Investigation of SBRT and IMRT Techniques in Lung Radiotherapy: A Dosimetric Study

Abstract

Objective: In our study, we aimed to compare the dose distrubutions of Accuray brand TomoTherapy device Volo treatment planning system lung stereoactic body radiation therapy (SBRT) and intensity-adjusted radiation therapy in cancer dose distributions obtained using (IMRT) techniques and environmental doses. Matetial and Method: Computed Tomography (CT) images of 7 patients were transferred to the MIM contouring station for dose measurement. CT target volume via image; PTV right or left lung, critical organs: heart, costa, esophagus, medulla, bilateral lung transferred to planning system. Lung tumors created virtually.In study 1 cm tumor of the size it is formed to be cm,3 cm and 5 cm. Spouse as lungtumor sizes change.in time, the cross-section (jaw) area of the TomoTherapy device will also be 1 cm, 2.5 cm and 5 cm it has been modified and tested for SBRT and IMRT techniques at each tumor size. Results: PTV dose treatment plans have been established to be 60 Gy and 3 fractions. The study 1 cm tumor of the size SBRT and IMRT techniques compared to the treatment of lung cancer as a result for 1 cm jaw, 2.5 cm jaw and 5 cm jaw in cm tumor size and 5 cm tumor PTV max, D95 values for 1 cm jaw used in size and bilateral, which is the critical organs. A significant difference in lung max values was found in favor of SBRT (p<0.05). 3 cm tumor size used in 1 cm, 2.5 cm and 5 cm jaw areas and 5 cm treatment compared to 2.5 and 5 cm jaw areas used in cm tumor bouts statistics on ptv max and bilateral lung max values at the end of the analysis, an agreed difference was found in favor of the SBRT (p<0.05) during treatment periods. At the end of statistical analysis in 1 cm jaw area used in 1 cm tumor size a significant difference in favor of IMRT has been identified.(p<0.05) and no significant differences were found for other critical organs (p > 0.05). Conclusion: As a result, 1 cm, 3 cm and 5 cm tumor sizes used in 1 cm, 2.5 cm and 5 cm section (jaw) areas according to both techniques preserved critical organs. But the SBRT technique showed better results in terms of target volume (PTV) and both lungs.