Hi,
For initial staging a CT scan is standard. If the CT scan did not show up clearly enough for some reason, an MRI might get ordered and sometimes a PET. PET's are not used standardly yet, insurance will cover it but only after other tests don't give a clear enough answer. If someone is being treated with chemo for invasive bladder cancer a PET is more likely to be ordered (and covered).
It depends on the original diagnosis whether a doctor will think a PET is needed. Do you know the stage and grade of the tumors removed, was there CIS found?
There's more info here about staging:
blcwebcafe.org/staging.asp
Take care,
Wendy