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Figure 2: Represent panel A: Patient isocenter plane from treatment planning system (FTPS); panel B: Open-field portal having dimension that of widest jaw position of the intensity-modulated radiation therapy field indicating the heterogeneity correction (Fhet). Panel C: measured fluence from portal imager (FEPID). Panel D: 3%-3 mm gamma-matching considering heterogeneity correction (Fhet). Panel E: 3%-3 mm gamma-matching without considering heterogeneity correction (Fhet)

Figure 2: Represent panel A: Patient isocenter plane from treatment planning system (F<sub>TPS</sub>); panel B: Open-field portal having dimension that of widest jaw position of the intensity-modulated radiation therapy field indicating the heterogeneity correction (F<sub>het</sub>). Panel C: measured fluence from portal imager (F<sub>EPID</sub>). Panel D: 3%-3 mm gamma-matching considering heterogeneity correction (F<sub>het</sub>). Panel E: 3%-3 mm gamma-matching without considering heterogeneity correction (F<sub>het</sub>)