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2017, Cilt 8, Sayı 3, Sayfa(lar) 146-149
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COMPARISON OF 3D CONFORMAL AND VOLUMETRIC MODULATED ARC TECH ACCORDING TO RTOG 0915 PROTOCOL TREATMENT PLANNING GUIDELINES IN STEREOTACTIC LUNG RADIATION THERAPHY
Burak Başlangıç, Görkem Güngör, Gökhan Aydın, Melih Uluer, Mustafa Karademir, Bülent Yapıcı, Bilgehan Şahin, Banu Atalar, Enis Özyar
Acibadem Üniversitesi Sağlık Bilimleri Estitüsü, Radyasyon Onkolojisi, İstan
Keywords: VMAT, conformal arc, flattening filter, flattenibg filter free energy modes

In this study, 20 non-small cell lung cancer patients were treated according to the accepted physical criteria of the latest lung SBRT protocol RTOG 0915. VMAT, 3D conformal arc techniques with 6 MV FF and FFF energy modalities were used for treatment planning.

VMAT technique has statistical significance and has shown better high dose and intermediate spillage region according to RTOG 0915 definitions; ratio of prescription isodose volume to the PTV volume (Conformity index - CI), ratio of 50% prescription isodose volume to the PTV (intermediate spillage volume - ISV), maximum dose in % of dose prescribed at 2 cm from PTV (intermediate dose spillage location - ISL) compared to 3DCA. Investigation of FFF and FF energy modalities demonstrate that FFF plans have advantages in RTOG 0915 criteria over FF plans.

Results of all the plans point to VMAT-FFF as the optimal technique for lung SBRT treatments due to the high quality SBRT plans obtained.