Comparison of Hybrid Techniques with 3D-Conformal Radiotherapy in Patients with Lung Cancer

Authors : Ömer AZAKLIOĞLU, Doğukan AKÇAY, İlhami ER, Kadir AKGÜNGÖR, Ayşe Nur DEMİRAL

Pages : 50-57

Doi:10.30621/jbachs.1168222

View : 30 | Download : 27

Publication Date : 2023-09-30

Article Type : Research Paper

Abstract :Purpose: It’s postulated that hybrid techniques insert ignore into journalissuearticles values(HT); with lower weighting of IMRT/VMAT component would improve lung dose-volume parameters despite some disadvantage in PTV homogeneity index insert ignore into journalissuearticles values(HI); and target coverage insert ignore into journalissuearticles values(TC);. Material and Methods: Conformal plans were prepared using 6-10-15 MV-X photon energies while IMRT/VMAT plans of HTs were prepared using 6MV-X. Four HTs were developed having two different ratios insert ignore into journalissuearticles values(10% and 50%); of IMRT/VMAT component insert ignore into journalissuearticles values(h-IMRT1, h-IMRT2 and h-VMAT1, h-VMAT2, respectively);. HTs were compared with 3D-CRT in terms of HI and TC for PTV, and total lung insert ignore into journalissuearticles values(TL); and contralateral lung insert ignore into journalissuearticles values(CL); V5Gy, V10Gy, V20Gy and mean lung dose insert ignore into journalissuearticles values(MLD);. Results: All HTs were advantageous for HI and TC, while disadvantageous for TL and CL-V5Gy. H-IMRT2 provided better TC than h-IMRT1, and so did h-VMAT2 compared to h-VMAT1. Lower weighting of IMRT/VMAT decreased TL and CL-V5Gy in HTs. In addition, h-IMRT1 decreased TL and CL-MLD and CL-V20Gy compared to h-IMRT2, while h-VMAT2 decreased TL-V20Gy and CL-MLD compared to h-VMAT2. Conclusion: In the RT of lung tumors close to vertebra, it may be appropriate to suggest a ratio of IMRT/VMAT component about 10% in order to decrease the low and intermediate dose-wash lung volume, if HI and TC values are acceptable.
Keywords : lung cancer, radiotherapy, treatment planning, hybrid technique, volumetric modulated arc therapy, intensity modulated radiation therapy