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- W2152433122 abstract "X-ray detectors based on single crystal diamond film made via chemical vapor deposition were investigated to evaluate their performance under clinically relevant conditions for radiotherapy dosimetry. Studies focused on repeatability, dose rate dependence, tissue phantom ratios, output factors and beam profiling. Repeatability experiments revealed a temporary loss in sensitivity due to charge detrapping effects following irradiation, which was modeled to make corrections that improved short-term precision. Dose rate dependence was observed (Fowler fitting parameter Δ = 0.96 ± 0.2) using dose rates up to ~2 Gy min(-1). The detector statistically distinguished (n = 5, P < 0.05) between dose values separated by 7.7 × 10(-3) Gy (1 MU). Depth dose measurements from 1 to 15 cm and output factors using 3 × 3 to 10 × 10 cm2 field sizes compared well with a Farmer ion chamber (<1.3% difference). Output factor measurements indicate encouraging results for fields sizes <4 × 4 cm2. Off-axis measurements showed that perturbation of the beam could be reduced when the detector is used in the edge-on orientation due to its thin-film sandwich configuration and ~200 nm thick Ag contacts. This relatively inexpensive detector has potential to be used for routine dosimetry using conventional radiotherapy instrumentation." @default.
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- W2152433122 date "2012-04-01" @default.
- W2152433122 modified "2023-10-06" @default.
- W2152433122 title "Clinical investigations of a CVD diamond detector for radiotherapy dosimetry" @default.
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- W2152433122 doi "https://doi.org/10.1016/j.ejmp.2011.04.003" @default.
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