Fig. 3From: The chemical tool-kit for molecular imaging with radionuclides in the age of targeted and immune therapyRadiotracers based on glucose structure (line diagrams and space-filling representations) comparing labelling with 18F (via C-F bond, in the form of fluorodeoxyglucose, FDG) (top); and with 99mTc (via bifunctional chelator as exemplar radiometal conjugate). The large size of the 99mTc complex makes it an unlikely substrate for GLUT-1 or hexokinaseBack to article page