The characteristic feature of nuclear medicine is that it provides functional images of organs, tissues and both normal and pathological processes, revealing the uptake and the biodistribution of several radiopharmaceuticals according to their pathway of flux, concentration and metabolism. There is a strong relationship between nuclear medicine and oncology since in general nuclear medicine images are able to give both morphological information and data on molecular and cellular activity. The major advantages of this functional imaging are that this biological characterization is carried out by the direct observation in vivo of the patient (Bombardieri et al. 1999).
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