Earticle

초록

영어

Background: The mid-term performance of clinical linear accelerator (LINAC) during volumetric modulated arc therapy (VMAT) treatment period is not performed in clinical practice and usually replaced with one-time plan quality assurance (QA). In this research we aim to monitor daily reproducibility of VMAT delivery from tracking individual leaf movement error and dosimetric error to evaluate the mid-term quality of the machine used. Materials and Methods: First, multileaf collimator (MLC) information was imported into MATLAB program to determine which of the MLC leaves in the leaf bank had the maximum RMS position error (maxRMS). We estimated where the maximum positional errors (maxPE) of the chosen leaf occur along its path length and tracked its daily variations over the entire treatment period. Secondly, picture information of dosimetric error from portal dosimetry was imported into MATLAB where representative high gamma index region (HGR) was determined as HGR with length of > 1 cm and their centers were daily tracked. Results and Discussion: The maxPEs in the brain and tongue cases were distributed broader than in other cases, but all data were found located within ± 0.5 mm. From first day to last day all of five cases show the similar visual pattern of HGRs and Centers of the longest HGRs remained within ± 1 mm of that in first day. These findings prove excellent mid-term performance of the LINAC used in VMAT treatments over a full course of treatment. Conclusion: Tracking the daily location changes of leaf movement and dosimetric error can be a good indicator of predicting the daily quality like stability and reproducibility of beam delivering in VMAT treatment.

목차

ABSTRACT
Introduction
Materials and Methods
1. Equipment and tools
2. Selection of VMAT plans
3. Positional tracking of MLC movement error
4. Positional tracking of dosimetric error
Results and Discussion
1. Positional tracking of MLC movement error
2. Positional tracking of dosimetric error
Conclusion
ACKNOWLEDGEMENT
REFERENCES

키워드

저자

• Mohammad Mahfujur Rahman [ Department of Nuclear Engineering, Hanyang University, Seoul, Korea ]
• Chan Hyeong Kim [ Department of Nuclear Engineering, Hanyang University, Seoul, Korea ]
• Seonghoon Kim [ Department of Radiation Oncology, Hanyang University Medical Center, Hanyang University, Seoul, Korea ] Corresponding Author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  방사선방어학회지 [Journal of Radiation Protection and Research]

• 간기

  계간

• pISSN

  2508-1888

• 수록기간

  1976~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 559 DDC 629