Figure 4

Receiver operating characteristic curve of various gamma criteria when using MapCHECK2 and EBT2 film. Receiver operating characteristic (ROC) curves of gamma criteria of 1%/1 mm, 1.5%/1.5 mm, 1%/2 mm, 2%/1 mm and 2%/2 mm are shown. The ROC curves of 0.5 mm MLC misalignment at Class Out (a), Class In (c) and 2 mm MLC misalignment at Class Shift (e) when using MapCHECK2 are shown. Similarly, 0.5 mm MLC misalignment at Class Out (b), Class In (d) and 2 mm MLC misalignment at Class Shift (f) when using EBT2 films are shown.