Fig. 3

Residual plots between the actual results and the predicted results of DVH principal component analysis of OARs. In the IMRT model, the rectum, bladder, left femoral head, and right femoral head are, respectively, (a) through (d), and in the VMAT model group, they are, respectively, (e) through (h). The first primary component score (PCS1) of the predicted DVH for each plan’s structure is represented by the horizontal coordinate, and the PCS1 of the corresponding actual DVH of the structures is represented by the vertical coordinate. The figure’s dashed line denotes the error range, while the solid line shows that the predicted and actual numbers are equivalent