Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Improvement of Beam-Quality Evaluation Method for Medical Linear Accelerator Using Magnetic Field

  • Kim, Jeongho (Department of Radiation Oncology, Konyang University Hospital) ;
  • Han, Manseok (Department of Radiology, Kangwon National University) ;
  • Yoo, Sejong (Department of Radiology, Konyang University Hospital) ;
  • Kim, Kijin (Department of Radiology, Konyang University Hospital) ;
  • Cho, Jae-Hwan (Department of International Radiological Science, Hallym University of Graduate Studies)
  • Received : 2015.04.03
  • Accepted : 2015.06.15
  • Published : 2015.06.30
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Abstract

Beam-quality of medical linac evaluations vary by diverse factors. Because conventional beam-quality evaluation methods yield fragmentary results, a new beam-evaluation method is suggested, and its feasibility is evaluated. The PDDs (percentage depth doses) of 6 MV (Mega-voltage) and 10 MV photon, R (Range) of a 6 MeV (Mega Electron-voltage) and 9 MeV electron were measured and compared with the conventional evaluation methods, and the improved methods $PDD^{10}{_5}$, $PDD^{20}{_{10}}$, $PDD^{30}{_{20}}$, $PDD^{20}{_5}$, $PDD^{30}{_{10}}$, and $R^{70}{_{50}}$, $R^{50}{_{30}}$, $R^{70}{_{30}}$ as the magnetic field of the bending magnet was changed to +2% to -2%, and the results were compared. The comparison showed that the improved methods exhibit a higher discrimination than the conventional methods in each energy regime. $PDD^{10}{_5}$, $PDD^{30}{_{20}}$, $PDD^{30}{_{10}}$ and $R^{70}{_{50}}$, $R^{50}{_{30}}$ should be applied. These methods exhibit a higher discrimination in each energy regime than conventional beam-quality evaluation methods; therefore, they should be used for beam-quality evaluation according to the magnetic field variation.

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