Evaluation of two radiochromic films for HVL measurement

T. Gotanda, T. Katsuda, R. Gotanda, A. Tabuchi, K. Yamamoto, T. Kuwano, H. Yatake, K. Kashiyama, K. Yabunaka, T. Akagawa, Yoshihiro Takeda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Although the half-value layer (HVL) is one of the important parameters for quality assurance (QA) and quality control (QC), constant monitoring has not been performed because measurements using an ionization chamber (IC) are time-consuming. To solve these problems, a method using radiochromic film and step-shaped aluminum (Al) filters has been developed. In this study, GAFCHROMIC EBT2 dosimetry film (GAF-EBT2) and GAFCHROMIC XR TYPE-R dosimetry film (GAF-R) has been used. The measurement X-ray tube voltage was 120 kV. Two radiochromic films were scanned using a flat-bed scanner. To remove the nonuniformity error of scanned images, image J version 1.40g image analysis software has been used. HVL was evaluated using the density attenuation ratio. The HVLs and second HVLs of GAF-EBT2, GAF-R, and an IC dosimeter were compared. The HVLs (second HVLs) at 120 kV using GAF-EBT2, GAF-R, and an IC dosimeter were 4.47 mm (10.97 mm), 4.17 mm (8.61 mm), and 4.03 mm (10.35 mm) respectively, and the effective energies were 40.6 keV, 39.3 keV, and 38.7 keV, respectively. The difference ratios of the second HVLs using GAF-EBT2 (GAF-R) and an IC dosimeter were 6.0% (- 16.8%), -10.6% (-11.6%), and 5.1% (-0.2%), respectively. In addition, the difference ratio of the second HVLs at 120 kV using GAF-EBT2 and GAF-R was 27.4%. GAF-EBT2 and GAF-R proved to be capable of measuring effective energy within an error range of less than 5%. However, in HVL measurements of devices operating in the high-energy range (X-ray CT, radiotherapy machines, and so on), GAF-EBT2 was found to offer higher measurement precision than GAF-R, because it shows only a slight energy dependency.

Original languageEnglish
Title of host publicationIFMBE Proceedings
Pages53-56
Number of pages4
Volume37
DOIs
Publication statusPublished - 2011

Fingerprint

Dosimetry
Ionization chambers
Dosimeters
X ray tubes
Radiotherapy
Quality assurance
Aluminum
Image analysis
Quality control
X rays
Monitoring
Electric potential

Keywords

  • effective energy
  • half-value layer
  • quality assurance
  • quality control
  • radiochromic film

ASJC Scopus subject areas

  • Biomedical Engineering
  • Bioengineering

Cite this

Gotanda, T., Katsuda, T., Gotanda, R., Tabuchi, A., Yamamoto, K., Kuwano, T., ... Takeda, Y. (2011). Evaluation of two radiochromic films for HVL measurement. In IFMBE Proceedings (Vol. 37, pp. 53-56) https://doi.org/10.1007/978-3-642-23508-5_16

Evaluation of two radiochromic films for HVL measurement. / Gotanda, T.; Katsuda, T.; Gotanda, R.; Tabuchi, A.; Yamamoto, K.; Kuwano, T.; Yatake, H.; Kashiyama, K.; Yabunaka, K.; Akagawa, T.; Takeda, Yoshihiro.

IFMBE Proceedings. Vol. 37 2011. p. 53-56.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Gotanda, T, Katsuda, T, Gotanda, R, Tabuchi, A, Yamamoto, K, Kuwano, T, Yatake, H, Kashiyama, K, Yabunaka, K, Akagawa, T & Takeda, Y 2011, Evaluation of two radiochromic films for HVL measurement. in IFMBE Proceedings. vol. 37, pp. 53-56. https://doi.org/10.1007/978-3-642-23508-5_16
Gotanda T, Katsuda T, Gotanda R, Tabuchi A, Yamamoto K, Kuwano T et al. Evaluation of two radiochromic films for HVL measurement. In IFMBE Proceedings. Vol. 37. 2011. p. 53-56 https://doi.org/10.1007/978-3-642-23508-5_16
Gotanda, T. ; Katsuda, T. ; Gotanda, R. ; Tabuchi, A. ; Yamamoto, K. ; Kuwano, T. ; Yatake, H. ; Kashiyama, K. ; Yabunaka, K. ; Akagawa, T. ; Takeda, Yoshihiro. / Evaluation of two radiochromic films for HVL measurement. IFMBE Proceedings. Vol. 37 2011. pp. 53-56
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