[PET Research in Clinical Oncology].

Positron emission tomography (PET) in nuclear medicine is especially used for diagnosis in clinical oncology, and PET/CT examination using 18F-FDG is very useful for staging and therapy evaluation of cancer. The excellent property of PET diagnosis is that the functional information of cells can be evaluated quantitatively, but it also has the problem that its quantitative value fluctuates depending on image reconstruction conditions and body movements/respiratory movements. In this paper, we summarize the PET research that has been conducted so far in clinical oncology, and also introduce our researches for improve the quantitativeness.