J Med Phys Close
 

Table 2: Format for recording the values for constancy verification of separation between inflexion points, degree of unflatness, symmetry and radiation beam penumbra (IPL and IPR are the locations of left and right inflection points on the beam profile, respectively; X90%, X75%, and X60% are lateral widths at 90%, 75%, and 60% dose levels, respectively). These parameters should be evaluated for 20 cm ×20 cm collimator setting

Table 2: Format for recording the values for constancy verification of separation between inflexion points, degree of unflatness, symmetry and radiation beam penumbra (IPL and IPR are the locations of left and right inflection points on the beam profile, respectively; X90%, X75%, and X60% are lateral widths at 90%, 75%, and 60% dose levels, respectively). These parameters should be evaluated for 20 cm ×20 cm collimator setting