NCIt definition : The sulfate salt form of iobenguane, an iodine-131 labeled aralkylguanidine norepinephrine
analogue used as a diagnostic imaging tracer. Iobenguane is structurally related to
guanethidine and norepinephrine. This agent, functioning as a false substrate of norepinephrine,
is taken up and localized in the granules of pre-synaptic adrenergic neurons, thus
making this compound useful for the imaging of neuroendocrine tissues and tumors.;