Figure 2From: Estimation of adequate setup margins and threshold for position errors requiring immediate attention in head and neck cancer radiotherapy based on 2D image guidance3D setup errors for the four subregions. The black bars present the results of the MID_PTV match, while the white bars demonstrate the results of the MIN_MAX match. The errors present daily imaging and include observer variation. Note that 2D errors are given for the occiput bone.Back to article page