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The goals of this clinical research are to evaluate the outcomes and tumor response for early stage non-small lung cancer (NSCLC) patients undergoing Stereotactic Body Radiation Therapy (SBRT) using four dimensional (4D) Positron Emission Tomography (PET) and Computed Tomography (CT), Cone-Beam Computed Tomography (CBCT), Real-Time Position Management (RPM™) and body immobilization system (see figure 1). Specifically, the effect of image-guided SBRT treatment on clinical tumor response rate, local control and progression-free survival will be studied. This study will examine target volumes and relevant margins determined by an assessment using 4D PET and repeated 4D CT. These data will allow us to evaluate and determine the impact of the body immobilization system on the planning target volume (PTV) margins, patient's breathing pattern, target motion, and inter-treatment targets shifts.