{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T13:56:20Z","timestamp":1780581380668,"version":"3.54.1"},"reference-count":53,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2002,2,13]],"date-time":"2002-02-13T00:00:00Z","timestamp":1013558400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Movement Disorders"],"published-print":{"date-parts":[[2002,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>It is often difficult to differentiate clinically between Parkinson's disease (PD), multiple system atrophy (MSA), and progressive supranuclear palsy (PSP).The objective of this work was to investigate whether combined pre\u2010 and postsynaptic dopaminergic single photon emission computed tomography (SPECT) scanning can reliably demonstrate changes in the nigrostriatal dopaminergic system and help differentiate between normal controls, PD, MSA, and PSP patients. We performed SPECT evaluation of the dopamine transporter (DAT) and dopamine D2 receptors (D2). SPECT scans using [<jats:sup>123<\/jats:sup>I]\u03b2\u2010CIT (for DAT) and [<jats:sup>123<\/jats:sup>I]IBF (for D2) were performed in 18 patients with PD (12 dopa\u2010na\u00efve and 6 <jats:italic>on<\/jats:italic> levodopa and\/or dopamine agonists), 7 with MSA of the striatonigral degeneration type, 6 with PSP, and 29 normal controls. Antiparkinsonian drugs were withheld for at least 12 hours before the scans. DAT and D2 binding potentials (Rv = <jats:italic>V<jats:sub>3<\/jats:sub>\/V<jats:sub>2<\/jats:sub><\/jats:italic>) were measured for caudate, anterior, and posterior putamen on the sides ipsilateral and contralateral to the worst motor symptoms. DAT binding in the posterior putamen was markedly reduced in all patients. However, D2 binding in posterior putamen was significantly increased in dopa\u2010untreated PD, being greater than the normal range in 4 of 12 (33%), and it was significantly reduced in MSA, being below the normal range in 5 of 7 (71%). None of the patients with PD showed reduced D2 binding below the normal range in posterior putamen. The degree of DAT binding could not discriminate between the patient groups. The ratio of posterior putamen to caudate percentage D2 <jats:italic>Rv<\/jats:italic> compared with the controls showed an opposite pattern between PD or PSP and MSA; the caudate was greater in 16 of 18 with PD and 6 of 6 with PSP, whereas caudate was less in 5 of 7 with MSA. These findings suggest that DAT SPECT may be useful in differentiating parkinsonism from controls and D2 SPECT in further differentiating MSA from Parkinson's disease and possibly PSP. \u00a9 2002 Movement Disorder Society.<\/jats:p>","DOI":"10.1002\/mds.10042","type":"journal-article","created":{"date-parts":[[2002,8,25]],"date-time":"2002-08-25T19:42:44Z","timestamp":1030304564000},"page":"303-312","source":"Crossref","is-referenced-by-count":159,"title":["Combination of dopamine transporter and D2 receptor SPECT in the diagnostic evaluation of PD, MSA, and PSP"],"prefix":"10.1002","volume":"17","author":[{"given":"Yun J.","family":"Kim","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Masanori","family":"Ichise","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James 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