[P148] Evaluation of delta4 phantom’s spatial sensitivity

Purpose null The aim of this study is to evaluate the spatial sensitivity of the Delta4 diode array phantom (Scandidos, Uppsala, Sweden) investigating how set up errors affect the measurement’s results during head and neck treatment plan verification. null null null Method null The Delta4 phantom is used to verify ten IMRT head and neck plans, created on Oncentra v4.5.2 (Nucletron, Elekta) treatment planning system. Patient plans were...