Assess the Variability of Uni-Dimensional, Bi-Dimensional, and Volumetric CT Scan Measurement of Non-Small Cell Lung Cancer Tumors

Patients with NSCLC undergoing non-contrast CT scan of the chest will have a second, high resolution, non-contrast CT scan of the chest performed on the same day. The scans will be performed on the same CT scanner, generally within 30 minutes. Unidimensional, bi-dimensional, and volume measurements for the primary NSCLC lesion will be determined on both scans and the values compared. After completing the second scan, the patient will have completed participation in the protocol.