Answer: Hello there!
Ok, the choice is important because different radiopharmaceuticals will distribute in a different way in the body, this is because some parts of the body tend to need more of certain substances (also some tumors tend to use, for example, more glucose than the vicinity of cells, this means that if we add some radioisotope to the glucose, in the image the tumor will be brighter)
The radiopharmaceutical suministrated will depend on wich image is needed based on previous diagnostics.
