Fig. 3: Oscillations assessed by inertial sensors are associated with higher Caudate Binding Ratio. | npj Parkinson's Disease

Fig. 3: Oscillations assessed by inertial sensors are associated with higher Caudate Binding Ratio.

From: Relative sparing of dopaminergic terminals in the caudate nucleus is a feature of rest tremor in Parkinson’s disease

Fig. 3

A Champalimaud Clinical Centre DaT-SPECT images were classified into positive (evidence of dopamine denervation) or negative (no evidence of dopamine denervation) based on standard clinical criteria. B Inertial sensor placement and orientation in patients’ lower back. Example of triaxial acceleration, along with the schematic representation of the signal pre-processing pipeline and extraction of the maximum spectral power between 4 and 6 Hz, with an example of the Welch power spectral density (bottom). C Left, Welch power spectrum (normalized to the mean power between 1 and 3 Hz) for the PD (blue) and Control (green) groups. Right, Comparison of the log of the maximum power spectrum. D Left, Welch power spectrum (normalized to the mean power between 1 and 3 Hz) for the Positive (red) and Negative (grey) groups. Right, Comparison of the log of maximum power spectral density in the 4–6 Hz band between the Positive and Negative groups. E log of maximum power spectral density (4–6 Hz) vs. Rest (left) and Action (right) tremor scores for PD, the Positive and Negative groups.

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