Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2014, Vol. 25 ›› Issue (S1): S010201 doi: 10.13538/j.1001-8042/nst.25.S010201

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS •     Next Articles

An improved method for analyzing the output stability of medical LINAC based on planar dose

WANG Yu, XU Gong-Ming,REN Qiang, PEI Xi, CAO Rui-Fen, and HU Li-Qin   

  1. 1University of Science and Technology of China, Hefei 230027, China
    2Key Laboratory of Neutronics and Radiation Safety, Institute of Nuclear
    Energy Safety Technology, Chinese Academy of Sciences, Hefei 230031, China
    3Engineering Technology Research Center of Accurate Radiotherapy of Anhui Province, Hefei 230031, China
    4Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions,SuZhou 215006, China
  • Contact: HU Li-Qin E-mail:liqin.hu@fds.org.cn
  • Supported by:

    National Natural Science Foundation of China (Nos.
    81101132, 11305203) and Natural Science Foundation of Anhui Province
    (Nos. 11040606Q55, 1308085QH138)

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WANG Yu, XU Gong-Ming, REN Qiang, PEI Xi, CAO Rui-Fen, and HU Li-Qin. An improved method for analyzing the output stability of medical LINAC based on planar dose.Nuclear Science and Techniques, 2014, 25(S1): S010201     doi: 10.13538/j.1001-8042/nst.25.S010201

Abstract:

The absolute dose difference of the iso-center position at different times was used to evaluate the stability
of medical linear accelerator (LINAC). In order to eliminate the drawback of point dose without statistical
significance and to investigate the output stability of segment with small weight related to Intensity-modulated
Radiotherapy (IMRT), a modified method of evaluating the stability of LINAC was proposed based on planar
dose combined with gamma method. With a commercial available two-dimensional ionization chamber, a set of
planar doses with dose gradient from 2 cGy to 100 cGy were obtained. Then the gamma method was adopted to
analyze the dose difference between the Reference Data and the Evaluated Data at each dose level. The results
showed that (1) the improved method for analyzing the output stability of medical LINAC based on planar dose
was feasible and efficient; (2) the segment weight related to IMRT was under 10 MU in reverse optimization
should be aborted in clinical.

Key words: Planar dose, Gamma method, Medical LINAC, Output stability