patients with suspected or biopsy proven NET will undergo imaging using a Combination of 18F- FDG , 18F-DOPA and 68Ga-DOTATATE PET/CT before the stat of PRRT . after two cycles of treatment another two PET/CT are done using 18F- FDG and 18F-DOPA and about 6-8 weeks from last treatment the patient will undergo PET/CT using 18F-DOPA .
the investigators will follow up after patients with neuroendocrine tumors who undergo PRRT treatment and evaluate the response for treatment using PET/CT with different tracers