통한 EPID의 외부적 선량 재구성과 내부 선량 계측과의 비교 및 분석

Joo-Young Jung, Do-Kun Yoon, Tae-Suk Suh

정주영ㆍ윤도군ㆍ서태석

Department of Biomedical Engineering, Research Institute of Biomedical Engineering, School of Medicine, The Catholic University of Korea, Seoul, Korea

가톨릭대학교 의과대학 의공학교실, 가톨릭대학교 생체의공학연구소

Received: October 16, 2013; Accepted: December 5, 2013

Abstract

The purpose of this study is to evaluate and analyze the relationship between the external radiation dose reconstruction which is transmitted from the patient who receives radiation treatment through electronic portal imaging device (EPID) and the internal dose derived from the Monte Carlo simulation. As a comparative analysis of the two cases, it is performed to provide a basic indicator for similar studies. The geometric information of the experiment and that of the radiation source were entered into Monte Carlo n-particle (MCNPX) which is the computer simulation tool and to derive the EPID images, a tally card in MCNPX was used for visualizing and the imaging of the dose information. We set to source to surface distance (SSD) 100 cm for internal measurement and EPID. And the water phantom was set to be 100 cm of the source to surface distance (SSD) for the internal measurement and EPID was set to 90 cm of SSD which is 10 cm below. The internal dose was collected from the water phantom by using mesh tally function in MCNPX, accumulated dose data was acquired by four-portal beam exposures. At the same time, after getting the dose which had been passed through water phantom, dose reconstruction was performed using back-projection method. In order to analyze about two cases, we compared the penetrated dose by calibration of itself with the absorbed one. We also evaluated the reconstructed dose using EPID and partially accumulated (overlapped) dose in water phantom by four-portal beam exposures. The sum dose data of two cases were calculated as each 3.4580 MeV/g (absorbed dose in water) and 3.4354 MeV/g (EPID reconstruction). The result of sum dose match from two cases shows good agreement with 0.6536% dose error.

KeywordsMCNPX, Monte Carlo simulation, EPID dose-reconstruction, Internal dose measurement, Calibration

Korean Society of Medical Physics

Vol.34 No.4
December 2023

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

Frequency: Quarterly

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