Figure 1.

Analyses of the transverse profiles of the MVCT detector during the step‐wedge QA procedure: (A) profiles over all MVCT detector channels measured for the five separate steps, given in arbitrary units (a.u.), and used for center of field determination; (B) MVCT detector profiles (panel A) normalized to the profile measured in air, used to measure the position of the sagittal laser; (C) location of the center with three different methods; (D) percentage depth dose (PDD) derived from the six levels of the non‐normalized MVCT profiles (‘step wedge PDD 1’), and derived from the normalized MVCT profiles (‘stepwedge PDD 2’), normalized to the dose value at 5 cm water depth.