Figure 3From: The impact of flattening-filter-free beam technology on 3D conformal RTDiagram correlating PTV volume with the field number coefficient. Correlation between the mean values for the location-specific coefficient FieldsFFF/FieldsFF and the volume of PTV. The quality of the linear fit is given with R2. The data point spine metastasis was excluded due to inconsistent FF planning with virtual wedge fields.Back to article page