Figure 2

Examples among the 39 images needed for MPC evaluation. (a) comb-like pattern for MLC positioning (MV); (b) open beam for beam constancy (MV); (c) and (d) open field with comb-like MLC pattern for treatment isocenter definition, at two collimator angles (MV); (e) and (f) comb-like MLC pattern with IsoCal phantom for treatment isocenter and gantry position, at different gantry angles (MV); (g) and (h) IsoCal phantom with different couch positions (kV).