Measurement of half-value layer for QA and QC: Simple method using radiochromic film density

Tatsuhiro Gotanda, T. Katsuda, R. Gotanda, A. Tabuchi, K. Yamamoto, T. Kuwano, H. Yatake, Y. Takeda

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

2 Citations (Scopus)

Abstract

Although it is considered that the half-value layer (HVL) of diagnostic X-rays is important for quality assurance (QA) and quality control (QC), the HVL is not constantly monitored because ionization-chamber dosimetry is time-consuming and complicated. To verify the applicability of GAFCHROMIC XR type R (GAF-R) film for HVL measurement instead of monitoring the ionization-chamber, a single-strip method for measuring the HVL has been evaluated. The calibration curves of absorbed dose and film density were generated using this single-strip method with eight strips of GAF-R film. The single-strip method precisely evaluated the increment of the film density. The exposure parameters of the X-ray generator (KXO-50G) were 120 kV, 200 mA and 0.28 s. Absorbed doses ranged from 0 to 12 cGy in increments of 2 cGy. The coefficient of determination of the straight-line approximation was evaluated. The HVL values measured using the GAF-R and ionization-chamber (Radcal-1015 6 cc) methods were compared. The coefficients of determination of the straight-line approximation for eight pieces of GAF-R film ranged from 0.9903 to 0.9961. The HVLs (effective energies) obtained from the GAF-R and ionization-chamber were 5.10 mm (42.18 keV) and 4.45 mm (39.70 keV), respectively. The differences in HVL and effective energy values obtained by the two methods were 14.6% and 6.2%, respectively. The calibration curves of the individual GAF-R strips were similar straight lines. This suggested that GAF-R could be used to measure the HVL from the film-density growth without the need for ionization-chamber measurements.

Original languageEnglish
Title of host publication4th European Conference of the International Federation for Medical and Biological Engineering - ECIFMBE 2008
Pages780-783
Number of pages4
DOIs
Publication statusPublished - Dec 1 2008
Event4th European Conference of the International Federation for Medical and Biological Engineering, ECIFMBE 2008 - Antwerp, Belgium
Duration: Nov 23 2008Nov 27 2008

Publication series

NameIFMBE Proceedings
Volume22
ISSN (Print)1680-0737

Other

Other4th European Conference of the International Federation for Medical and Biological Engineering, ECIFMBE 2008
CountryBelgium
CityAntwerp
Period11/23/0811/27/08

Keywords

  • Effective energy
  • Half-value layer
  • Quality assurance
  • Quality control
  • Radiochromic film

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering

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    Gotanda, T., Katsuda, T., Gotanda, R., Tabuchi, A., Yamamoto, K., Kuwano, T., Yatake, H., & Takeda, Y. (2008). Measurement of half-value layer for QA and QC: Simple method using radiochromic film density. In 4th European Conference of the International Federation for Medical and Biological Engineering - ECIFMBE 2008 (pp. 780-783). (IFMBE Proceedings; Vol. 22). https://doi.org/10.1007/978-3-540-89208-3_187