FDG PET and Dual-Head Gamma Camera Positron Coincidence Detection Imaging of Suspected Malignancies and Brain Disorders

The purpose of the study was to compare the diagnostic accuracy of fluorodeoxyglucose (FDG) images obtained with a dual-head coincidence gamma camera (DHC) with those ob tained with a dedicated PET in a series of 26 patients. Methods: Nineteen patients with known or suspected malignancies and 7 patients with neurological disorders underwent PET imaging after injection of approximately 10 mCi of FDG. Whole-body imaging was performed on 19 patients and brain imaging on 7 patients. DHC images were then acquired for 30 min over the region of interest using a dual-head gamma camera equipped with %-in.-thick Nal(TI) crystals and parallel slit-hole collimators. The images were reconstructed in the normal mode, using photopeak/photopeak, photopeak/Compton and Compton/photo-peak coincidence events. Results: Although the spatial resolu tions of PET with a dedicated PET scanner and of DHC are in th