This study is being done to provide an alternative to bone scanning with technetium-99m (99mTc) labelled diphosphonates, and to document the safety of {18F}-Sodium Fluoride (Na18F) as a Positron Emission Tomography (PET) imaging radiopharmaceutical. Since the current availability of 99mTc was severely reduced because of the Chalk River shut down, alternative approaches to done scanning are needed. PET imaging with Na18F is one alternative approach to providing this critical clinical service.