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• W3009485715 abstract "Abstract Daily image guidance reduces inter‐fractional variation in patient position for intracranial radiation therapy. However, the ability to detect and correct positioning errors is limited below a certain level. Because of these limitations, the accuracy achieved with a positioning system prior to image guidance may affect the error remaining after image guidance (the residual setup error). The objective of this study was to compare the setup accuracy achieved before and after megavoltage (MV) and cone‐beam computed tomography (CBCT) guidance between two intracranial positioning systems. Equipment included a four degrees‐of‐freedom couch capable of 1 mm translational moves. Six dog cadavers were positioned 24 times as for clinical treatment in a head re‐positioner (HPS), and the coordinates of five fiducial markers were measured before and after image‐guided correction. The values obtained for the HPS were compared with those previously reported for the standard positioning system (SPS) used at this facility. The mean three‐dimensional distance vector (3DDV) was lower for the HPS than for the SPS when no image guidance was used ( P = .019). The mean 3DDV after MV guidance was lower for the HPS than for the SPS ( P = .027), but not different after CBCT guidance ( P = .231). The 95th percentiles of the 3DDV after MV and CBCT guidance were 2.1 and 2.9 mm, respectively, for the HPS, and 2.8 and 3.6 mm for the SPS. The setup error after MV guidance was lower for the positioning system that achieved a more accurate patient position before image guidance." @default.
• W3009485715 created "2020-03-13" @default.
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• W3009485715 date "2020-03-14" @default.
• W3009485715 modified "2023-10-14" @default.
• W3009485715 title "Setup error with and without image guidance using two canine intracranial positioning systems for radiation therapy" @default.
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• W3009485715 doi "https://doi.org/10.1111/vco.12584" @default.
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