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- W2419366161 abstract "Aims and Background The importance of optimal daily patient positioning has been stressed in order to ensure treatment reproducibility and gain in accuracy and precision. We report our data on the 3D setup uncertainty during radiation therapy for prostate cancer using the CT image fusion technique. Methods Ten consecutive patients scheduled for radiation therapy for prostate cancer underwent 5 prone position CT scans using an individualized immobilization cast. These different setups were analyzed using the image fusion module of the ERGO 3D-Line Medical System (Milan, Italy) treatment planning system. The isocenter and the body marker displacements were measured. Results The 3D isocenter dislocations were quantified: systematic error was Σ 3D = 3.9 mm, whereas random error was σ 3D = 1 mm. The mean of the minimum displacements was 0.2 ± 1 mm showing that the immobilization device used allows an accurate setup to be obtained. Single direction errors were also measured showing systematic errors, Σ AP = 2.6 mm, Σ LL = 0.6 mm, Σ SI = 3 mm in the anterior-posterior, latero-lateral, superior-inferior direction, respectively. Related random errors were σ AP = 1 mm, σ LL = 0.6 mm, σ SI = 1.2 mm. In terms of accuracy, our uncertainties are similar to those reported in the literature. Conclusions By applying the CT image fusion technique, a 3D study on setup accuracy was performed. We demonstrated that the use of an individualized immobilization system for prostate treatment is adequate to obtain good setup accuracy, as long as a high-quality positioning control method, such as the stereoscopic X-ray-based positioning system, is used." @default.
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- W2419366161 date "2006-03-01" @default.
- W2419366161 modified "2023-10-18" @default.
- W2419366161 title "Ct Image Fusion as a Tool for Measuring in 3D the Setup Errors during Conformal Radiotherapy for Prostate Cancer" @default.
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- W2419366161 doi "https://doi.org/10.1177/030089160609200206" @default.
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