along with conventional pharmaceutical carriers and excipients appropriate for the type of administration contemplated for example parenteral formulations advantageously contain the inventive agent in a sterile aqueous solution or suspension parenteral compositions may be injected directly or mixed with a large volume parenteral composition for systemic administration such solutions also may contain pharmaceutically acceptable buffers and optionally electrolytes such as sodium chloride formulations for enteral administration may vary widely as is well known in the art in general such formulations are liquids which include an effective amount of the inventive agent in aqueous solution or suspension such enteral compositions may optionally include buffers surfactants thixotropic agents and the like compositions for oral administration may also contain flavoring agents and other ingredients for enhancing their organoleptic qualities the compositions are administered in doses effective to achieve the desired effect or result the dosage of the tracers may vary according to the clinical procedure contemplated and generally ranges from 1 picomolar to 100 millimolar the compositions may be administered to a patient typically a warm blooded animal either systemically or locally to the organ or tissue to be imaged and the patient then subject to the imaging procedure the tracers may be administered to the patient by any suitable method including intravenous intraperitoneal or subcutaneous injection or infusion oral administration.