Warianty tytułu
Języki publikacji
Abstrakty
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.
Rocznik
Tom
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
Identyfikatory
Identyfikator YADDA
bwmeta1.element.baztech-91613cd7-5706-4be5-a8c2-a0429c6becb7