TY - GEN
T1 - UV intensity of pre-irradiation in gafchromic XR-RV3 and XR-SP2
AU - Kuwano, Tadao
AU - Takeda, Y.
AU - Katsuda, T.
AU - Gotanda, R.
AU - Gotanda, T.
AU - Akagawa, T.
AU - Tanki, N.
AU - Noguchi, A.
AU - Kawaji, Y.
AU - Yamamoto, K.
AU - Yabunaka, K.
N1 - Publisher Copyright:
© Springer Nature Singapore Pte Ltd. 2018.
PY - 2017
Y1 - 2017
N2 - UV-A irradiation of Gafchromic XR-RV3 and XR-SP2 are considered to be a substitute for X-ray irradiation in the double irradiation of Gafchromic XR-RV3 and XR-SP2. It makes it possible to compensate for heterogeneity errors in the active layers of Gafchromic XR-RV3 and XR-SP2. UV-A with a wavelength of 395-nm was irradiated to Gafchromic XR-RV3 and XR-SP2, and irradiation time and color density change were investigated. At first, Gafchromic XR-RV3 and XR-SP2 were pre-irradiated for 2 and 4 hours, respectively, by UV-A with a wavelength of 365-nm, with UV-A fluorescent lamp as the radiation source, located at a distance of 72 cm. Secondly, a UV-A light emitting diode (LED) capable of generating 395-nm UV-A was used. The irradiation times of UV-A for Gafchromic XR-RV3 and XR-SP2 were from 5 to 120 minutes and from 30 to 300 minutes at a distance of 5.0 cm, respectively. From these results, appropriate irradiation time was considered. A 0.5 inchs diameter region of interest was set for each irradiation area, and a histogram of pixel values was obtained. The selected condition was two items "There is not 0 in a mode", "A 1/10 level intersects both sleeves of graph". When Gafchromic XR-RV3 and XR-SP2 were irradiated with ultraviolet rays of wavelength 395 nm as an X-ray substitute for double irradiation technology, it was proved that 60 minutes (5511.00 mJ/cm2) and 270 minutes (24799.50 mJ/ cm2) were sufficient for irradiation time respectively. And both distance was 5cm.
AB - UV-A irradiation of Gafchromic XR-RV3 and XR-SP2 are considered to be a substitute for X-ray irradiation in the double irradiation of Gafchromic XR-RV3 and XR-SP2. It makes it possible to compensate for heterogeneity errors in the active layers of Gafchromic XR-RV3 and XR-SP2. UV-A with a wavelength of 395-nm was irradiated to Gafchromic XR-RV3 and XR-SP2, and irradiation time and color density change were investigated. At first, Gafchromic XR-RV3 and XR-SP2 were pre-irradiated for 2 and 4 hours, respectively, by UV-A with a wavelength of 365-nm, with UV-A fluorescent lamp as the radiation source, located at a distance of 72 cm. Secondly, a UV-A light emitting diode (LED) capable of generating 395-nm UV-A was used. The irradiation times of UV-A for Gafchromic XR-RV3 and XR-SP2 were from 5 to 120 minutes and from 30 to 300 minutes at a distance of 5.0 cm, respectively. From these results, appropriate irradiation time was considered. A 0.5 inchs diameter region of interest was set for each irradiation area, and a histogram of pixel values was obtained. The selected condition was two items "There is not 0 in a mode", "A 1/10 level intersects both sleeves of graph". When Gafchromic XR-RV3 and XR-SP2 were irradiated with ultraviolet rays of wavelength 395 nm as an X-ray substitute for double irradiation technology, it was proved that 60 minutes (5511.00 mJ/cm2) and 270 minutes (24799.50 mJ/ cm2) were sufficient for irradiation time respectively. And both distance was 5cm.
KW - Computed tomography
KW - Gafchromic film
KW - Nonuniformity
KW - Radiation measurement
KW - Ultraviolet rays
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U2 - 10.1007/978-981-10-5122-7_14
DO - 10.1007/978-981-10-5122-7_14
M3 - Conference contribution
AN - SCOPUS:85021774028
SN - 9789811051210
T3 - IFMBE Proceedings
SP - 53
EP - 56
BT - EMBEC and NBC 2017 - Joint Conference of the European Medical and Biological Engineering Conference EMBEC 2017 and the Nordic-Baltic Conference on Biomedical Engineering and Medical Physics, NBC 2017
A2 - Eskola, Hannu
A2 - Vaisanen, Outi
A2 - Viik, Jari
A2 - Hyttinen, Jari
PB - Springer Verlag
T2 - Joint Conference of the European Medical and Biological Engineering Conference, EMBEC 2017 and Nordic-Baltic Conference on Biomedical Engineering and Medical Physics, NBC 2107
Y2 - 11 June 2017 through 15 June 2017
ER -