Motion compensation with a scanned ion beam: a technical feasibility study

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...

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Detalles Bibliográficos
Autores principales: Grözinger, Sven Oliver, Bert, Christoph, Haberer, Thomas, Kraft, Gerhard, Rietzel, Eike
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2008
Materias:
Research
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2576303/
https://www.ncbi.nlm.nih.gov/pubmed/18854012
http://dx.doi.org/10.1186/1748-717X-3-34
Descripción
Sumario: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.

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