Figure 4
From: Testing the portal imager GLAaS algorithm for machine quality assurance
Examples of various verification (Gamma Evaluation matrices (DTA = 3 mm, ΔD = 3%) and profiles) for open square, rectangular and asymmetric fields. Profiles are shown in the x and y directions: first row: 10 × 10 and 20 × 20 cm2 fields; second row: asymmetric (half beam) fields of 10 × 20 and 20 × 10 cm2. Data are reported for Eclipse calculations (blue dashed), GLAaS (red line), and ion chamber (black dots). Depth of measure or calculation was dmax for a beam energy of 6MV.