Divided target optimization with volumetric modulated arc therapy planning to improve target coverage and homogeneity in lung radiation therapy.

Purpose: To investigate and evaluate the feasibility of a simple modified Divided Planning Target Volume (DPTV) optimization method in radiation therapy planning of lung cancer patients.

Methods: A cohort of 15 patients of Non-Small Cell Lung Cancer (13 patients stage III and two patients of stage II) who were previously treated with Concurrent Chemo Radiation Therapy were included in the study. The planning modality was Volumetric Modulated Arc Therapy, and the dose prescription was 60 Gray in 30 fractions.