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Representative DTI images of SN, Thal and HT in early PD patients with different numbers of SD types. Normal, healthy control; PD-SD0, PD patients with no SD; PD-SD1, with one type of SD; PD-SD2, with two types; PD-SD3, with three types; PD-SD4, with four types; SN, substantia nigra; Thal, thalamus; HT, hypothalamus.
