Akademik Veri Yönetim Sistemi
Cancer radiotherapie : journal de la Societe francaise de radiotherapie oncologique, cilt.27, sa.8, ss.698-704, 2023 (SCI-Expanded)
Purpose: The aim of this study is to use respiratory motion-managed radiotherapy (RT) to reduce side effects and to compare dosimetric factors with free-breathing planning in patients with lung cancer. Materials and methods: Simulation images were obtained in 10 respiratory phases with free breathing using four-dimensional computed tomography (4D-CT) scanner. Planning target volume (PTV) was created with 5 mm margins in each direction of the internal target volume delineated using the maximum intensity projection. A volumetric arc treatment (VMAT) plan was created so that the prescribed dose would cover 98% of the PTV. Target volumes for the free-breathing VMAT plan were created according to ICRU Reports 62 and the same prescribed dose was used. Results: Patients were evaluated during January 2020. Median 63 Gy (59.4–64) RT was administered. Median PTV volumes were 173.53 and 494.50 cm3 (P = 0.008) and dose covering 95% of PTV volume was 62.97 and 60.51 Gy (P = 0.13) in 4D-CT based and free-breathing VMAT plans, respectively. The mean and V50 heart dose was 6.03 Gy (vs. 10.36 Gy, P = 0.043) and 8.2% (vs. 33.9%, P = 0.007), and significantly lower in 4D-CT based VMAT plans and there was also found a non-significant reduction for other risky organ doses. Conclusion: Ten patients treated with respiratory motion-managed RT with 4D-CT based VMAT technique. It was observed that PTV did not increase, the target was covered with 95% accuracy, and with statistical significance in heart doses, all risky organ doses were found to be less.