Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: " Motion compensation with a scanned ion beam: a technical feasibility study. | Radiation Oncology BioMed Central Research Motion compensation with a scanned ion beam a technical feasibility study Sven Oliver Grozinger Christoph Bert Thomas Haberer Gerhard Kraft and Eike Rietzel Open Access Address Gesellschaft fur Schwerionenforschung GSI Abteilung Biophysik Planckstrafie 1 64291 Darmstadt Germany Email Sven Oliver Grozinger - Christoph Bert - Thomas Haberer - Gerhard Eike Rietzel - eike@ Corresponding author Published 14 October 2008 Received 3 April 2008 Accepted 14 October 2008 RadiationOncology 2008 3 34 doi 1748-717X-3-34 This article is available from http content 3 1 34 2008 Grozinger et al licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background Intrafractional motion results in local over- and under-dosage in particle therapy with a scanned beam. Scanned beam delivery offers the possibility to compensate target motion by tracking with the treatment beam. Methods Lateral motion components were compensated directly with the beam scanning system by adapting nominal beam positions according to the target motion. Longitudinal motion compensation to mitigate motion induced range changes was performed with a dedicated wedge system that adjusts effective particle energies at isocenter. Results Lateral compensation performance was better than 1 for a homogeneous dose distribution when comparing irradiations of a stationary radiographic film and a moving film using motion compensation. The accuracy of longitudinal range compensation was well below 1 mm. Conclusion Motion compensation with scanned particle beams is technically feasible with high precision. Background In
