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. 2012 Jul 23;1(2):146–151.

Figure 1.

Figure 1

Representative cases of 123I-MIBG myocardial scintigraphy. A: normal control (the HM ratio 2.84), B: Case 2 of 13 amnestic mild cognitive impairment cases (the HM ratio 1.41). MIBG: metaiodobenzylguanidine; The HM ratio: the heart to mediastinum ratio; The cut-off value of delayed MIBG images (4 hours after injection of 111 MBq MIBG, depending on uptake-1 [neuronal uptake], reflecting cardiac sympathetic nerve activity) of the HM ratio was 2.0. Reduced HM ratio indicates peripheral noradrenergic depletion.