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Evaluation of OSLD and EBT3 film for dose, energy, and angular dependence

OSLD와 EBT3 필름의 선량, 에너지, 방향의존성에 대한 평가

  • Lee, Ju-seong (Department of Radiological Science, Eulji University) ;
  • Kang, Bo-ram (Department of Radiological Science, Eulji University) ;
  • Kwon, Hyeon-Kyung (Department of Radiological Science, Eulji University) ;
  • Park, Ji-Young (Department of Radiological Science, Eulji University) ;
  • Kim, Ju-Hye (Department of Radiation Oncology, Kyung Hee University Hospital at Gangdong) ;
  • Choi, Young-Se (Department of Radiation Oncology, Yonsei Cancer Center) ;
  • Kim, Daehong (Department of Radiological Science, Eulji University)
  • Received : 2013.05.23
  • Accepted : 2013.06.17
  • Published : 2018.06.30

Abstract

A radiation dosimeter is important to assess quality assurance (QA) of radiation therapy devices and to estimate the radiation dose in vivo dosimetry. Recently, optically stimulated luminescence detector (OSLD) is widely used in clinical filed. Therefore, the purpose of this study is to evaluate dose, energy, and angular dependence of OSLD and EBT3 film. The absorbed dose in clinical linear accelerator (Linac) beam is calibrated for dose per monitor unit (MU). Dose, energy, and angular dependence of OSLD and EBT3 film are estimated after the calibration procedure. The absorbed dose is measured at 50, 100, 150, and 200 cGy in an 6 MV X-ray beam for dose dependence. A dose of 150 cGy is delivered to OSLD and EBT3 film with 6 and 10 MV photon energies for energy dependence. For measurements of angular dependence, angular positions of gantry are $0^{\circ}{\pm}80^{\circ}$ with 6 MV at 150 cGy. The results of dose dependence is linear for OSLD and EBT3 film. For the results of energy dependence, errors were 0.39% and 0.03% for OSLD and EBT3 film, respectively. The results of dose for angular is decreased from $0^{\circ}$ to ${\pm}80^{\circ}$ for both OSLD and EBT3 film. When angle of $0^{\circ}$ is normalized to 1, and the dose is decreased to 60 and 66% at $80^{\circ}$ for OSLD and EBT3 film, respectively. Dose and energy dependence of OSLD and EBT3 film are measured within the recommendation of manufacturer. Angular dependence is increased from $0^{\circ}$ to ${\pm}80^{\circ}$ for OSLD and EBT3 film. The characteristics of OSLD and EBT3 film are similar and expected to useful for clinical field.

Keywords

References

  1. Ahmed, M. F., Shrestha, N., Schnell, E., Ahmad, S., Akselrod, M. S., and Yukihara, E. G. (2016). Characterization of $Al_2O_3$ optically stimulated luminescence films for 2D dosimetry using a 6 MV photon beam. Phys. Med. Biol., 61(21), 7551-7570. https://doi.org/10.1088/0031-9155/61/21/7551
  2. Alvarez, P., Kry, S. F., Stingo, F., and Followill, D. (2017). TLD and OSLD dosimetry systems for remote audits of radiotherapy external beam calibration. Radiat. Meas., 106, 412-415. https://doi.org/10.1016/j.radmeas.2017.01.005
  3. Endo, A., Katoh, T., Kobayashi, I., Joshi, R., Sur, J., Okano, T. (2012). Characterization of optically stimulated luminescence dosimeters to measure organ doses in diagnostic radiology. Dentomaxillofac Radiol. 41(3), 211-216. https://doi.org/10.1259/dmfr/98708146
  4. Lehmann, J., Dunn, L., Lye, J. E., Kenny, J. W., Alves, A. D., Cole, A., Asena, A., Kron, T., Williams, I. M. (2014). Angular dependence of the response of the nanoDot OSLD system for measurements at depth in clinical megavoltage beams. Med. Phys. 41(6), 061712-1-9. https://doi.org/10.1118/1.4875698
  5. Tien, C. J., Ebeling, R. 3rd., Hiatt, J. R., Curran, B., and Sternick, E., (2012). Optically Stimulated Luminescent Dosimetry for High Dose Rate Brachytherapy. Front. Oncol., 91(2), 1-7.
  6. Yusof, F. H., Ung, N. M., Wong, J. H. D., Jong, W. L., Ath, V., Phua, V. C. E., Heng, S. P., and Ng, K. H. (2015). On the Use of Optically Stimulated Luminescent Dosimeter for Surface Dose Measurement during Radiotherapy. Plos One, 10(6), e0128544. https://doi.org/10.1371/journal.pone.0128544
  7. Zhuang, A. H., and Olch, A. J. (2014). Validation of OSLD and a treatment planning system for surface dose determination in IMRT treatment. Med. Phys., 41(8), 81720. https://doi.org/10.1118/1.4890795