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Original Article

Korean Journal of Medical Physics 2004; 15(2): 63-68

Published online June 25, 2004

Copyright © Korean Society of Medical Physics.

Comparison Study of Conventional Film-based and CT-reconstruction method in HDR Brachytherapy

고선량률 근접 방사선 치료에서 기존의 필름 방법과 CT 재구성 방법의 비교 연구

Ji-Na Chang*, Tae-Suk Suh*, Hyoung-Koo Lee*, Sei-Chul Yoon

장지나*·서태석*·이형구*·윤세철

*Department of Biomedical Engineering, College of Medicine, Catholic University, Seoul, Korea, Department of Radiation Oncology, Kangnam St. Mary's Hospital, Seoul, Korea

*가톨릭대학교 의과대학 의공학교실, 가톨릭대학교 강남성모병원 치료방사선과

Abstract

HDR brachytherapy administers a large dose of radiation in a short time compare with LDR, and its optimization for treatment is related to several complex factors, such as physical, radiation and optimization algorithms, so there is a need for these to be verified for accurate dose delivery. In our approach, a previous study concerning the phantom for dose verification has been modified, and a new pelvic phantom fabricated for the purpose of localization, including a structure enabling the use of a CT or MRI system. In addition, a comparison study was performed to verify an orthogonal method that is commonly used for brachytherapy localization by comparing target coordinates from a CT system. Since the developed phantom was designed to simulate the clinical setups of cervix cancer, it included an air-filled bladder and a rectum structure shaped sphere and cylinder. An N-shaped localizer was used to obtain precision coordinates from both CT and films. Moreover, the IDL 5.5 software program for Windows was used to perform coordinates analysis based on an orthogonal algorithm. The film results showed differences within 1.0 mm of the selected target points compare with the CT coordinates. For these results, a Plato planning system (Nucletron, Netherlands) could be independently verified using this phantom and software. Furthermore, the new phantom and software will be efficient and powerful quality assurance (QA) tools in the field of brachytherapy QA.

KeywordsHDR brachytherapy, A pelvic phantom, Comparison of coordinates

Korean Society of Medical Physics

Vol.35 No.4
December 2024

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

Frequency: Quarterly

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