FCH-PET scans performed prior to RT and then during RT showing treatment response. 1. Sixty-nine year old female with stage IIIB NSCLC, FCH-PET performed prior to RT, SUVmax 6.0 (A) and 3 weeks later, SUVmax of 5.1 (B). 2. Eighty-four year old with stage IV oropharyngeal cancer with FCH-PET SUVmax of 6.5 before RT (C) and 4.9 (D) after 4 weeks of RT. 3. Fifty-seven year old with hypopharynx cancer, with pre-RT FCH-PET SUVmax of 5.3 (E), and 4.4 after 3 weeks of RT (F). 4. Sixty-one year old female with stage III NCLC, showing a pre-RT FCH-PET SUVmax of 2.5 (G), and 4.3 after 4 weeks of RT (H). 5. Seventy-eight year old with un-resectable pancreatic cancer with pre-RT SUVmax of 6.0 (I), and 2.0 after 4 weeks of RT (J).