What is the principle of positron emission tomography (PET)? What are its applications?

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The principle of PET is that radiation emitted from a radiopharmaceutical injected intravenously into a patient is registered by external detectors positioned at different orientations.
Applications: PET is a powerful imaging technique which enables in-vivo examination of brain functions. It allows non-invasive quantification of cerebral blood flow, metabolism and receptor and its binding

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