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2018 | Vol. 24, Iss. 4 | 189--193
Tytuł artykułu

Ultraviolet ray irradiation duration for the pre-exposure of Gafchromic EBT2

Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The strength and density change of the ultraviolet (UV) ray of Gafchromic EBT2 were investigated. Previous studies suggested that UV-A rays can be substituted for the x-ray double-exposure technique to correct Gafchromic EBT2’s non-uniformity error. In this study, we aimed to determine the appropriate strength of UV-A rays for irradiating an active layer that would correct the non-uniformity error of Gafchromic EBT2. UV-A rays with a wavelength of 375 nm were used to irradiate Gafchromic EBT2 in various durations, and the resulting density change was investigated. To correct Gafchromic EBT2’s non-uniformity error, a pre-irradiation with a UV-A lamp was conducted at a distance of 72 cm for 30 min. To determine the most appropriate irradiation duration, a UV light-emitting diode generating UV-A of 375 nm was used to irradiate the Gafchromic EBT2 film with varying durations of 1, 2, 3, 4, 5, 10, 15, 20, 25, and 30 min at a distance of 5.3 cm. A 12.7 diameter region of interest was set by the irradiation area, and a histogram of pixel values was created. The condition options were decided based on two important requirements: 1) no zero values of the mode and seconds exist, and 2) the 1/10 value of the mode intersects both histogram sleeves. In the case of Gafchromic EBT2, the irradiation strength was 85.43 mJ/cm2 for one minute in which the pixel value of mean ± SD was 255.34 ± 213.29. The irradiation duration of 4 min was the border duration of the above two conditions. When a UV ray of 375 nm wavelength is used to irradiate Gafchromic EBT2 as a substitute for x-ray exposure, the 4-min pre-irradiation duration (341.74 mJ/cm2) is demonstrably sufficient.
Wydawca

Rocznik
Strony
189--193
Opis fizyczny
Bibliogr. 14 poz., rys., tab.
Twórcy
autor
  • Faculty of Health Sciences, Butsuryo College of Osaka, 3-33, Otorikita-machi Nishi-ku, Sakai-city, Osaka, 593-8328, Japan, tkatsudajp@yahoo.co.jp
autor
  • Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Okayama, Japan
autor
  • Department of Radiological Technology, Tokushima Red Cross Hospital, 103, Irinokuchi, Komatsujshima, Tokushima, 773-8502, Japan
autor
  • Faculty of Health Sciences, Butsuryo College of Osaka, 3-33, Otorikita-machi Nishi-ku, Sakai-city, Osaka, 593-8328, Japan
autor
  • Graduate School of Health Sciences, Okayama University, 2-5-1, Shikata-cyo, Kita-ku, Okayama-city, Okayama, 700-8558, Japan
autor
  • Faculty of Health Sciences, Butsuryo College of Osaka, 3-33, Otorikita-machi Nishi-ku, Sakai-city, Osaka, 593-8328, Japan
autor
  • Graduate School of Medicine, the University of Tokyo, 7-3-1 Hongo, Bunkyou-Ku, Tokyo, 113-0033, Japan
Bibliografia
  • [1] Gotanda T, Katsuda T, Gotanda R, et al. Evaluation of effective energy for QA and QC: measurement of half-value layer using radiochromic film density. Australas Phys Eng Sci Med. 2009;32(1):26-29.
  • [2] Gotanda T, Katsuda T, Gotanda R, et al. Half-Value Layer Measurement: Simple Process Method Using Radiochromic Film. Australas Phys Eng Sci Med. 2009;32(3):150-158.
  • [3] Gotanda T, Katsuda T, Gotanda R, et al. Evaluation of effective energy using radiochromic film and a step-shaped aluminum filter. Australas Phys Eng Sci Med. 2011;34(2):213-222.
  • [4] Gotanda R, Katsuda T, Gotanda T, et al. Computed tomography phantom for radiochromic film dosimetry. Australas Phys Eng Sci Med. 2007;30(3):194-199.
  • [5] Gotanda R, Katsuda T, Gotanda T, et al. Dose distribution in pediatric CT head examination using a new phantom with radiochromic film. Australa Phys Eng Sci Med. 2008;31(4):339-344.
  • [6] Katsuda, T; Gotanda, R. Dose Measuring Method And Phantom, And X-Ray Image Picking-Up Device Used For The Dose Measuring Method, WIPO Patent Application WO/2008/087952.
  • [7] David F. Lewis. A Guide to Radiochromic Film Dosimetry with EBT2 and EBT3. Advanced Materials Group Ashland Specialty Ingredients, Spain, April 2014.
  • [8] Zhu Y, Kirov AS, Mishra V, et al. Quantitative evaluation of radiochromic film response for two-dimensional dosimetry. Med Phys. 1997;24(2):223-231.
  • [9] Katsuda T, Gotanda R, Gotanda T, et al. Reducing Non-uniformity Error of Radiochromic Film in the Diagnostic Range by Ultraviolet Exposure: Preliminary Study. IFMBE Proceedings. 2009;25(3):227-230.
  • [10] Katsuda T, Gotanda R, Gotanda T, et al. Correction of nonuniformity error of Gafchromic EBT2 and EBT3. J Appl Clin Med Phys. 2016;17(3):41-51.
  • [11] Katsuda T, Gotanda R, Gotanda T, et al. Comparing three UV wavelengths for pre-exposing Gafchromic EBT-2 and EBT-3 films. J Appl Clin Med Phys. 2015;16(5):427-434.
  • [12] Katsuda T, Gotanda R, Gotanda T, et al. Determining optimum wavelength of ultraviolet rays to pre-exposure of non-uniformity error correction in Gafchromic EBT2 films. Pol J Med Phys Eng. 2018; 24(1):11-14.
  • [13] de Gruijl FR. Skin cancer and solar UV radiation. Eur J Cancer. 1999; 35(14): 2003-2009.
  • [14] NEC, Data of FL10BL-B: NEC Lighting, Ltd. (in Japanese). http://www.nelt.co.jp/products/_1833.html?p_encd=06111495. Accessed December, 19, 2018.
Typ dokumentu
Bibliografia
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Identyfikator YADDA
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