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Diagnostic inaccuracy contributes to suboptimal clinical outcomes. Therefore, clinically accessible biomarkers are warranted to support differential diagnosis in routine practice.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>The aim was to develop a multimodal imaging model combining T1\u2010weighted (T1W) volumetry, quantitative susceptibility mapping, and neuromelanin (NM) magnetic resonance imaging (MRI) for distinguishing PD from MSA subtypes.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>A total of 387 participants were analyzed, comprising 141 with PD, 86 with MSA (51 cerebellar variant [MSA\u2010C], 35 MSA\u2010P), and 160 age\u2010 and sex\u2010matched healthy controls. Group comparisons were performed for brain volumetry, susceptibility in deep gray matter, spatial heterogeneity of putaminal iron, NM content in the substantia nigra pars compacta (SNpc), and locus coeruleus (LC). Classification was conducted using a Gaussian Na\u00efve Bayes classifier with fivefold cross\u2010validation.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Compared with PD and controls, (1) corrected volumes of the brainstem, bilateral cerebellar white matter, and gray matter were significantly reduced in MSA\u2010C and MSA\u2010P, (2) susceptibility was increased in the bilateral putamen in MSA\u2010P and in the bilateral dentate nucleus in MSA\u2010C, and (3) NM contrast was reduced in the bilateral SNpc in MSA\u2010P and in the bilateral LC in MSA\u2010C. The multimodal models yielded area under the curve values of 0.967 (PD vs. MSA\u2010C), 0.884 (PD vs. MSA\u2010P), and 0.879 (PD vs. MSA\u2010P vs. MSA\u2010C).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Integration of volumetric, susceptibility, and NM measures with machine learning enables accurate differentiation of PD from MSA subtypes, which provides a potential means to differentiate parkinsonism in clinical practice. \u00a9 2025 International Parkinson and Movement Disorder Society.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/mds.70153","type":"journal-article","created":{"date-parts":[[2025,12,30]],"date-time":"2025-12-30T09:35:47Z","timestamp":1767087347000},"page":"750-760","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Integration of Volumetric, Iron, and Neuromelanin 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