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. 2024 Jul 4;23(4):242–249. doi: 10.1055/s-0044-1787995

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The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. ( https://creativecommons.org/licenses/by/4.0/ )

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 3 — Technetium-99m labeled tropane derivative (99mTc-TRODAT-1) single-photon emission computed tomography (SPECT) images of a patient with idiopathic Parkinson's disease (IPD) (Hoehn and Yahr [H&Y] 1.5). The transverse slices reveal asymmetrically reduced uptake in bilateral basal ganglia with more severe reduction in left putamen and relatively preserved uptake in right caudate nucleus, suggestive of reduced presynaptic dopaminergic activity. On semiquantitative evaluation, striatal uptake ratios (SURs) were 0.75 and 0.51 for the right and left striatum. These findings were concordant with disease lateralization.