Inclusion Criteria:  Age 18 or older Ability to provide informed consent Histologically confirmed non-small cell carcinoma of the lung Patient to receive standard RT with curative intent with or without concurrent or sequential CHT according to the institutional protocol ECOG performance status 0-1 within one month of accrual Negative pregnancy test within one month of accrual if woman is premenopausal Patient presented at multidisciplinary tumor board or quality-assurance rounds Satisfactory pulmonary function tests, i.e., forced expiratory volume during the first second (FEV1) ≥ 1.0 l (≥40%)  Exclusion Criteria:  Noncompliance with any of the inclusion criteria Pregnancy Prior RT to the thorax Patient to receive stereotactic body radiation therapy (SBRT)