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Evaluation of IMRT Treatment of Thorax Esophageal Carcinoma in Elekta and Varian Linac

W Bai,R Zhang,Z Chi*,


(Sunday, 7/14/2019)  

Room: ePoster Forums

Purpose: To evalution the characteristics of static IMRT plans designed on Elekta Synergy2349 and Varian Unique2229 Linac in different esophageal cancer(EC), exploring the characteristic of the two Linac,thus can be better service for clinical.

Methods: The Oncentra4.1 TPS was adopted to design both Varian and Elekta IMRT plans for thirty patients, including 10 cases located in upper,middle and the lower thorax, respectively, who were diagnosed with thoracic EC. The prescription dose to the PTV is 60Gy in 30 fractions. All treatment plans of the 30 cases were evaluated using the DVH parameters of PTV and the organs at risk, and additional MU, treatment time, and Gamma index comparisons were performed.

Results: All plans resulted in abundant dose coverage of PTV for EC of different locations, MUs and gamma index were similar between the two Linac plans. The doses to PTV, HI and OAR in Elekta plans were not statistically different in comparison with Varian plans, with the following exceptions: in upper and lower thoracic EC the PTV's CI,were better in Elekta plans than in Varian plans(P=0.02, 0.05), while in middle thorax EC Varian plans PTV's D2, D50, PTV-average were better than Elekta plans. Treatment time were significantly decreased in Varian plans as against Elekta plans in the cervical and the middle thorax EC by 14.7% and 20.8%, respectivly, while in the lower thoracic EC treatment time were no striking difference.

Conclusion: For the the middle thorax EC Varian plans is better than Elekta plans, not only in treatment time but also in the PTV dose; while for the lower thorax EC Elekta plans is the first choice for better CI; for the upper EC usually Elekta plans can increase the CI, while Varian plans can reduce treatment time, can be selected according to the actual situation of the patient treatment.


Not Applicable / None Entered.


TH- External beam- photons: treatment planning/virtual clinical studies

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