Radiology All the given statements are true about PET scan except : A PET is a functional imaging method that allows metabolic scanning. B 18F-fluorine, 11 C-carbon, 13 N-nitrogen and 15 O-oxygen are positron emitters. C 18 FDG PET is is not entirely specific to malignant tissue. D Half life of 18 F-fluorine is 21 days. 💡 Explanation All the given statements are true about PET scan except : ✓ Correct Answer: D. Half life of 18 F-fluorine is 21 days.