Table 2.

Characteristics of the main PET radiotracers.

Radiotracer	Half-Life	Advantages	Disadvantages
15O-water	120 s	-High myocardial extraction fraction	-Limited application to facilities with an on-site cyclotron
82Rubidium	76 s	-Not requiring a cyclotron on site	-Significant roll-off at high flows -Low myocardial extraction fraction
13N-ammonia	10 min	-High myocardial extraction fraction	-Requiring a cyclotron on site
18F-labeled agents	variable	-Flow-independent high extraction fraction (>90%)	-Alterations in the metabolic state of the myocardium may affect its retention -Current use only in investigational trials