Development of infrared flat-bed scanner with transparency unit employing light emitting diode for gafchromic EBT film

Hideki Aoyama, Yoshiharu Azuma, Sachiko Goto, Hirofumi Hato, Tetsuhiro Sumimoto

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

1 Citation (Scopus)

Abstract

Purpose: We developed an infrared flat-bed scanner with a transparency unit (IR 4000, iMeasure, Inc.) in order to increase the sensitivity of measuring density of Gafchromic EBT film (International Specialty Products). Then, the performance of IR 4000 was investigated, comparing with a general-purpose flat-bed scanner. Methods and Materials: Gafchromic EBT film (EBT) has the absorption spectrum with a maximum absorption band centered at 636 nm. Consequently the response of EBT will be enhanced by measurement with red light. Then, the transparency unit of IR 4000 for EBT has light emitting diode (LED) with a peak wavelength of 630 nm, and was produced by replacing LEDs of white light in the transparency unit for the flat-bed scanner (ES 2200, Seiko Epson Corp). Samples of EBT were covered with solid water RMI-457 phantoms and were exposed to the following doses: 0.3 – 10.0 Gy with the 6 MV photon beam from a Siemens MEVATRON77 DX67 accelerator. The irradiated samples were scanned by IR 4000 with 48 bit color mode and 1200 dpi and the scan data of red channel was converted into optical density. And also, the samples to which the yellow filter (International Specialty Products) was added were scanned by ES 2200. Furthermore the optical density by the two scanners was divided by the absorbed dose and the value was estimated as sensitivity. Result and Discussion: EBT using IR 4000 was about 1.60 times more sensitive on the average than using ES 2200 with the yellow filter in the dose range from 0.3 Gy to 10.0 Gy. By using IR 4000, the increase of sensitivity for EBT is easily achieved without using the filter which has the problem of dust, scratch or oxidation. Conclusion: The high capability of all Gafchromic films is utilizable by employing IR 4000 which has the easily exchangeable transparency unit.

Original languageEnglish
Title of host publicationIFMBE Proceedings
PublisherSpringer Verlag
Pages2163-2167
Number of pages5
Volume14
Edition1
Publication statusPublished - 2007
Event10th World Congress on Medical Physics and Biomedical Engineering, WC 2006 - Seoul, Korea, Republic of
Duration: Aug 27 2006Sep 1 2006

Other

Other10th World Congress on Medical Physics and Biomedical Engineering, WC 2006
CountryKorea, Republic of
CitySeoul
Period8/27/069/1/06

Keywords

  • Absorption peak
  • Gafchromic EBT film
  • Infrared flat-bed scanner
  • Radiochromic film
  • Sensitivity

ASJC Scopus subject areas

  • Biomedical Engineering
  • Bioengineering

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  • Cite this

    Aoyama, H., Azuma, Y., Goto, S., Hato, H., & Sumimoto, T. (2007). Development of infrared flat-bed scanner with transparency unit employing light emitting diode for gafchromic EBT film. In IFMBE Proceedings (1 ed., Vol. 14, pp. 2163-2167). Springer Verlag.