Robustness of Beam Tracking for Moving Tumors
نویسندگان
چکیده
Scanned carbon ion radiotherapy beams provide highly conformal dose distributions for stationary tumors and excellent sparing of nearby normal tissues due to the sharp energy-loss maximum (Bragg peak) near the end of the particle range and minimal lateral Coulomb scattering. For moving targets (e.g., respiratory motion) treatment delivery with scanned ion beams becomes considerably more complex, and individual pencil beams may inadvertently overlap a previously-irradiated region (overdose) or entirely miss a desired region in the target (underdose). A beam tracking method developed by Grözinger et al [1] minimizes these effects by adapting the scanned pencil beam position and energy to follow a moving target. The purpose of the current study was to assess the robustness of beam tracking for moving radiotherapy targets to uncertainties and limitations in the therapy tracking system.
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