The investigational product will be administered to each qualified subject via a bolus injection (approximately 10 mCi will be administered for all subjects, except 20 mCi for the four subjects with a low probability of being positive for AD that are involved in the dosimetry analysis). This dose will not exceed 20 mCi, as the imaging time will extend out to approximately three hours. A larger dose (20 mCi) is needed in order to obtain quality images at the later time points.