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

• Autorzy: Mani K. M. , Bhuiyan Md. A. , Alam Md. M. , Ahmed S. , Sumon M. A. , Sengupta A. K. , Rahman Md. S. , Islam Md. S. M. A.

Identyfikatory

DOI

10.2478/pjmpe-2018-0003

• Języki publikacji: EN

Abstrakty

EN

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

Słowa kluczowe

EN

DIBH; free breathing; SBRT; lung radiotherapy; gated SBRT

• Wydawca: Polskie Towarzystwo Fizyki Medycznej ; De Gruyter
• Czasopismo: Polish Journal of Medical Physics and Engineering
• Rocznik: 2018
• Tom: Vol. 24, Iss. 1
• Strony: 15--24
• Opis fizyczny: Bibliogr. 9 poz., rys., tab.

Twórcy

autor

Mani K. M.

• Department of Physics, Jahangirnagar University, Savar, Dhaka - 1342, Bangladesh

autor

Bhuiyan Md. A.

• Department of Radiation Oncology, United Hospital, Gulshan, Dhaka - 1212, Bangladesh

autor

Alam Md. M.

• Department of Medical Physics and Biomedical Engineering, Gono Bishwabidyalay, Savar, Dhaka, Bangladesh

autor

Ahmed S.

• Department of Radiation Oncology, United Hospital, Gulshan, Dhaka - 1212, Bangladesh

autor

Sumon M. A.

• Department of Radiation Oncology, United Hospital, Gulshan, Dhaka - 1212, Bangladesh

autor

Sengupta A. K.

• Department of Radiation Oncology, United Hospital, Gulshan, Dhaka - 1212, Bangladesh

autor

Rahman Md. S.

• Secondary Standard Dosimetry Laboratory, Institute of Nuclear Science and Technology, Bangladesh Atomic Energy

autor

Islam Md. S. M. A.

• Department of Physics, Jahangirnagar University, Savar, Dhaka - 1342, Bangladesh

Bibliografia

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