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- W1992642392 abstract "Despite much development, there remains dosimetric uncertainty in the surface and build‐up regions in intensity‐modulated radiation therapy treatment plans for head and neck cancers. Experiments were performed to determine the dosimetric discrepancies in the surface and build‐up region between the treatment planning system (TPS) prediction and experimental measurement using radiochromic film. A head and neck compression film phantom was constructed from two semicylindrical solid water slabs. Treatment plans were generated using two commercial TPSs ( PINNACLE 3 and CORVUS ) for two cases, one with a shallow ( depth) target and another with a deep ( depth) target. The plans were evaluated for a 54 Gy prescribed dose. For each case, two pieces of radiochromic film were used for dose measurement. A small piece of film strip was placed on the surface and another was inserted within the phantom. Overall, both TPSs showed good agreement with the measurement. For the shallow target case, the dose differences were within (5.6% with respect to the prescribed dose) for PINNACLE 3 and (4.4%) for CORVUS in 90% of the region of interest. For the deep target case, the dose differences were (6.5%) for PINNACLE 3 and (4.8%) for CORVUS in 90% of the region of interest. However, it was found that there were significant discrepancies from the surface to about 0.2 cm in depth for both the shallow and deep target cases. It was concluded that both TPSs overestimated the surface dose for both shallow and deep target cases. The amount of overestimation ranges from 400 to 1000 cGy ( to 18.5% with respect to the prescribed dose, 5400 cGy)." @default.
- W1992642392 created "2016-06-24" @default.
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- W1992642392 date "2005-07-29" @default.
- W1992642392 modified "2023-10-07" @default.
- W1992642392 title "Evaluation of surface and build‐up region dose for intensity‐modulated radiation therapy in head and neck cancer" @default.
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- W1992642392 doi "https://doi.org/10.1118/1.1992067" @default.
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