All plans were submitted electronically in DICOM RT or RTOG format for review using the Focal treatment planning system (Elekta AB, Stockholm, Sweden).19 ,20 Data export included dose–volume histograms (DVHs) for all target and OAR volumes; however, the DVHs were recalculated using the Focal treatment planning system to ensure consistency in volume calculation methods.21 (link) The quality assurance team reviewed each plan and recorded the actual calculated dose for the target volumes and OAR for each of the specified dose constraint and planning objective levels.
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