Feasibility of hybrid TomoHelical- and TomoDirect-based volumetric gradient matching technique for total body irradiation

摘要

Volumetric gradient matching technique plan example for TH&TD-5GVs and TH&TD-7GVs. Definition of upper and lower-PTV in head-first and feet-first position and gradient volumes (GVs). Dose distribution from each Tomotherapy plan: TomoHelical IMRT plan in Head-first position, TomoDirect IMRT plan in feet-first position, and sagittal view of summed dose distribution from upper and lower-PTV plans. White dashed line (along the line A-B) indicates location for drawing the dose profile. The phantom center (PTV center) was aligned to coincide with the gantry isocenter (point F on ( )). The positions of three dose measurement points are the E, F, and G