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, Yoshihiro 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 publicationIFMBE Proceedings
Pages780-783
Number of pages4
Volume22
DOIs
Publication statusPublished - 2008
Event4th European Conference of the International Federation for Medical and Biological Engineering, ECIFMBE 2008 - Antwerp, Belgium
Duration: Nov 23 2008Nov 27 2008

Other

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

Fingerprint

Ionization chambers
Quality assurance
Quality control
Calibration
X rays
Dosimetry
Monitoring

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. (2008). Measurement of half-value layer for QA and QC: Simple method using radiochromic film density. In IFMBE Proceedings (Vol. 22, pp. 780-783) https://doi.org/10.1007/978-3-540-89208-3_187

Measurement of half-value layer for QA and QC : Simple method using radiochromic film density. / Gotanda, Tatsuhiro; Katsuda, T.; Gotanda, R.; Tabuchi, A.; Yamamoto, K.; Kuwano, T.; Yatake, H.; Takeda, Yoshihiro.

IFMBE Proceedings. Vol. 22 2008. p. 780-783.

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

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 IFMBE Proceedings. vol. 22, pp. 780-783, 4th European Conference of the International Federation for Medical and Biological Engineering, ECIFMBE 2008, Antwerp, Belgium, 11/23/08. https://doi.org/10.1007/978-3-540-89208-3_187
Gotanda T, Katsuda T, Gotanda R, Tabuchi A, Yamamoto K, Kuwano T et al. Measurement of half-value layer for QA and QC: Simple method using radiochromic film density. In IFMBE Proceedings. Vol. 22. 2008. p. 780-783 https://doi.org/10.1007/978-3-540-89208-3_187
Gotanda, Tatsuhiro ; Katsuda, T. ; Gotanda, R. ; Tabuchi, A. ; Yamamoto, K. ; Kuwano, T. ; Yatake, H. ; Takeda, Yoshihiro. / Measurement of half-value layer for QA and QC : Simple method using radiochromic film density. IFMBE Proceedings. Vol. 22 2008. pp. 780-783
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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.",
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