Fig. 3.

Mean systematic errors are displayed for both setup modalities (tattoo/laser and SGRT). Mean is representative of the mean of all the individual patient mean errors in the 3 translational directions (VERT- vertical, LNG- longitudinal, LAT-lateral). A reduction in the mean systematic errors in the vertical, longitudinal, and lateral directions are seen when SGRT is utilised (indicated by the striped bars). The treatment sites include whole breast, partial breast irradiation, and proton beam chest wall irradiation. Significant improvements are noted in the lateral direction for Cravo et al and all 3 directions for Batin et al.