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We also performed an [<jats:sup>99m<\/jats:sup>Tc]ethyl cysteinate dimer bicisate SPECT exam for regional brain network analysis in 9 ET, in a second group of 18 PD (9 with tremor, tPD and 9 akinetic\u2010rigid dominant, arPD) and in 8 HC. PD subjects had a reduced DAT binding in comparison to ET and HC with an annual decline rate of 7.3% in the contralateral putamen. There were no mean uptake differences between ET and HC at baseline and no uptake loss over time in ET. A discriminant analysis grouped 30% (first scan) and 5% (second scan) of ET as PD and a partition analysis showed overlap between ET and PD for caudate nucleus uptake. Spatial covariance analysis revealed that the expression of the PD\u2010related regional pattern separated both tPD and arPD from ET and HC. In conclusion, PD and ET do not share a common pattern of dopaminergic loss over time. However, mild impairment of dopamine transporter in the caudate nucleus may contribute to tremor onset in ET. \u00a9 2010 Movement Disorder Society<\/jats:p>","DOI":"10.1002\/mds.22870","type":"journal-article","created":{"date-parts":[[2010,3,29]],"date-time":"2010-03-29T15:56:12Z","timestamp":1269878172000},"page":"679-686","source":"Crossref","is-referenced-by-count":70,"title":["Imaging essential tremor"],"prefix":"10.1002","volume":"25","author":[{"given":"Ioannis 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