Ultraviolet ray irradiation duration for the pre-exposure of Gafchromic EBT2
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 appropria...
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| Veröffentlicht in: | Polish journal of medical physics and engineering 2018-12, Vol.24 (2), p.189-193 |
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| container_title | Polish journal of medical physics and engineering |
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| creator | Katsuda, Toshizo Gotanda, Rumi Gotanda, Tatsuhiro Akagawa, Takuya Tanki, Nobuyoshi Kuwano, Tadao Noguchi, Atsushi Yabunaka, Kouichi |
| description | 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/cm
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/cm
) is demonstrably sufficient. |
| doi_str_mv | 10.2478/pjmpe-2018-0026 |
| format | Article |
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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/cm
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/cm
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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/cm
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/cm
) is demonstrably sufficient.</description><subject>computed tomography</subject><subject>Density</subject><subject>Error analysis</subject><subject>Error correction</subject><subject>Exposure</subject><subject>Gafchromic film</subject><subject>Histograms</subject><subject>Irradiation</subject><subject>Light emitting diodes</subject><subject>non-uniformity</subject><subject>Nonuniformity</subject><subject>Pixels</subject><subject>radiation measurement</subject><subject>Sleeves</subject><subject>Substitutes</subject><subject>Ultraviolet radiation</subject><subject>ultraviolet rays</subject><issn>1898-0309</issn><issn>1425-4689</issn><issn>1898-0309</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNqlkDFPwzAQRi0EEqUws1piDvU5bmIPDFCVglSJpZ0tJ7FpqrQOlwTov69DkGBhYrrvpHvfSY-Qa2C3XKRyUm93tY04AxkxxpMTMgKpQo6ZOv2Vz8lF02wZS5IY1Igs11WL5r30lW0pmgMtEU1Rmrb0e1p0OATnkbYbS2u0kf2sfdOhpd7RhXH5Bv2uzOn8YcUvyZkzVWOvvueYrB_nq9lTtHxZPM_ul1EupGijjEuQibMMhJI5xIqpLDNTDq6IuZOiyFih8hhM2AAywSy42AihhHEiNMRjcjP01ujfOtu0eus73IeXmkMK6VSlqr-aDFc5-qZB63SN5c7gQQPTvTL9pUz3ynSvLBB3A_FhqtZiYV-xO4TwU_8HyYUIgv_D854_Alf8h_I</recordid><startdate>20181201</startdate><enddate>20181201</enddate><creator>Katsuda, Toshizo</creator><creator>Gotanda, Rumi</creator><creator>Gotanda, Tatsuhiro</creator><creator>Akagawa, Takuya</creator><creator>Tanki, Nobuyoshi</creator><creator>Kuwano, Tadao</creator><creator>Noguchi, Atsushi</creator><creator>Yabunaka, Kouichi</creator><general>Sciendo</general><general>De Gruyter Poland</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7X7</scope><scope>7XB</scope><scope>8AO</scope><scope>8FE</scope><scope>8FG</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>L6V</scope><scope>M0S</scope><scope>M7S</scope><scope>P5Z</scope><scope>P62</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope></search><sort><creationdate>20181201</creationdate><title>Ultraviolet ray irradiation duration for the pre-exposure of Gafchromic EBT2</title><author>Katsuda, Toshizo ; 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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/cm
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/cm
) is demonstrably sufficient.</abstract><cop>Warsaw</cop><pub>Sciendo</pub><doi>10.2478/pjmpe-2018-0026</doi><tpages>5</tpages><oa>free_for_read</oa></addata></record> |
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| source | Walter De Gruyter: Open Access Journals; EZB-FREE-00999 freely available EZB journals |
| subjects | computed tomography Density Error analysis Error correction Exposure Gafchromic film Histograms Irradiation Light emitting diodes non-uniformity Nonuniformity Pixels radiation measurement Sleeves Substitutes Ultraviolet radiation ultraviolet rays |
| title | Ultraviolet ray irradiation duration for the pre-exposure of Gafchromic EBT2 |
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