Authors' Note: The new high-tech modality PET entails 'coincidence imaging' with positron emitters, such as fluorine-18, unusual drugs that give off two gamma-rays simultaneously in exactly opposite direction with each radiodecay event. In contrast, older technology with standard radiolabels, often designated by the initialism 'SPECT' (single-photon emission computed tomography) was used by imaging specialists such as our protagonist 'Dr. Specter'.
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