Fig. 2
a Dopamine transporter (DAT) scan (dopamine transporter single-photon emission computed tomography [SPECT] using 123I-Ioflupane) shows a clear hypo-accumulation in the bilateral striatum with specific binding ratios (SBR) of 2.46 and 2.85 on the right and left sides, respectively. The asymmetric index was 14.8%. b 123I-metaiodobenzylguanidine (MIBG) myocardial scintigraphy showed that the heart-to-mediastinum (H/M) ratio was 2.84 (normal > 2.2) and 3.29 (normal > 2.2) in the early and late phases, respectively. The washout ratio was 15.3% (normal < 30%), and there was no evidence of myocardial sympathetic nerve dysfunction