Dosimetric comparison of deep inspiration breath hold and free breathing technique in stereotactic body radiotherapy for localized lung tumor using Flattening Filter Free beam

• DOI: 10.2478/pjmpe-2018-0003
• Publication Date: 2018-04-05T12:39:09Z
• Authors: Karthick Raj Mani; Md. Anisuzzaman B...; Md. Mahbub Alam; Sharif Ahmed; Mostafa Aziz Sumon; Ashim Kumar Sengupta; Md. Shakilur Rahman; Md. S. M. Azharul...
• Keywords: Lung tumor

Abstract Aim: To compare the dosimetric advantage of stereotactic body radiotherapy (SBRT) for localized lung tumor between deep inspiration breath hold technique and free breathing technique. Materials methods: We retrospectively included ten previously treated patients in this study. All underwent CT simulation using 4D-CT (FB) (DIBH) techniques. Plans were created three coplanar full modulated arc 6 MV flattening filter (FFF) bream with a dose rate 1400 MU/min. Same constraints target critical structures particular patient used during plan optimization process DIBH FB datasets. intend to deliver 50 Gy 5 fractions all patients. For standardization, plans normalized at mean planning volume (PTV). Doses targets recorded from histogram evaluation. Results: The right left volumes inflated by 1.55 1.60 times scans compared scans. internal (ITV) increased datasets 1.45 data sets. followed standard deviation (x̄ ± σx̄) ipsilateral DIBH-SBRT FB-SBRT 7.48 3.57 (Gy) 10.23 4.58 respectively, reduction 36.84% plans. Ipsilateral reduced Conclusion: Significant due inflation motion restriction observed FB-SBRT. demonstrate superior normal tissues other structures.