NCIt definition : A radiopharmaceutical containing the dopamine D2/D3 receptor agonist iodobenzamide
(IBZM) labeled with the radionuclide iodine I 123 with dopamine receptor-binding and
radioisotopic activities. Upon administration, iodine I 123 iodobenzamide binds to
dopamine D2/D3 receptors; subsequently, tissues expressing these receptors can be
visualized using single photon emission computed tomography (SPECT). Dopamine receptors
are a class of metabotropic G protein-coupled receptors found in the central nervous
system (CNS) and neuroendocrine tumors such as pheochromocytoma and paraganglioma.;