Discrepancies between Calculated and Delivered Dose Distributions of Respiratory Gated IMRT Fields according to the Target Motion Ranges for Lung and Liver Cancer Patients

Progress in Medical Physics 2014년 25권 4호 p.242 ~ p.247

김영국(Kim Young-kuk) - Dong-A University Department of Physics
노태익(Ro Tae-Ik) - Dong-A University Department of Physics
정태식(Jeung Tae-Sig) - Kosin University College of Medicine Department of Radiation Oncology
마선영(Ma Sun-Young) - Kosin University College of Medicine Department of Radiation Oncology
최지훈(Choi Ji-Hoon) - Kosin University College of Medicine Department of Radiation Oncology
임상욱(Lim Sang-Wook) - Kosin University College of Medicine Department of Radiation Oncology

Abstract

To see the discrepancies between the calculated and the delivered dose distribution of IMRT fields for respiratory-induced moving target according to the motion ranges. Four IMRT plans in which there are five fields, for lung and liver patients were selected. The gantry angles were set to 0° for every field and recalculated using TPS (Eclipse Ver 8.1, Varian Medical Systems, Inc., USA). The ion-chamber array detector (MatriXX, IBA Dosimetry, Germany) was placed on the respiratory simulating platform and made it to move with ranges of 1, 2, and 3 cm, respectively. The IMRT fields were delivered to the detector with 30~70% gating windows. The comparison was performed by gamma index with tolerance of 3 mm and 3%. The average pass rate was 98.63% when there's no motion. When 1.0, 2.0, 3.0 cm motion ranges were simulated, the average pass rate were 98.59%, 97.82%, and 95.84%, respectively. Therefore, ITV margin should be increased or gating windows should be decreased for targets with large motion ranges.

키워드

Gated radiation therapy, IMRT, Gamma index, Moving phantom
원문 및 링크아웃 정보
등재저널 정보
학술진흥재단(KCI) KoreaMed 
주제코드
주제명(Target field)
연구대상(Population)
연구참여(Sample size)
대상성별(Gender)
질병특성(Condition Category)
연구환경(Setting)
연구설계(Study Design)
연구기간(Period)
중재방법(Intervention Type)
중재명칭(Intervention Name)
키워드(Keyword)
유효성결과(Recomendation)
내부표적부피(internal target volume, ITV) margin should be increased or gating windows should be decreased for targets with large motion ranges.
연구비지원(Fund Source)
근거수준평가(Evidence Hierarchy)
출판년도(Year)
참여저자수(Authors)
대표저자
KCD코드
ICD 03
건강보험코드