Impact of Multileaf Collimator Leaf Positioning Accuracy on Intensity Modulated Radiation Therapy

DOI Web Site PubMed 21 References

Bibliographic Information

Other Title
  • マルチリーフコリメータの位置精度が強度変調放射線治療の線量分布に及ぼす影響
  • マルチリーフコリメータ ノ イチ セイド ガ キョウド ヘンチョウ ホウシャセン チリョウ ノ センリョウ ブンプ ニ オヨボス エイキョウ

Search this article

Abstract

In multileaf collimator (MLC)-based intensity modulated radiation therapy (IMRT), the dose is influenced by the uncertainty of MLC driving control. In this study, we examined the influence of MLC driving control accuracy on dose evaluation (gamma analysis) by evaluating 60-day MLC driving control accuracy (stationary positioning accuracy and positioning reproducibility) once a week as well as measuring IMRT dose distribution. The MLC positioning accuracy accompanied variation over time and tended to expand by 0.1 to 0.15 mm in one week and about 1 mm in 60 days. In terms of reproducibility, errors were within 0.2 mm for more than 95%. For prostate IMRT, when MLC stationary positioning accuracy was around 1 mm, no significant difference was observed in the pass rate in gamma analysis. Therefore, the results suggest that regular maintenance by setting a permissible value determined by the MLC positioning accuracy test can be an effective indicator in the future for maintaining the safety of IMRT.

Journal

References(21)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top