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Figure 6: Pretreatment quality assurance: validation measurement result using transit dosimetry results for lower esophagus case. Panels A and D are same shows the electronic portal imaging device measured dose in the presence of patient (FEPID_TRANSIT). Panel B measured electronic portal imaging device fluence corrected for exit plane heterogeneity from TPS (Fresultant_EXITPlane= FEPID× Fhet_EXITPlane). Panel C shows the gamma matching for A and B. Panel E is treatment planning system-generated fluence (FEPID) uncorrected for heterogeneity correction from treatment planning system. Panel F: gamma matching between D and E

Figure 6: Pretreatment quality assurance: validation measurement result using transit dosimetry results for lower esophagus case. Panels A and D are same shows the electronic portal imaging device measured dose in the presence of patient (F<sub>EPID_TRANSIT</sub>). Panel B measured electronic portal imaging device fluence corrected for exit plane heterogeneity from TPS (F<sub>resultant_EXIT</sub><sub>Plane</sub>= F<sub>EPID</sub>× F<sub>het_EXIT</sub><sub>Plane</sub>). Panel C shows the gamma matching for A and B. Panel E is treatment planning system-generated fluence (F<sub>EPID</sub>) uncorrected for heterogeneity correction from treatment planning system. Panel F: gamma matching between D and E