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Original Article

Korean Journal of Medical Physics 2008; 19(4): 241-246

Published online December 25, 2008

Copyright © Korean Society of Medical Physics.

Development of Respiratory Signal Analysis Program for Accurate Phase Reassignment in 4D CT Reconstruction

4D CT 영상 재구성 시 정확한 위상 변환을 위한 호흡 신호 분석 프로그램 개발

Hae-Jin Park*, Won-Gyun Jung*, Jai-Woong Yoon*, Ju-Young Song, Tae-Suk Suh*

박혜진*ㆍ정원균*ㆍ윤제웅*ㆍ송주영ㆍ서태석*

*Department of Biomedical Engineering, The Catholic University of Korea, Seoul,Department of Radiation Oncology, The Chonnam National University Medical School, Gwangju, Korea

*가톨릭대학교 의과대학 의공학교실, 전남대학교 의과대학 방사선종양학교실

Abstract

Patient's respiration can have an effect on movement of tumor range and peripheral organs. Therefore, the respiratory signal was acquired by relation between external markers and movement of patient's abdomen during radiational therapy in order to minimize the effect of respiration. Based on this technique, many studies of rational therapy to irradiate at particular part of stable respiratory signals have executed and they have been clinically applied. Nevertheless, the phase-based method is preferred to the amplitude-based method for the rational therapy related to respiration. Because stabilization of the respiratory signal are limited. In this study, a in-house respiratory signal analysis program was developed for the phase reassignment and the analysis of the irregular respiratory signals. Various irregular respiratory patterns was obtained from clinical experimental volunteers. After then, the in-house program analyzed the factors affecting to phase assignment which is directly related to irradiated sector. Subsequently, accuracy of phase assignment was improved with removement of irregular signals by self-developed algorithm. This study is considered to be useful for not only image reconstruction and elevation of irradiating accuracy through phase assignment of RPM system but also analysis of respiratory signals. Moreover, development of 4D CT image is planed with phantom researches or clinical experiments based on this program.

KeywordsRespiratory gated radiotherapy, Phase-based gating, Four-dimensional CT simulation

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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