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- W2145503485 abstract "We investigated patient positioning during radiosurgery of cranial lesions, and calculated clinical target volume (CTV) to planning target volume (PTV) margins using a modified common margin recipe. We simulated CTV-to-PTV margins for reduced image guidance, and repositioning for the first table angle only.Patients were immobilized with a thermoplastic mask. Positioning was verified and corrected using the ExacTrac/Novalis Body. Each patient was repositioned before each beam. A common margin recipe was adapted for estimation of CTV-to-PTV margins. Necessary margins were estimated to correct positioning for the initial table angle only in comparison.In total, 269 radiosurgery treatments with 967 different-angle setups (mean 3.6 different angles) were performed on 190 patients. Residual translational errors were (one standard deviation) 0.3 mm in left-right (LR), superior-inferior (SI), and anterior-posterior (AP) directions, with a mean three-dimensional vector of 0.5 mm. Margins for residual errors after correction were calculated in LR, SI, and AP directions as 0.8 mm. For simulated reduced frequency setup correction, we calculated CTV-to-PTV margins as 1.9, 1.9, and 1.6 mm, respectively.The ExacTrac/Novalis Body system allows for accurate positioning of the patient with a residual error comparable to invasive mask fixation. If verification is only performed after initial positioning, adaption of CTV-to-PTV margins should be considered." @default.
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- W2145503485 date "2013-10-01" @default.
- W2145503485 modified "2023-10-03" @default.
- W2145503485 title "Image-guided stereotactic radiosurgery for cranial lesions: large margins compensate for reduced image guidance frequency." @default.
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