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- W2134562124 abstract "The aim of this study was to assess the set-up uncertainties and the possible CTV-PTV margin reduction when adopting daily IGRT. Further, to identify any intrafraction time trends in the prostate movements to ensure the margin reduction gained from IGRT. Fifteen prostate cancer patients treated with IMRT using daily IG of three implanted fiducial markers were included. The interfraction uncertainties were assessed by statistically evaluating the daily prostate marker displacement. The intrafraction uncertainties were represented by the difference in prostate marker displacement before and after beam delivery. To evaluate any intrafraction time trends, the data points were divided into two groups with respect to time duration and statistically analysed. This study confirmed that daily IG considerably reduces the set-up uncertainties. Our results implied that if IGRT is performed on a daily basis, both systematic and random set-up errors will be reduced to a minimum, leading to a required set-up margin of only 1.5 mm. Results from measurements of intrafraction motions in time durations ranging from 2 to 27 min, indicated that a margin enlargement of 1 mm was required to account for the intrafraction uncertainties. The results did not suggest any significant time trends in the intrafraction uncertainties." @default.
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- W2134562124 date "2006-01-01" @default.
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- W2134562124 title "IGRT of prostate cancer; is the margin reduction gained from daily IG time-dependent?" @default.
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- W2134562124 doi "https://doi.org/10.1080/02841860600907337" @default.
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