With each scan, the patient will receive a single IV injection of FDG. Initial imaging will be conducted 60 minutes after an average injection of 200-300 MBq of FDG (dose is dependent on which scanner is used and patients' weight). The images will then be examined by an experienced nuclear medicine physician and the location and intensity of abnormal FDG uptake will be reported. The referring physician will then correlate the findings with the results of clinical examinations and conventional imaging.