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KMID : 0357520140370040341
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Journal of Radiological Science and Technology
2014 Volume.37 No. 4 p.341 ~ p.348
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Dose Evaluation at The Build Up Region Using by Wedge Filter
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Kim Yon-Lae
Moon Seong-Kong
Suh Tae-Suk
Chung Jin-Beom
Kim Jin-Young
Lee Jeong-Woo
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Abstract
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Wedge filter could use to increase the dose distribution at the hot dose regions. We evaluated dose discrepancy at surface and build region in the infield and outfield that Metal Wedge (MW) and Enhance Dynamic Wedge (EDW) were interact with photon. In this paper, we used Gafchromic EBT3 film that had excellent spatial resolution, composed the water equivalent materials and changed the optical density without development. The set up conditions of linear accelerator were fixed 6 MV photon, 100 cm SSD, 10×10 cm2 field size and were irradiated 400 cGy at Dmax. The dose distribution and absorbed dose were evaluated when we compared the open field with 15°, 30°, 45° metal wedge and enhanced dynamic wedge. A 15° metal wedge could increase the surface and build up region dose than using a 15° enhanced dynamic wedge. A 30° metal wedge could decrease the surface and build up region dose than using a 30° enhanced dynamic wedge. A 45° metal wedge could decrease by large deviation the surface and build up region dose than using a 15° enhanced dynamic wedge. The dose of penumbra region at outfield were increased on the thick side but were decreased on the thin side. It could be decrease the surface dose and build up region dose, if the metal wedge filters were properly used to make a good dose distribution and not closed the distance of surface.
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KEYWORD
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metal wedge, enhance dynamic wedge, Gafchromic EBT3 film, surface dose, build up region dose
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