Abstract： Objective To verify and adjust the leaf position accuracy of a multi-leaf collimator (MLC) in a linear accelerator. Methods Ionization chamber arrays (StarTrack, IBA) were used to measure the leaf position accuracy of a MLC in a linear accelerator (Precise, ELEKTA) and adjust the leaves out of tolerance. Results After the adjustment of leaf position of the MLC, the analysis of the verification films taken at the offset position showed that the leaf position of the MLC was accurate. Conclusions The method developed in this study is convenient and simple for measurement and calibration of leaf position of the MLC in the linear accelerator, which meets the MLC position accuracy requirement for the linear accelerator.
Huang Yanqiu,Qiu Lingping,Zhou Chunjun. Verification and calibration of leaf position of a multi-leaf collimator by ionization chamber arrays[J]. Chinese Journal of Radiation Oncology, 2016, 25(3): 279-281.
[1] Mu G,Ludlum E,Xia P.Impact of MLC leaf position errors on simple and complex IMRT plans for head and neck cancer[J].Phys Med Biol,2008,53(1):77-88.DOI:10.1088/0031-9155/53/1/005. [2] 蔡汉飞,沈学明,李贵.基于辐射自显影胶片的MLC校准[J].临床影像技术,2009,24(7):141-144.DOI:10.3969/j.issn.1674-1633.2009.07.064. Cai HF,Shen XM,Li G.Calibration of multi-leaf collimator with GAFCHROMIC EBT film[J].Clin Imag Technol,2009,24(7):141-144.DOI:10.3969/j.issn.1674-1633.2009.07.064. [3] 鞠忠建,王运来,马林,等.用二维电离室矩阵验证MLC叶片到位精度[J].中华放射肿瘤学,2006,15(4):335-338.DOI:10.3760/j.issn:1004-4221.2006.04.019. Ju ZJ,Wang YL,Ma L,et al. Verification of accuracy of multileaf collimator leaf position using a two-dimensional ion chamber array[J].Chin J Radiat Oncol,2006,15(4):335-338.DOI:10.3760/j.issn:1004-4221.2006.04.019. [4] 吴昊,任民,黄雯增,等.不同探测器在MLC质量保证中的定位精度比较[J].中国医学物理学杂志,2010,27(4):1960-1963.DOI:10.3969/j.issn.1005-202X.2010.04.003. Wu H,Ren M,Huang WZ,et al. Comparison of the positioning accuracy in MLC quality assurance using various detectors[J].Chin J Med Phys,2010,27(4):1960-1963.DOI:10.3969/j.issn.1005-202X.2010.04.003.
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