An<unk>  is a type of SPECT scintigraphy used to find carcinoid, pancreatic neuroendocrine tumors, and to localize sarcoidosis. It is also called somatostatin receptor scintigraphy (SRS).<unk> , a drug similar to somatostatin, is radiolabeled with indium-111, and is injected into a vein and travels through the bloodstream. The radioactive<unk>  attaches to tumor cells that have receptors for somatostatin (i.e. gastrinoma, glucagonoma, etc). A gamma camera detects the radioactive<unk> , and makes pictures showing where the tumor cells are in the body, typically by a SPECT technique. A technetium-99m based radiopharmaceutical kit is also available.<unk> ning is reported to have a sensitivity between 75% and 100% for detecting pancreatic neuroendocrine tumors. Instead of gamma-emitting 111In, certain<unk>  derivatives such as edotreotide (DOTATOC) or DOTATATE are able to be linked by chelation to positron-emitting isotopes such as gallium-68 and copper-64 which in turn can be evaluated with more precise (compared with SPECT) scanning techniques such as PET-CT. Thus, the<unk>  is now being replaced in most centers with gallium-68 DOTATATE and copper-64 DOTATATE scans. Somatostatin receptor imaging can now be performed with positron emission tomography (PET) which offers higher resolution and more rapid imaging.
Octreotide scan
GI cocktail
Secretin-cholecystokinin test
Electrogastrogram
Magnetogastrography
Upper gastrointestinal series
Gastric emptying scan
Acid perfusion test