Table 2.

Partial list of SPECT radiotracers

Target system or process		SPECT radiotracers
Cerebral Blood Flow		123I-iodoamphetamine (123I-IMP)
		99mTc-exametazime (99mTc-HMPAO)
		99mTc-ethyl cysteinate dimer (99mTc-ECD)
Cerebral plasma and red cell volume		99mTc human serum albumin
		99mTc red blood cells
Neuroreceptor Systems
Dopaminergic	D2 Dopamine receptors	123I-IBZM, 123I-epidepride
	D1 Dopamine receptors	123I-SCH23982
	Dopamine reuptake sites	123I-β-CIT
Benzodiazepine		123I-iomazenil
Cholinergic	muscarinic	123I-QNB, 123I-iododexetimide
Serotonergic	5-HT2A receptors	123I-R93274
Amino acid transport		123I-iodo-α-methyl tyrosine